SIGMA Complete Catalogue [2010]

Sigma Instruments Company is in the business ofdesign & development, manufacturing and supply of Tank Level & Flow Instrumentation products. Established in 1973, Sigma draws its inspiration from theeighteenth letter in the Greek alphabets, used todenote the algebraic sum total. The purpose is toserve the industry by recognizing and providing asum total of fluid monitoring devices and allied instrumentation products to its customers.

The products can be broadly classified into

Sigma's Operation and processes are managedon principles of ISO 9001:2008 Quality Management System. The products also come with IBR Approvaland CE Mark. Recognition & approval of our productsby leading domestic and international companies / consultants and repeat orders from our customers,fuel our passion to go that extra mile in delivering thereliable gaging & control, needed for Tank Level &Flow Instrumentation Products.

- Level Gauges Level Switches

- Level Indicator - Sight Glasses

- Flow Switches

- Allied Instrumentation Products.

-

Sigma Instruments Company is Committed to:

- Provide reliable products to the customer based on engineering principleswith desired quality and service, creating confidence for repeat requirements.

- Practice and maintain highest corporate ethics of Honesty & Integrity with Suppliers,Customers, Associates and Co-workers.

- Foster a culture where training is an integral part to continually improve the processes.

Tank Level & Flow Instrumentation Products

Sigmas products find applicationin wide spectrum of industries like:

- Chemical, Petrochemical, Pharmacy & Refineries

- Power Plants

- Process

- Oil & Gas Exploration, Storage & Transport

- Machinery

- Water and Waste Water Treatment

- Environmental Technology

- Food and Beverage Industry

- Fire Fighting Systems

Some of our Patrons . . .

[email protected]

I N D E X

Level GaugeArmored Level Gauge (Reflex / Transparent) 03-07

Magnetic Level Gauge 08-09

Tubular Level Gauge 10-11

Oil Level Gauge 12

Tank Level IndicatorFloat Level Indicator 13-15

Automatic Tank Level Gauge 16-19

Level SwitchSide Mounted Level Switch 20-21

External Cage Level Switch 22-23

Top Mounted Level Switch 24-25

Level Switch (REED) Type 26-27

Conductivity Level Switch 28-29

Pneumatic Level Switch 30

Transmitter 31

Sight Flow Indicator 32-33

Flow Switch 34-35

Allied ProductsCondensate Pot 36-37

Manifolds 38

Instrumentation Fittings 39

Needle Valve 40

Custom Products 41

Level Switch-Cable Float 42

Disclaimer: All the products mentioned in this catalogue are our standard

design. If the standard products do not meet your requirements, we

can modify them to meet your specifications and would appreciate the

opportunity of making suggestions to cover your application, based

on engineering principles. SIGMA reserves the right to modify

specification / design from time to time, which is deemed suitable

for the product without prior intimation.


SIGMA INSTRUMENTS COMPANY Office: 201, Anandraj Industrial Estate

Sonapur Lane, Bhandup (W), Mumbai 400078. INDIA. | Tel.: +91 22 2566 0555

Fax: +91 22-2566 3285 | | www.sigmainstruments.co.in [email protected]

Works: 27, Nahur Udyog Indl Permises, M. M. Malaviya Road, Mulund(W), Mumbai - 400080. INDIA . | Tel. : +91 22 2591 8567 | Fax : +91 22 2591 8566

FLAT GLASS GAUGE (ARMORED)

Sigma Advant-edge

Maintenance free rugged design.

Material mix to suit specific application.

Special design for high temperature and pressures.

Customized process connections, center to center distance

and visible length.

Safety ball check device in gauge valves prevents leakage in the

event of glass breakage.

Choice of Off set Gauge Valve in the top and bottom connection,

facilitate cleaning of solid chamber.

Leakage indicating gauge construction for Nuclear Power Plant

applications.

TUV India Private Ltd.

IBR ApprovedFlat Glass Gauge

Availabl

e

SIGMAs Flat Glass Level Gauges are reliable means for accurate measurement and direct observation of process fluids.

These are designed to match industry requirements of ruggedness and material mix to widen the scope of application in

process tank, pressure vessels and other containers with fluids varying from ordinary water to highly corrosive chemicals.

THE SYSTEM: The Flat Gauges are inevitable means for process fluid measurement when it comes to severity of

conditions. The medium to be measured is made available for direct measurement outside the vessel without any

special preparations and provides on line monitoring. The principle of liquid maintaining the same level makes this

system very precise and reliable. The fluid attains its level in the chamber of the level gauge as that of the vessel and is

viewed through a glass window. SIGMA Gauge Valves form a major component of the flat glass gauges. Two gauge

valves at the ends of the gauge chamber are connected to the tank. Under normal operations, the valves are kept

wide open causing the pressure to equalize in the system thus permitting the liquid to seek its true level for observation

along the visible length. SIGMA offers Reflex and Transparent type Flat Level Gauges as required by the industry.






Sigma Reflex Level Gauge

Sigma Transparent Level Gauge

Making the choice

Gauge Construction

TRANSPARENT TYPEREFLEX TYPE

STUDU BOLT

NUTSPRINGWASHER

COVER PLATE

CUSHION GASKET

SEAL GASKET

GLASS

MAIN CHAMBER

The Reflex Level Gauge consists of a chamber designed to have one

or more front windows i.e on one side of the chamber. Each window

consists of a special glass called reflex glass that is cushioned

between cover plates and chamber . The reflex glasses are provided

with prismatic grooves on the side in contact with the medium. As a

result of the difference in refractive index, light rays entering the gauge

from outside are reflected or absorbed. The light rays entering the 0steam or gas space strikes the grooves face at an angle of 45 C,

thereby being refracted into the opposite groove face from which it is

reflected back to the direction of observation. The steam or gas space

appears silver while and the liquid space appears black. This

eliminates any possibility of error in reading the liquid level The Reflex

Level Gauge does not require an illuminator.

The Transparent Level Gauge consists of one or more windows on

each side of the liquid chamber. The transparent glasses are crystal

clear and have very smooth surfaces. The glasses are cushioned with

gaskets, between cover plates and the chamber. Sigma large

chamber reflex and transparent level gauges are designed to give a

more accurate reading for liquids that have a tendency to surge or

boil, that cannot not be obtained with the standard gauges.

SIGMA Reflex Level Gauge is recommended for clean, colorless and

non viscous services. Sticky fluids tend to coat the glass and result in

wrong readings, Erroneous indications will also occur if fluid is near

saturation conditions or when the boiling or condensation in gauge

glass affects the refraction of light through the prisms.

SIGMA Transparent Level Gauge is recommended for colored or

viscous fluids, interface detection and direct observation of the

physical state. A source of light can be provided by a illuminator which

is located at the back of the gauges, enabling readings of the liquid /

steam interface. Quick closing of the gauge valve feature allows the

needle to plug the seat very quickly and seal off the process.






WELD PAD FLAT GLASS LEVEL GAUGE

The System

WELD PAD Flat Glass Liquid Level Gages are designed to become an integral part of the vessel, Weld pad liquid Level Gages are directly mounted to the tank or vessel to be measured.

SIGMA Welding Pad Gages are used where conventional gage and valve construction is impractical because of solid matter in suspension, under conditions where the thermal error caused by piping to a gage glass cannot be tolerated or where space requirements suggest their use. Included are applications involving high vibration, highly viscous liquids or liquids with considerable amounts of solids. SIGMA offers end users a flat or radius weld pad gage in varying lengths and configurations. It is possible to monitor color, clarity and level of a gas / liquid interface. Because there are no nipples through which the process liquid enters the gage, clogging potential is eliminated.

SIGMA Welding Pad Gages are made in both Reflex and Transparent Types. Reflex gages are used where liquid reading only is required. Transparent gages are usualy used where installation is made on each side of the vessel to give see-through visibility.

SIGMA weld pad gages comprise of six basic components. Each component may vary slightly, depending on the desired physical and mechanical properties for the gage. refer picture:

1. Chamber - provides a pressure retaining metallic surface for weld attachment tothe tank or vessel. Vessel chamber surface can be radiused to match tank orvessel curvature. Slot(s) are machined into the chamber to provide directvisualization of the process fluid.

2. Gasket - seal the gap and prevent leakage between the chamber and the glass.Gaskets are available in a variety of materials for compatibility with the media inthe gage.

3. Cushion - acts as a protective buffer between the glass and the cover. For propersealing, cushions must be as hard or harder than the gasket material.

4. Cover - protects the glass assembly from external hits and provides a flat, rigidsurface that is used to evenly compress the gage assembly.

5. Bolting - compresses the components between the covers & weld pad chamber.

Mica Shield - (Optional on transparent gages) used to prevent the process media from contacting the glass.

Load Consideration: Whenever it is necessary to slot the tank because of the nature of the liquid or there is need to observe the color or interface of the liquid, the following facts must be considered: Standard and welding pad gages will withstand a loading due to the pressure within the gage itself, but they are not designed to replace the tank strength lost with tank wall is cut. SIGMA has no control over the loading in which the pressure vessel will impose on the pad. It is therefore impossible to rate welding pad gages. The tank fabricator must provide suitable tank wall reinforcement to prevent the pad from being distorted during welding or while under hot operating condition.






Gauge Construction

Type : Reflex / Transparent.

Liquid Chamber : Carbon Steel, Rubber / Teflon lined SS 304,

SS 316, SS 304L, PVC / PP / Monel /

Alloy 20 / specified.

Cover Plate : CS, SS 304, SS 316, Aluminum, PVC /

PP / Specified.

Bolt & Nuts : ASTM 193 Gr.B7 / A194 Gr.2H / specified,

evenly spaced to give uniform pressure

Glass : Toughened borosilicate, Alumina silicate for

specific liquids, Oil tempered and Soda

Lima Glasses (optional)

Make : Toughened Borosilicate / Indigenous

Gasket : Non Asbestos / Teflon / Klingerite / Grafoil

/ specified.

Gauge Valves : Auto Shut off / Straight / Off set with ball

check arrangement.

Bonnet : Screwed / Bolted

Connections : Flanged and Screwed (as required). Top

and Bottom. Side Connections are

available. Chamber to Valve can be union

or welded. Flanged Ends can be made

rotatable or even spherical union

connections can be provided.0 0Temperature : Borosilicate up to 300 C and 50 C

PVC / PP Level Gauges.

Pressure : 20 tp 250 bar / specified.

Shield : Mica / PCTFE

1. Drain cocks are supplied fo all gauge glasses with material same

as that of valve body having 1/4" NPT connection as standard.

Plugs for Vent is standard and drain cocks are provided wherever

called for.

2. Illuminators are of weather proof & explosion proof type giving an

even diffusion of light over the entire lengths of gauge glass

without glare or blind spots. Scales are available where positive

measurement of liquid is required. Scales are offered in Aluminum

/ SS / weather resistant plastic, graduated in mm / inches.

3. Internal cooling tube, Expansion coil, Balancing pipe or

Frost shields (for very low temperature) or any other special

requirements are available as optionals.

Off Set Valves: Having an advantage of permitting the inside of

the gauge glass to be cleaned easily with minimum disassembly,

by removing vent and drain plugs (or other connection), a straight

passage through the chamber is obtained.

A soft brush or water jet is an ideal way to clean. This is possible

because the spindle is away from the center and does not block

the path of cleaning.

Auto Shut Off: This safety device blocks off fluids from being floored

outside of the tank in the event of glass breakage. Both the upper

and lower valves come equipped with this feature called ball check.

Upon glass breakage, a ball that is floating in normal condition, get

drawn by the surge of the fluid to spill out of the broken section.

This ball then plugs the valve seat and seals off the fluid flow.

Closing of the valve stem plugs the seat and also dislodges the ball

from the other end of the seat.

Gauge Connection: Welded construction is opted when viewing is

predetermined and when rotation of the main chamber is not

required. Valve connection to the main chamber can be provided

with union threaded connection to facilitate disassembly for cleaning

or for turning the chamber to the desired angle of visibility. This is

however possible for top and bottom valve mounting option only.

While ordering please specify:

Type of valve, center to center distances, opening conditions, body

material, connection size & type. Special type of gauge glasses as

per customer's requirement can be supplied.

Bolted BonnetGauge Valve

Screwed BonnetGauge Valve

Note

All the Flat Glass Gauge mentioned in this catalogue are our

standard design. If the standard items do not meet your

requirements, we can modify them to meet your specifications and

would appreciate the opportunity of making suggestions to cover

your application, based on engineering principles. SIGMA reserves

the right to modify specification / design from time to time, which

is deemed suitable for the product without prior intimation.






Model Decoding example: ARLG-S-S-O-S-F-1-4-F-1200 mm

Armored Reflex Level Gauge, with2- Standard design - Operating pressure up to 15 kg/cm

- Side-Side Orientation - Valve / Flange Material - SS 304

- Off Set Valve Body - with Frost Shield

- Screwed Bonnet - CC : 1200 mm

- Flanged Connection

- Auto shut off valve are un lined / uncoated by virtue of design. In case valves are not opted in lined chambers,

isolation valves may be provided for maintenance.

- Lined / Coated versions are available in large chamber model only by virtue of design.

- Lined / Coated level gauges shall have Flanged process connection only.

- Model Coding is categorized as per the specification of the product, for ease of selection and ordering.

- In case of choosing multiple specification under a specific category, mention the 2nd / 3rd code with a bracket, after the 1st code.

For ordering IBR approved product, mention "IBR" immediately after the Product code.

- The product conforms to 97/23/EC: Pressure Equipment Directive, Article 3.3 Sound Engineering Practice.

- In case of doubt, contact SIGMA for assistance in arriving at the model code / for specification.

Model Number Coding for Armored Level Gauge

TypeARLG - ReflexATLG - Transparent

DesignS - StandardL - Large ChamberU - Uninterrupted visibilityW - Weld Pad

OrientationS - Side-SideB - Top and Bottom

Valve BodyO - OffsetT - StraightN - No Valve

BonnetS - ScrewedB - BoltedN - No Bonnet

ConnectionF - FlangedT - ThreadedS - Socket WeldB Butt Weld

Operating pressure21 - up to 15 kg/cm22 - up to 40 kg/cm23 - up to 80 kg/cm

S - Specified

Valve / Flange Material4 - SS 304 V - PVC 5 - A 105 6L - SS 316L T - Teflon6 - SS 316 P - PP S - Specified

4L - SS 304L

Special FeaturesN - NoneF - Frost Shield R - Rubber LinedM - Mica Shield C - Internal Cooling I - FP Illuminator TubeT - Teflon Lined

E - Expansion Loop

CC in mm Example 1200 mm

Note






MAGNETIC LEVEL GAUGE

Specifications Extruded Outlet

(Optional)

No sink-in distortion for

interference float travel.

SIGMA's Magnetic Level Gauge's operation is based on elementary

principles of physics:

- Liquid attains the same level in communicating vessels.

- Unlike magnetic poles attract and like poles repel.

- Last but not the least, Archimedes principle.

Sigma Magnetic level gauge consists of :

A vertical chamber consisting of a non magnetic tube of suitable

diameter and thickness

A float, where-in magnets are placed radially exactly on the

liquid level line (floating point)

Two horizontal stub pipes with specified end connection

An indicator outside the vertical chamber comprising of a set of flags

that contain a set of permanent magnet encapsulated, which can rotate

on their horizontal axis or a magnetic follower that moves along

in a transparent tube.

Optional shut off valves at the two stub pipes to isolate the level gauge

A non magnetic scale with graduations in mm/cm/inches

As the float moves up and down with changing level,

the following action takes place:

- In case of the flag type, the flag indicator consists of bicolored flags that

are contrasting dark and bright colors. The bright represents the liquid

level and the dark color depicts the empty or interface fluid level.

The float immerses only on the upper fluid and floats on the lower for

which the specific gravity suitability is maintained.

- In case of the follower type, the indicator consists of a encapsulated

magnetic follower that follows the rise and fall of the magnetic float.

Specific Gravity : 0.6 upwards / specified.0 2 Temperature : 200 C, Pressure: 10-80 kg/cm

High Pressure / High Temperature option available

Process Connection : Threaded / Flanged

Chamber Material : SS304 / SS316 / PVC / PP / PVDF / HDPE / Coated / Lined / Specified

Float : SS304 / SS316 / Titanium / Specified

Optional : Shut Off Valve, Insulation Jacket, Transmitters, Level Switch

Consult SIGMA to check suitability of Gauge for process condition.






Note

All the Magnetic Level Gauge mentioned in this catalogue are our








IBR ApprovedMagnetic Level Gauge

Availabl

e

- Acid Tanks - Fertilizers and Pesticides

- Ammonia Tanks - Fuels and Solvents

- Boiler Feed Water Tanks - Oil Production and refining

- Detergents and Soaps - Scrubber & Storage Tank

Application Areas of Magnetic Level Gauge

Model Decoding example: MLG-S-F-4-S(T)-1200 mm

Magnetic Level Gauge, with

- Side - Side Orientation - With Level Switch and Transmitter

- Flanged Connection (specify the Flange rating and size while ordering) - CC: 1200 mm

- Material of construction - SS304

- Model Coding is categorized as per the specification of product, for ease of selection & ordering.


- For ordering IBR approved product, mention "IBR" immediately after the Product code.

- The product conforms to 97/23/EC: Pressure Equipment Directive, Article 3.3 Sound Engineering

practice and 2006/95/EC: Low Voltage Directive (LVD)


Note

Model Number Coding for Magnetic Level Gauge

MLG

Magnetic Level

Gauge

Orientation

S - Side SideT - Top

Mounting

Material ofConstruction

4-SS304

6-SS3164L-SS304L

6L-SS316LP-PP

V-PVC

S-SpecifiedMaterial

CC (in mm)

Example 1200 mm

Connection

F- FlangedT- Threaded

S-SocketWeld

B-Butt Weld

AdditionalFeatures

N-NoneI -

Insulation Pad

S - Level Switch T - TransmitterJ - Jacketed

Type

T - Teflon Coating

V -Valves






TUBULAR LEVEL GAUGE

Sigma Advant-edge

Maintenance free rugged design.

Material mix to suit specific application.

Special design for high temperature and pressures.

Customized process connections, center to center distance

and visible length

Safety ball check device in gauge valves prevents leakage in the

event of glass breakage

Choice of Off set Gauge Valve in the top and bottom connection,

facilitate cleaning of the Glass tube

Center to Center (C/C) : as per below table / specific design

Body Type : Straight or Off set

Body Material : SS304 /SS 316 /CS /PP /PVC /specified

Connection : Screwed / Flanged

Glass Tube : Borosilicate ( 16 / 19 / 25 mm)

Protector : Guard Rod (4 Nos) / 'C' Cover (2 Nos)

Hand Wheel : Bakelite / CI

Drain / Vent : Plugs or Cocks in BSP / NPT

Accessories : Scales are available for positive

measurement of liquid is required. Scales are offered in weather

resistant Plastic / Aluminum / SS and graduated in mm / inch.

Specifications

Maximum Working Pressure for Gauge Glasses

3025201611554

Recommended Length in mm

250500750

10001250150017502000

Pressure 2in kg/cm

SIGMA's direct reading liquid level gauge glasses are the recognized reliable means of accurately determining the liquid

level in process tanks, pressure vessels, boilers & various other types of containers with liquid varying from ordinary

water to highly corrosive and dangerous chemicals.

The principle of liquid maintaining the same level makes thissystem very precise and reliable. The fluid attains its level in theglass tube of the level gauge as that of the vessel and is viewed through the glass tube. SIGMA Gauge Valves form a major component of the tubular glass gauges. Two gauge valves atthe ends of the glass tube are connected to the tank. Undernormal operations, the valves are kept wide open causing the pressure to equalize in the system thus permitting the liquid toseek its true level for observation along the visible length.

Operating Principle

Model Number Coding for Tubular Level Gauge






Note

All the Tubular Level Gauge mentioned in this catalogue are our








IBR ApprovedTubular Level Gauge

Availabl

e

Model Decoding example: TLG - O - B - F - 4 - 2 - G-25 NB 150 #-1200 mm

Tubular Level Gauge, with

- Offset Valve Body

- Bolted Bonnet

- Flanged Connection

- S3 304 Flange / Valve

- 16 mm Glass OD

- Guard Rods for Glass Protection

- Flange Size 25 NB Size, 150 #

- CC: 1250 mm




- Bolted Bonnet option is only available in Offset Valves (CS/SS).

- The product conforms to 97/23/EC: Pressure Equipment Directive, Article 3.3 Sound Engineering Practice.


TLG

Tubular Level

Gauge

Bonnet

S - Screwed

B - BoltedN - None

Connection

F-FlangedT- Threaded

S-SocketWeld

B-Butt Weld

Flanges / Valve Material

4-SS3045-A105

6-SS3164L-SS304L6L-SS316L

P-PPV-PVCT-Teflon

S-SpecifiedMaterial

C/C in mm

Example 1250 mm

Glass OD

1- 12 mm2- 16 mm3- 19 mm4- 25 mm

Glass Protection

G - Guard Rods

C - Cover Protector

Connection Size & Rating

SR-Specify size & Rating for

example 25 NB 150 # or 40 NB SWor 20 NB NPT

ValveBody

O - OffsetT - Straight

N - No Valve

Note






OIL LEVEL GAUGE

S - Others specify

ProcessConnection

1 - M12 2 - M8

Model Number Coding for Oil Level Gauge

SIOLG

Sigma Oil Level Gauge

No.of Limb

S - Single

D - Double

Indication

A-AcrylicG- Glass

Wetted Parts

4-SS3046-SS316

C-CS

Specify C/C (mm) distance after the model code.

Note:

- SIGMA reserves the right to modify specification / design

from time to time, which is deemed suitable for the product

without prior intimation.


Sigma Advant-edge

No Glass Tube Construction for breakage

No Leaking glands and gland tightening for glass packing.

Comparatively unbreakable on slight impact.

Clear and easily cleanable.

Typical Application of Oil Level Indicator

Machinery

Gear Boxes Hydraulic Tanks0 Engine Tanks (Temperature below 60 C)

Bearing Housings

Wetted parts : CS / SS 304 / SS 316.

Process Connection : M12 or M8 (Banjo Bolts).

Lock Nut : CS / SS.

Guard : CS, Slotted Tube.

Gauge : Toughened borosilicate 16 mm.

Banjo Bolt O Ring : Neoprene / Viton.

Range (C/C) / Visibility : 75 to 300 mm / c/c - 40 mm.0 0Temperature / Pressure : 70 C (Neoprene),100 C (Viton) / 1 bar.

Specifications

25

c/c

25

Oil Level Gauge(Acrylic )

Oil Level Gauge (Glass)

SIGMAs Oil Level Gauge / Indicators (Acrylic) are designed

for measuring / indication of level of oil or other transmission

liquids. The principle of operation is liquid maintaining its

level by virtue of gravity. The Oil Level Gauge comprises

of a solid block of transparent acrylic (oil chamber) with

graduations as required. The Oil Level Gauge is connected

to the storage tank through a single limb or by having two

connections drawn from the chamber to the side of the tank.

It also contains a vent and a drain. This is typically used for

low pressure and low temperature applications.

SIGMAs Oil Level Gauge / Indicators (Glass) is rugged,

compact and reliable gauge for visual indication of oil

levels in small tanks.

The Level Gauge consists of a toughened borosilicate

gauge glass tube fitted between metallic end blocks and

banjo bolts through a set of o-rings. A slotted steel guard

is provided enclosing the glass guage to provide protection

from accidental damage. The gauge is mounted parallel

to the tank, to form a closed loop causing tank liquid to

seek its level in the gauge.






FLOAT LEVEL INDICATOR

Sigma Advant-edge

Specifications

Simple and rugged in construction.

Good readability from a long distance.

Easy installation.

Can accommodate a range of specific gravities.

For larger ranges and minimum mounting space,

the Half scale type is a classic solution.

Liquid seals for volatile and fuming processes.

090 Elbow withpulley

0180 Elbow withpulley

Sealant Filling

Drain

mm WC Volume ofSealant Required

200300600

1000 ml1200 ml1900 ml

SIGMA tank level indicators are float operated target type suitable for liquid level gauging of fixed roof, floating roof,

open type vertical storage tanks and underground sumps for water, oil, solvents etc. The tank level indicators are of

simple construction and are easy to install. They are very sturdy and require no maintenance. A float operated tank indicator

comprises of a float that is located within guide cables. The guide cables whose ends are fastened on to an anchor bar

are kept straight and wrinkle free by tension devices. The anchor bar is either grouted or welded to the tank bases.

The float cable is wound over a set of pulleys, which are secured in the pulley housing. One end of the float cable

bears the float and the other end carries a pointer assembly with a counter weight for balance. Tank level indicator float

operated type is for fixed roof, floating roof, open top and under ground storage tanks.

Liquid seals are used for application where

Product stored is volatile Inert gas blanketing in tank

Vapor pressure is in excess but less than above listed mm of

Water column Approximate volume of sealing liquid is

produced in the table.

Note: Transformer oil / liquid paraffin is provided if required.

Type & Range : Full Scale / Half Scale,

up to 20 m / specified

Graduation : At every 100 mm in Nylon / PP.

Specific Gravity : 0.7 and above.0Operating Temperature : up to 300 C / specified

Float : SS 304/SS 316/ MS Rubber Lined

/SS316 Teflon lined/PP/PVC/ specified

Guide Wire : SS 304 / SS 316 / Nylon / PP /

Specified.

Tension Spring Assembly : Carbon Steel / SS 304 / SS 316.

Anchor Bar : CS / SS 304 / SS 316 / Specified.

Pulley : SS 304 / SS 316 / Brass /

Aluminum / Specified

Pulley Housing : AL / CI / SS.

Guide Tube : CS / SS.

Scale : Aluminum.

Pointer : AL / SS.

Counter weight : CI / SS.







FLOAT LEVEL INDICATOR WITH LEVEL SWITCH

Specifications

Sigma Advant-edge Mounting Arrangementof Floating Roof Tank

Float WireAttached to Pointer

Scale Board

PONTOON

Float Level Indicator with Level Switch

Counter Weight

Pointer

Pull Chain

Side MountedLevel Switch

Scale Board

Float Wire

Graduations

The various advantages of the float level indicator is to provide continuous liquid level measurement for bulk storage

applications is further enhanced by the addition of level control. SIGMA float level indicator cum switch is specifically

engineered to reduce maintenance and enhance reliability. FLI with Level Switch is the best solution in critical areas

where it is not possible to use Level Switches in the inside of the tank. Typical application area includes Floating Roof

Tanks, Underground Sumps where switching is not possible internally / externally.

The principle of the float level indicator is to transmit movement of the float to the pointer over a set of pulleys by means of a float wire/cable. The pointer houses a magnet. A side mounting level switch is attached to the side of the board of the float level indicator. As the pointer moves closer to the magnetic field, the repelling magnet inside the switch housing actuates a set of micro-switches. The magnet latch remains in the new position until the pointer comes back within the repelling magnetic field to actuate the micro-switches.

Type : 2 SPDT, Micro, 10 A @ 250 V AC /

0.2 A @ 250 V DC

On / Off Differential : within 25 mm

Switch enclosure : Die cast Aluminum IP 67 /

Flame proof Group IIC

Cable Entry (Dual) : 3/4 ET / NPT

Fitting Components : AISI 304

Ease of maintenance, major cost reductions

No specific restrictions on the number of switches.

Virtually non contact type of switching.

Dangerous liquids are not drawn into any external chamber.

NO PROCESS CONTACT.

Switching area is isolated from the process liquids.

Set point can be changed at any point of time by simply moving

the level switch to the desired switching level.

Once the board is installed, the switching point required is

directly available on the board. Makes installation fast

No nozzles to blank for maintenance.

No isolation valves to control.

No tank downturn for maintenance of level switch.

Extreme scalability Process temperature / pressure /

chemical compatibility issues with regular switches directly

fitted to the tank are eliminated.






Model Number Coding for Float Level Indicator (optional Level Switch)

Model Decoding example: FLI-F-O-F-4-V-4m

Float Level Indicator, with

- Full Scale Type

- Overhead Design

- Connection Flanged (specify Connection Details & Size)

- SS 304 Float

- Vapour / Liquid Seal Assembly

- 0 - 4 m

Note

All the Float Level Indicators / Float Level Indicator with Level

Switches mentioned in this catalogue are our standard design. If

the standard items do not meet your requirements, we can modify

them to meet your specifications and would appreciate the

opportunity of making suggestions to cover your application, based

on engineering principles. SIGMA reserves the right to modify

specification / design from time to time, which is deemed suitable

for the product without prior intimation.

Design

O - OverheadU - Sump /

UndergroundF -Floating

Roof

Materialof Float

4-SS3046-SS316

4L-SS304L6L-SS316L

P-PPV-PVCT-Teflon

S-SpecifiedMaterial

Range inmeter

SpecifyFloat Level

Indicator

FLI Type

F - Full Scale

H - Half Scale

Connection


S-SocketWeld

B-Butt Weld

SpecialFeature

N-NoneV - Vapour / Liquid

seal AssemblyL - Lining / Coating

on FloatS - Level Switch



- For ordering Level Switch with Float Level Indicator, specify the number of Level Switches required.


Note






Automatic Tank Level Gauge (Float & Tape Type) August Series

Auto Tank Gauge Operation


SIGMAs AUGUST series Automatic Tank Gauges are designed to provide continuous liquid level measurement

for bulk storage applications. The AUGUST is a float actuated instrument that provides continuous and reliable

liquid level measurement, specifically engineered to reduce maintenance and enhance reliability.

In principle, the AUGUST utilizes a large stainless steel float that is attached to a perforated stainless steel tape to detect the liquid level.

The float traces the liquid level rise and fall due to the constant pull-back tension force provided by a power spring. The precisely perforated tape

engages pins on a sprocket drive wheel that in turn drives the measurement counter mechanism. The float is guided between the guide wires

that are kept straight/kink free through the tension devices. Alternatively, still wells that shall guide the float can be used where

there is no provision for guide wires. This simple, rugged design makes the gauge to perform with negligible maintenance throughout its

working life.

TAPE

GAUGE HEAD

STORAGE WHEEL

GAUGE CHECKER

SPROCKET DRIVE

TAPE

TAPE ENTRY, SIDE MOUNTING

TAPE ENTRY, TOP MOUNTING

POWER WHEELTAPE STORAGE

POWER SPRING

TAPE KEEPER

DRAIN(SIDE MOUNTING)

(TOP MOUNTING)DRAIN

0 0 3

COUNTER






Gauge Construction

Specifications

Sigma Advant-edge

Note

All the Automatic Tank Level Gauge mentioned in this catalogue are

our standard design. If the standard items do not meet your




the right to modify specification / design from time to time, which is

deemed suitable for the product without prior intimation.

Gauge Body : Cast Aluminum Epoxy Powder Coated.

Shaft : AISI 304.

Bearing : Brass/Delrin/Glass filled PTFE.

Counter : Thermoplastic Components.

Float : AISI 316/ specified.

Perforated Tape : AISI 316.

Guide wires : Multi Strand AISI 316.

Tensional spring : Plated CS/ SS optional.

Tension Device : CS/GI/ optional materials as required.

Bottom Anchor : CS/ AISI 304 / AISI 316/ optional

materials as required.

Pulley Housing

(90 Elbow) : Cast Aluminium.

Pulley : Al / AISI 316 / specified.

Shaft : AISI 304.

Pulley Bushing : PTFE/Nylon/Delrin.

Range : 0-4M, 0-8M, 0-12M, 0-16M, 0-20M

(For higher range consult factory)

Indication : In millimeters ( 4 digit mechanical counter)

Temperature : 0 C to 160 C

Resolution : 1 mm

Accuracy : 2 mm with 300 mm diameter float for

liquid of specific gravity = 0.8 and above.

Protection : Weatherproof to IP-65 as per IS:2147-1962

Gauge Shaft seals for oil filling:

AUGUST comes with an optional gauge shaft seals that allows

the entire gauge head to remain in light oil, for longevity, smooth

working and corrosion protection of main components in aggressive

environments or where tank vapors can peek inside

the gauge head.

Gauge Check Handle/Striker:

AUGUST comes complete with an easy to grip gauge check

handle. The gauge check handle when turned deflects the tape in the

sheave storage assembly, thus picking up the tape and the float. This

allows the testing of the power spring strength. It also is used for

checking gauge calibration, plumbing of the float alignment, or

freeing stuck-up gauges.

Tape Keeper:

AUGUST comes with a take keeper around the sprocket wheel

that allows tape to be installed simply by inserting the tape

around the tape keeper wheels.

Tape Entry:

AUGUST gauge head is uniquely designed to allow tape entry for

both tank top mounting and tank-side mounting. The orientation

while mounting remains unchanged and so is the viewing direction.

Hoist Mechanism:

AUGUST with an optional hoist mechanism is used to hoist the

float to facilitate easy tank maintenance. It is also used for high

viscosity liquids or the liquids which may solidify at ambient

temperature. With the help of the hoist mechanism, the float is

lowered at the time of measuring the level and is hoisted again.

Gauge Body Protection:

AUGUST comes with epoxy powder coating to reduce the

amount of moisture entering the gauge head through normal

breathing of the aluminum housing. It effectively seals the unit

from water penetration.

Note: AUGUST Gauge head is a purely mechanical device, hence enclosure as per IS:2147 is not applicable for this item.

FLOATING ROOF

PULLEY HOUSING

SUPPORT

GAUGE HEAD

SIDE MOUNTINGFLOATING ROOF(WITH FLOATWELL)

PULLEY HOUSING

SUPPORT

GAUGE HEAD

SIDE MOUNTINGSTILLING WELL

PULLEY HOUSING

SUPPORT

GAUGE HEAD

SIDE MOUNTING

CONE ROOF TANK

PULLEY HOUSING

SUPPORT

TENSION DEVICE

FLOAT

GAUGE HEAD

SIDE MOUNTINGTOP MOUNTING

TENSION DEVICE

FLOAT

GAUGE HEAD0 0 3






Installation Options






Model Number Coding for Automatic Tank Gauge (Float & Tape Type) Level Gauge

TypeS - StandardW - With Hoist MechanismG - Gauge Head oil filledA-2+3

MountingT - Top of TankS - Side of TankF - Floating RoofO - Others specify

Range1- 0 - 4000 mm 4. 0 - 16000 mm2 - 0 - 8000 mm 5. 0 - 20000 mm3 - 0 - 12000 mm A - Specified

Tension DeviceN - None 3 - SS316 with SS Spring1 - CS with CS Spring A - Others specify2 - SS 304 with SS Spring

FloataN - None

b1 - 150 mm for Still Well, AISI 316 b2 - 300 mm AISI 316 b3 - 375 mm AISI 316

b4 - Interface Float AISI 316 A - Others specify

OptionalL - Liquid Seal AssemblyS - Limit SwitchesT - 2 wire Transmitter

Model Decoding example: ATG-S - T - 1 - 1 - 2 - 4 - 1 - L

Automatic Tank Gauge (Float & Tape Type) Level Gauge, with

- Standard design - Tension Device (SS 304 with SS Spring)

- Mounting on Top of Tank - SS 304 Guide Rod

- 0 -4000 mm Range - 375 mm AISI 316 Float

- Process connection 1 BSP (M) CS - Liquid Seal Assembly

a. Guide Wires/Tension devices/Float are NOT required for floating roof tanks. Floats are required if Floating roof with float wel l is

used. In this case, Guide rods may be used based on floating well tank dimensions. Accuracy of floating roof will depend purely

on roof/float well movement. In case of floating roof the tape is attached to the floating roof itself. In floating roof tank installations,

it is recommended that gauges be installed in a float well, rather than attaching the tape directly to the tank roof. The float well should

contain a baffle to prevent the float from escaping, but also allow sufficient product movement to equalize the liquid level. No tape

should be exposed outside of the roof or pipe work. If any section of the tape is currently exposed it should be replaced with a SS

flexible cable,this will reduce measurement error due to wind drift. The connector between the tape and cable should not run over

a conduit elbow (or pulley).

b. Accuracy for the ATLG with : 300 mm diameter float is 2 mm, with 15 mm diameter float is 20 mm

c. Interface float is applicable only for liquids with difference in densities = 0.2 gm/cc.

d. Guide wire/ tension devices, guide rods and bottom anchor are not required when Stilling well for float is provided.

e. In case guide rod option is chosen, no bottom anchor is required.

f. For retrofitting on existing tanks, guide rod assembly (up to 3 M) or weighted bottom anchor (above 3 M) is recommended.

This installation must be done on manhole cover.

g. Gauge Head support brackets, GI Horizontal pipe for pulley , pu lley connections, GI vertical pipe, and 3 Nos tank wall support

with U bolts for pipe work is part of the supply for side moun tingversions. Piping for side mounting can be provided on request.

ATLG(Automatic Tank Gauge)

Process Connection1- BSP(M) CS A - others specify 2 - 1 NPT(M) CS3 - 1 Flanged A 105 ANSI B 16.5

1

Guide RodsN - None4 - SS304 6 - SS316

5 - CS

a,e,f

d






SIDE MOUNTED LEVEL SWITCH (FLOAT LEVEL SWITCH)

Sigma Advant-edge

Specifications


IBR ApprovedSide Mounted Level Switch

Availabl

e

SIGMA's Float Level Switch are compact solutions to monitor low, intermediate and high level in tanks. This rugged, quick

mounting & maintenance free design is an instant choice for tanks with high insertion depths or inaccessible top and bottom.

A small pivoted float forms the only sensing probe that projects within the tank. Typical applications of these sensitive and

accurate devices include strong tanks, high-pressure boilers, sterilizers and process tanks.

Glandless design eliminates leakage from vessel into

switch housing even in high pressure & temperature conditions.

Float arm operates on a flat face with no cavities to clog (this

eliminates float arm malfunction due to unwanted accumulations)

Light in weight and easy to install

Wide differential versions

Choice of mounting and material mix

Special design for high temperature / pressure applications.

Can be used with External Cages

Extension rods to accommodate nozzle lengths or for increasing

switching differential.

Type : Magnetic Internal Float operated.

Float, Stem & Wetted : SS 304 / SS 316 / PVC / PP /parts Material Ebonite / specified.

Switch Housing & Material : Weather proof / Explosion proof IIC in Cast Aluminum / Custom

housing for corrosive atmosphere.

Type of Contact : Micro, 2 SPDT.

Rating : 10 A @ 250 V AC ,

0.2 A @ 250 V DC / specified. .

Switch Differential : 12 3 mm.

Conduit : 3/4 BS, / 3/4 NPT / specified.

2 0Pressure / Temperature : 15 - 40 kg/cm / 200 C / specified.

Specific Gravity : 0.7 and above / specified.

Process Connection, Type : 1 1/2 and above, Screwed or Flanged / specified. Miniature

25 NB special design available.

Float Size : 47 or 60 mm / specified.

Note: For Safety measures, we recommend the fuses in

series & also contactor / relays for start and stop function

of motors.






Model Number Coding for Side Mounted Level Switch

Rating

150 #300 #Other

Specify

OperatingPressure

1- Nominal Pressure

2- Upto215 Kg/cm

3- Upto240 Kg/cm

4- HighPressure

Materialof Flanges

2-IS 20624-SS3045-A105


P-PPV-PVC

S-SpecifiedMaterial

Connection


S-SocketWeld

B-Butt Weld

Size

25 NB40 NB50 NB80 NB

100 NB

OtherSpecify

S - 120 OD x 92 mm PCD

Materialof Float

4-SS3046-SS316

4L-SS304L6L-SS316L

P-PPV-PVC

S-SpecifiedMaterial

EnclosureClass

W-Weather Proof

F-FlameProof

Side Mounted

Level Switch

SMLS OptionalFeatures

N-None

P - Plug & Socket

F-Cooling Fins

C - With Chamber

Model Decoding example: SMLS- F - 40 - 150 # - 4 - 2 - 4 - W - P

Side Mounted Level Switch, with

- Flanged Connection - SS 304 Float

- 40 NB Size - Weather Proof Enclosure

- 150 # Rating - Plug & Socket (specify no.of pins)

- SS 304 Flange - 2 SPDT Switch is supplied as Standard2- Operating Pressure up to 15 kg/cm





- The product conforms to 97/23/EC: Pressure Equipment Directive, Article 3.3 Sound Engineering Practice and 2006/95/EC:

Low Voltage Directive (LVD)

Note

Note

All the Side Mounted Level Switches mentioned in this catalogue

are our standard design. If the standard items do not meet your











EXTERNAL CAGE LEVEL CONTROLLER

Sigma Advant-edge

Specifications


IBR ApprovedExternal Cage Level Switch

Availabl

e

SIGMA's External cage liquid level switches are very widely used for the petroleum and power industries. Anti vibration

design ensures positive switch activation. Being highly versatile, cage mounted type extends to a wide range of other

possible applications.

Rugged in construction and easy to install

Facilitates maintenance, inspection & cleaning

High temperature and pressure versions

Special coating and special designs for corrosive applications.

Center - center Distance (cc) : 150 mm - 1500 mm

Orientation Type : Vertical

Level Control : Single Level (One float) / Single Float with two or three

level, set point between two

levels 40 mm min / Two Levels

Dual Float.

Float & Size : Spherical / Cylindrical,

Application based/specified.

Float Material : SS 316 / PP / PVC

Chamber : CS/ AISI 304 / 316 / specified.

Switch Housing : Weather proof IP 67 / Explosion proof IIA IIB, IIC

Switch : Micro, sealed assembly available.

Current Rating : 10 / 15 A / 250 V A.C Max / specified.

Conduit Connection : or 3/4 NPT, 3/4 to 1 ET.

Differential : Fixed 12 3 mm / Adjustable differential / set point.

Process Connection : Flanged / Threaded / Socket Weld

Process Orientation : Side-Side or Side and bottom, Side-Side connection

Pressure : 15 - 50 bar / specified.

In Sealed chamber Level Switch, the Float Chamber is completely

sealed with float inside the chamber. By virtue of sealed cable entry,

the switch can be used for refrigerants, with low specific gravity.

Special designs for 98% H SO applicable is also available.2 4

Sealed Chamber Level Switch

Additional Features (optional): 0 0For high temperature between 250 C - 550 C SS Cooling Fins

are provided to reduce the temperature of the housing. Special construction of the chamber & flange ratings are designed for high-pressure applications. Vertical float type can be substituted with displacer in place of float for increasing pressure / temperature capacity. For low specific gravity liquids ranging from 0.5 to 0.8 additional fixture is provided for efficient operation of the switch.






Model Number Coding for External Cage Level Controller

Orientation

S-Side-Side

B-Bottom-Side

Connection


S-SocketWeld

B-Butt Weld

No.of Float

1-One2-Two

OperatingPressure

1-Upto215 kg/cm

2- Upto225 Kg/Cm

S - Specify

2- Upto250 Kg/Cm

Materialof Cage

4-SS3045-A106 Gr.B


P-PPV-PVCOther

Specify

EnclosureClass

W-Weather Proof

F-FlameProof

ECLS

External Cage Level

Switch

Switch Rating

OptionalFeatures

N-None

S-Adjustable Set Point

L- Lining/Coating

C-Cooling Fins

H - Heating Jacket

P - Plug &Socket

C/C in mm

for example 150 mm

SIGMA reserves the right to modify

specification / design from time to

time, which is deemed suitable for

the product without prior intimation.

NoteModel Decoding example: ECLS - S - F - 1 - 4 - 1 - W - M - C-150 mm

External Cage Level Switch, with

- Side-Side orientation - Weather Proof Enclosure

- Flanged Connection (specify size & rating) - Switch rating 15 A, 250 V AC, 0.25 A, 250 V D.C2- Operating Pressure up to 15 kg/cm - Cooling Fins

- SS 304 Cage- - 150 mm c/c

- with one float




- 2 SPDT Switch with 10A @ 250V AC, 0.2 A @ 250V DC is supplied as standard.0 2. - PP (50 C) / PVC / Teflon max pressure rating is 8 Kg/cm - PP/PVC/Teflon switches are available with single float option only.

- The product conforms to 97/23/EC: Pressure Equipment Directive, Article 3.3 & 2006/95/EC:Low Voltage Directive (LVD)


Note

C/C

FlangedSide Side

C/C

With CoolingFins

Threaded / SocketSide Side

C/C

SealedSide - Side

C/C

C-5/10 A250 V A.C,

0.2 A, 250 V D.C

M - 15 A250 V A.C,

0.25 A, 250 V D.C

H - Sealed Switch, 5 A250 V A.C,

0.2 A , 250 V D.C






TOP MOUNTED LEVEL SWITCH

Sigma Advant-edge Specifications


IBR ApprovedTop Mounted Level Switch

Availabl

e

Severity, adversity... whatever the conditions of environment, SIGMA liquid level controllers keep operating. Rugged design

of our units offer an electrical compartment completely isolated from the product level to be monitored. This makes it to

withstand the extremely severe conditions to be met with in a wide range of a wide range of Chemical, Petrochemical, Power

and other Process industries. A wide range of SIGMA level controllers in an application bound material mix provide choice for

one, two, three or four level monitoring by trigger related systems through contactors or relay. The level sensor termed as

displacer is designed to suit high temperature and pressures. With wide differential models, the use extends to open tanks,

slurry and treatment plants, neutralization pits etc.

Easy installation, no manholes required.

Field level settings.

Adjustable differential versions.

Can be used with external chambers.

Level of operation up to 20 m.

No rods to bend, only multi-stranded cables (ss wire) used

Glandless rugged design to suit a wide spectrum of

pressure and temperature.

Suitable for foaming, surging and highly viscous liquid.

Type : Top Mounted Displacer Type.

Connection Size & Type : 2" and above as per ANSI, DIN or

BS standard or Screwed NPT.

2 Pressure : up to 50 kg/cm / specified.0Temperature : 150 C / For higher temperature

consult Sigma.

Flange Material : CS / SS 304 / SS 316 / PP / PVC / Teflon / HDPE / specified.

Spring : SS 316 / specified.

Spring Housing / Holder: SS 304 / SS316 / PP / PVC etc.

Wire Material : Multi stranded SS 316 / Nylon / C.S / PP / specified.

Displacer Material : Porcelain, SS 304 or SS 316 , C.S,

Rubber, Teflon Lined, PP / PVC /

Teflon / specified.

Switch Housing : Die Cast Aluminum, Weather proof or Explosion proof IIA , IIB or IIC.

Contacts (Micro Switch) : 10 A / 15 A @ 250 V AC / specified. 2 SPDT is a standard.

Specific Gravity : 0.7 - 1.2, for others consult Sigma.

Level of Operation : up to 20 meter

Differential : Approx. 50 mm / specified.

X

X

StyleB

X

CStyle

X

AStyle






Model Coding example: TMLS - B - 1 - S - F - 4 - 80 NB - 300# - 6 - C - W - P

Top Mounted Level Switch, with

- Two Level - 300# Rating2- Operating Pressure up to 15 kg/cm - SS 316 Displacer

- Still Well Displacer Guide - Switch rating 5/10 A, 250 V AC, 0.25 A, 250 V D.C

- Flanged connection - Weather proof enclosure

- SS 304 Flange - Plug & Socket

- Flange Size 80 NB - Standard: 2 SPDT Switch is provided

Model Number Coding for External Cage Level Controller

TypeA - Single Level AB - Three LevelB - Two Level BB - Four LevelC- Single Level with wide differentialD- Two Level with wide differential

Displacer GuideW - No Still WellS - Still Well C - Cage

Type of ConnectionF - Flanged S - Screwed

Material of Flange2 - IS 2062 6L - SS 316L4 - SS 304 P -PP5 - A 105 V - PVC6 - SS 316 T - Teflon4L - SS 304L S - Specified

Size50 NB 80 NB100 NB Others Specify

Operating pressure21 - up to 20 kg/cm22 - up to 50 kg/cm

S - Specified

TMLS

Rating #150 / 300 / Others Specify

Displacer Material 5 - CS P - PP 6L - SS 316L4 - SS 304 V - PVC T - TeflonC - Porcelain 6 - SS 3164L - SS 304L S - Specified

Enclosure ClassW - Weather ProofF - Flame Proof

Optional N - None P - Plug & SocketC - Cooling Fins S - Specified

Switch RatingC - 5 / 10 A 250 V ~, 0.2 A 250 V -M - 15 A, 250 V ~, 0.25 A, 250 V -H - Sealed Switch 5 A, 250 V ~ / S - Specified

X

X

StyleD

X

X

X

StyleAB

X

X

X

X

StyleBB


- In case of choosing multiple specification under a specific category, mention the 2nd / 3rd code

with a bracket, after the 1st code.

- For ordering IBR approved product, mention "IBR" immediately after the Product code.2 0 - PP/PVC/Teflon max pressure rating is 10Kg/cm - PP max temperature rating is 50 C

- The product conforms to 2006/95/EC: Low Voltage Directive (LVD) per Harmonized standard

EN 61010-1/1993 & Amendment No.1


- SIGMA reserves the right to modify specification / design from time to time, which is deemed

suitable for the product without prior intimation.

Note






LEVEL SWITCH (REED TYPE)

Sigma Advant-edge Specifications


IBR ApprovedLevel Switch (REED Type)

Availabl

e

OIL LEVEL SWITCHWITH CHAMBER

SIGMA Float operated Reed Level Switch are ideally designed for liquid level indication in tanks. The design is simple and

compact. Typical applications are water, diesel, chemical storage and hydraulic tanks. The level switch consists of a sealed

tube inside which hermetically sealed Reed Switches are placed at points where switching operations are required. The

magnetic float raises / falls with the liquid level and operates / re-operates the Reed Switch (make or break on rise / fall of

liquid level specified). The REED Type Level Switch is available in Top Mounted and Side Mounted Version.

Cost effective level detection

Terminal enclosure - weather proof

Collars prevent false switch re-operation due to over travel of float

SPST or SPDT REED Switches

Immune to electrical disturbance

Unaffected by liquid characteristics

Flanged / Screwed vessel connection.

Choice of material mix.

Multiple Level (Single / Double / Triple...)

Plug & Socket type of cable connection where desired

Float / Stem : SS 304 / SS 316, PP, PVC / specified material

Terminal Enclosure : Weather Proof / Flame Proof

Terminal Enclosure Material : Cast Aluminum / Plastic

Contact : Hermetically sealed REED, SPST or SPDT

Contact Rating : 20 VA / 60 VA / specified.

Contact Voltage Max : 250 V AC or 120 V DC

2 2Maximum Pressure : 5 kg/cm for PP / PVC, 15 kg/cm for SS, consult Sigma for

higher pressure.

0 0Maximum Temperature : PP / PVC: 55 C , SS: 100 C

Float Size : Application based

Note: For safety measure / contact protection, we recommend use of fuses in series and Relays / Contactors for start / stop function of

motors / buzzer / any drive function






Model Number Coding for Top Mounted Level Switch (REED Type)

OptionalFeatures

N-None

P - Plug &Socket

T - TopMounted

LevelSwitch (REED Type)

LSR OperatingPressure

1-Up to23 kg/cm

2 - up to210 kg/cm

4- Custom

3 - up to 215 kg/cm

Switch

S-SPDTD-SPDT

Materialof Flange

4 - SS3045 - A 1056 - SS3164L-SS304L6L-SS316L

P-PPV-PVCT-TeflonOthersSpecify

2 - IS 2062

OthersSpecify

FloatMaterial

4 - SS3046 - SS3164L-SS304L6L-SS316L

P-PPV-PVCT-TeflonN-Nylon

EnclosureClass

W-Weather Proof

F-FlameProof

Type

A- Single Level

B - TwoLevelAB -

Three LevelBB -

Four Level

Type of Connection

S - ScrewedF - Flanged

S - SideMounted

LevelSwitch (REED Type)

C- with Chamber

Note

All the Level Switch (REED Type) mentioned in this

catalogue are our standard design. If the standard items

do not meet your requirements, we can modify them to

meet your specifications and would appreciate the

opportunity of making suggestions to cover your

application, based on engineering principles. SIGMA

reserves the right to modify specification / design from

time to time, which is deemed suitable for the product

without prior intimation.

Only Single Level is available in Side Mounted Level Switch (REED Type)

Model Decoding example: LSRT - B - 1 - F - 2 - 4 - W- S - N

Top Mounted Level Switch Reed Type, with

- Two Level2- Operating Pressure up to 3 kg/cm

- Flange connection

- IS 2062 Flange

- SS 304 Float

- Weather Proof enclosure

- 1 SPDT Switch

- No Special feature

Note




- The product conforms to 2006/95/EC: Low Voltage Directive (LVD) per Harmonized standard EN 61010-1/1993 & Amendment No.1

- Side mounted option is available in Single Float Type.

- In case of doubt, contact SIGMA for assistance in arriving at the model code / or specification.






CONDUCTIVITY LEVEL SWITCH

Specifications

Sigma Advant-edge


SIGMA's Conductivity Level Switches are simple, low cost and reliable instruments, for detection of conductive liquids. The

Level Switch is available in single / multipoint level detection. A low alternating voltage is impressed between the active

electrode(s) and the vessel wall / reference electrode. When the liquid comes in contact with the tip of the active electrode(s),

an electrical path to ground is completed, closing the loop, resulting in flow of current. The current is transmitted to the control

unit directly (in case of multiwire / integral design) or through a pre amplifier housed inside the probe head (in case of two wire

design). The amplifier inside the control unit processes the signal and amplifies it to drive LED/ relay circuits.

Enclosure : Cast Aluminum, Weather proof IP 66 &

Explosion Proof IIA IIB

Electrode Type : Solid up to 4 m, suspended upto 10 m

Electrode MOC : SS 304 / SS 316 / Haste alloy /

Titanium Tips / specified.

Electrode insulation 0 0/ Temperature : PVC (70 C), PTFE (200 C)

Reference (R)

/ Control Electrode (C) : 1 / 4 (or custom)

Minimum Conductivity : 25 s

Power Supply : 230 V AC / 110 V DC +/- 10 % , 50 HZ / 24 V DC

Output relay contact

rating : 5 A at 230 V AC

Process Connection : CS / SS 304 / SS 316, 1 & above Flanged / Screwed to ANSI / specified.

Cable entry : NPT (F) or 3/4 ET / specified.

Mounting : Vertical / Horizontal 2Pressure : 20 kg/cm

Service : Water, Acids, Alkali

Note : 1 is Flange is for up to 2 levels only.

No Moving parts

Power Supply Indication

LED Indication / Relay Output for 4 different preset levels

Selectable high / low level alarm

Special probe design to tackle acids.

Latching type relay design for direct auto pump operation

Auto sensitivity to liquid conductivities > 25 s

Option of stand alone system

Note

All the Conductivity Level Switches mentioned in this catalogue are






deemed suitable for the product without prior intimation from time

to time.

Electrode Size

Specify length of

Reference& control

electrode(s)

Cable Entry

1- 1/2 NPT(F)

3 - 3/4 ETS - Others

specify

Process Connection

F - Flanged

S - Screwed

Control Electrode

C1 - FirstC2 - Two

C3 - ThreeC4 - FourS - Others

Specify

ElectrodeInsulation

P - PVCF - PTFE

S - OthersSpecify

Electrode Material

4-SS304

H-Haste Alloy

6-SS316

T- Titanium

Electrode

S - SolidH -

Suspended

Mounting

V - VerticalH - Horizontal

Conductivity Level

Switch

CLS

Model Number Coding for Conductivity Level Switch

While ordering, specify Process Connection Material, size (Flange or Thread) and Flange rating






Model Decoding example: CLS - V - S - 4 - P - C2 - F - 1- R-1000 - C1-500- C2 - 350

Conductivity Level Switch, with

- Vertical Mounting option - Cable Entry NPT (F)

- Solid Electrode - Reference electrode length - 1000 mm

- SS304 Electrode - 1st Control electrode length - 500 mm

- Electrode Insulation: PVC - 2nd Control electrode length: 350 mm

- Two Control Electrodes

- Process Connection, Flanged




Note

S - Specified






PNEUMATIC LEVEL SWITCHES

Note

All the Pneumatic Level Switches mentioned in this catalogue are








IBR ApprovedPneumatic Level Switch

Availabl

e

Specifications

- Scrubbers and Separators - Bulk Liquid Storage

- H S & CO Service - Radiator Level2 2

- Process Vessels - Oil Sumps

- Water / Fuel Tanks - Day Tanks

Application Areas of Pneumatic Level Switches

Side Mounted : (with / without cage) Top Mounted : Float/ Displacer (with/without cage)

SIGMA's Pneumatic Level Switches are used in application where electrical switching is not recommended or electricity is

not available. The working principle is the same, except that the magnet indirectly actuates a 3/2 valve for changeover. This 2system requires minimum 2 kg/cm clean filtered air, preferably through an AFR. In Order to protect the switch assembly

from contaminants, filtered and dried gas/air supply is recommended

Operating Pressure : 2 - 8 Bar

Permissible Fluids : Air/Inert Gas

Fluid temperature : -10 to +50 Deg C

Connection size : 1/8 NPT / NPT

Switch Differential : Within 20 mm (float type)

Process Pressure : Up to 20 Bar / specified

Process Temperature : -10 to 75 Deg C / specified.For Higher Process pressure / temperature consult Sigma.

Consult Sigma for ordering code

Buoyancy force of process liquid on a float causes the float to move

with the liquid's surface. Float movement pivots a magnet into the

field of a like-charged switch magnet. As the magnets repel each

other, the switch magnet moves, actuating the switch.

Free swinging float arm

- No cavities to clog (eliminates Float Stick)

Magnetically activated

- No seals to maintain / No leaks / No fugitive emissions.

Operation is based upon simple buoyancy, whereby a float or a

spring loaded weighted displacer rises following the liquid level. A

magnetic sleeve, connected to the float / displacer, moves up and

operates within a non-magnetic enclosure tube. The magnetic sleeve

attracts a pivoted magnet, actuating a switch mechanism located

out-side the enclosure tube to give NO or NC changeover. A fall of

liquid level will de-actuate the switch mechanism






MAGNETIC FLOAT OPERATED LEVEL TRANSMITTER

NOTE: SIGMA reserves the right to modify specification / design from time to time, which is deemed suitable for the product without prior intimation.


Specifications

Operating principle

Sigma Advant-edge

Continuous 'Float Type' Analog Sensor, in materials, resistive

to most liquids

Pre calibrated at factory-No Field Calibration required

4-20 mA, 2 wire processed output signal

High Resolution & Repeatability

Liquid level or liquid / liquid interface detection

Length up to 3.5 m, RS-232, RS-485 compatible

Model No.Coding - Magnetic Float Operated Level Transmitter

Range(mm)

Specify in meter

SigmaMagnetic

Float Operated

Level Transmitter

SIML-TXWettedParts

4-SS3046-SS316

P-PPS-other specify

Process Connection

F - Flanged

S - Screwed

While ordering, specify:1. Process Connection Material & size (Flange or Thread) and Flange rating.2. Conduit Connection

SIGMA's Magnetic Float Operated Level Transmitter is a simple and reliable technique for continuous level

indication and control of any liquid, chemically compatible with the (sensor) material, unaffected by electrical

conductivity, temperature, pressure or viscosity. The float is designed for variety of liquids.

Span (L) : up to 3 m / specified.

Resolution : 10 mm

Mounting : Top

Enslosure : Cast Aluminum Weather proof to IP 67 or Explosion proof IIA & IIB.

Conduit Connection : Brass, 3/4" ET or 1/2" NPT

Wetted Parts : SS304, SS316, PP / specified.

Float(Material & Size) : Suitable for process parameter.

Process Connection : 2" and above Flanged or threaded to ANSI / BS / DIN std.

Output : DC 4-20 mA (isolated) or 1 to 5 VDC (optional).

Wiring System : 2 Wire0Temperature :100 C / Specified

2Test Pressure :10 kg/cm / Specified.

Optional :Process Indicator with alarm. Application : Storage Tanks (Fuel, Oil, Chemical, Water),

Pressurized Vessels, Waste Water Treatment Plant.

The Transmitter consists of a float & guide stem assembly in non-

magnetic material to achieve undisturbed flux. A chain of closely

spaced glass encapsulated reed switches & resistors are placed

inside the guide tube. During rise and fall of liquid level, the magnetic

float moves & actuates a reed switch in the chain. The sensed voltage

is fed to the transmitter located in the enclosure for conversion to a

signal of 4-20 mA.






SIGHT FLOW INDICATOR (FLOW GLASS)

Sigma Advant-edge

Specifications


IBR ApprovedSight Flow Indicator

Availabl

e

SIGMA's Sight Flow Indicator (Flow Glass) are designed to facilitate instant visual indication of liquids flowing through pipes

even from a distance. Visual inspection and proper control of vital areas are important in processes for proper operation of

well-designed plants. These are available in various types such as Flapper, Drip Lip, Full View, Elbow etc. with Double or

Single windows in Flanged or Screwed and other end connection. For ease of installation, Flanged Type for sizes 3" and

above are preferred.

Simple and rugged in construction

Easy Installation

Customized Material mix

Process connection extend to a wide range of sizes

Variety of models to choose from

Clear Visual indication even from a distance

Special coatings for specific application

Line size : up to 16" / specified.

Body Material : Carbon Steel / SS 304 / SS 316 / SS 316L,

Bronze / Cast Iron (Grade 20 or WCB), PVC /

PP / Teflon or specified material / lining /

specified.

Cover Plate : Cast Iron, Steel and other materials.

Flapper / Rotor : SS / Teflon / PVC / PP / Nylon / specified.

Gasket : Neoprene, Klingerite, Compressed Asbestos, Viton ,Rubber, Teflon, Non Asbestos,

Spiral Wound, Grafoil etc.

Glass : Toughened Soda Lime Glass (Temperature 0 upto 150 C) Oil tempered or toughened

0 borosilicate (Temperature up to 300 C)

Connection : Flanged type - ANSI, BS, DIN JIS Standard or Screwed Type - NPT, BSP, BSPT, API or

METRIC thread.

Optional : High temperature jacketed types, Frost shield, Illuminator etc.,

Also available Full View Lantern Type .

Tank Level & Flow Instrumentat

Documents

SIGMA Complete Catalogue [2010]