LSU 100, Ultrasonic level transmitter · The LSU 100 ultrasonic level transmitter ... Ui=30V, Ii=120mA, P=0.82W, Li=27μH, Ci=5nF Materials of construction: • PVC moulded body and

LSU 100, Ultrasonic level transmitter

Installation andmaintenance manual

Table of Contents

Introduction............................................................................................................................................ 2General................................................................................................................................................. 2

Safety Instructions.................................................................................................................................. 3General................................................................................................................................................. 3Technical Data..................................................................................................................................... 3Special conditions for safe use.......................................................................................................... 3

Product description............................................................................................................................... 4The LSU 100 ultrasonic level transmitter.......................................................................................... 4Ex Safety Data...................................................................................................................................... 4Pressure Equipment Directive........................................................................................................... 5Specifications....................................................................................................................................... 5

Installation............................................................................................................................................... 6General................................................................................................................................................. 6Location of the LSU 100 transmitter..................................................................................................6General considerations.......................................................................................................................6Liquid surface conditions................................................................................................................... 7In-tank / well effects.............................................................................................................................7Open Channel Flow installations.......................................................................................................7Mounting the transmitter above the liquid surface.........................................................................9Wiring................................................................................................................................................. 10Additional components in the two wire loop:...............................................................................10

Commissioning/Programming...........................................................................................................12Commissioning/Programming........................................................................................................12

Maintenance......................................................................................................................................... 13Maintenance...................................................................................................................................... 13

Appendix 1........................................................................................................................................... 14Safety Instructions specific to hazardous area installations......................................................... 14

Appendix 2........................................................................................................................................... 16FM Control Drawing......................................................................................................................... 16

Table of Contents

LSU 100, Ultrasonic level transmitter Installation and maintenance manual 1

IntroductionGeneral

The Flygt LSU 100 ultrasonic level transmitter is designed to be mounted above a liquidand will measure the distance to the liquid surface.

When programmed with details of the vessel, sump or open channel, the LSU 100 willcompute level, contents or flow and give a 4-20mA signal proportional to the chosenvariable.

LSU 100 is a two wire 24V powered transmitter and may be connected to any suitable dcpower source using the factory fitted cable. The Flygt APP and FGC ranges of control unitsare designed to be used with the LSU 100 transmitter in this way.

The LSU 100 transmitter may be mounted in a hazardous area provided that it is suppliedfrom a protected power supply.

For EX applications, it is the responsibility of the user to ensure suitable Intrinsically SafeBarriers are installed, see Safety Instructions specific to hazardous area installations (page14).

In this manual the following terms are used which refer to trademarks from othermanufactures:

• HART: is the protocol adopted for the LSU 100 SMART Communications.• HART is a registred trademark of the HART Communication Foundation and is a

mnemonic for Highway Addressable Remote Transducer.

Introduction

2 LSU 100, Ultrasonic level transmitter Installation and maintenance manual

Safety InstructionsGeneral

Model number covered: LSU 100.

The following instructions apply to equipment covered by Ex certificate numbersBAS01ATEX1061X and CSA 1352094 respectively:

• Installation must be carried out by suitably trained personnel in accordance with the applicablecode of practice.

• If the equipment is likely to come into contact with aggressive substances, it is theresponsibility of the user to take suitable precautions that prevent it from being adverselyaffected, thus ensuring that the type of protection is not compromised.Aggressive Substances – e.g. acidic liquids or gases that may attack metals or solvents that mayaffect polymeric materials.Suitable Precautions – e. g. regular checks as part of routine inspections or establishing fromthe material’s data sheet that it is resistant to specific chemicals.

• The equipment must only be cleaned with a damp cloth.• The equipment is not intended to be repaired by user and is to be replaced by an equivalent

certified unit. Repairs should only be carried out by the manufacturer or approved repairer.

Technical DataCoding (ATEX): II (1) G

Coding (CSA): II C

Coding (FM): II C

(CEN ELEC) EEx ia IIC T4 - 40°C < Ta < 60°C

EEx ia IIC T6 - 40° < Ta < 55°C

Safety Parameters: Ui=30V, Ii=120mA, P=0.82W, Li=27μH, Ci=5nF

Materials of construction:• PVC moulded body and front face.• PVC sheathed 2 core shielded cable (UL).• Glass filled nylon lock nut.• 316SS hanging bracket.• Epoxy adhesive sealant.

Special conditions for safe use• Do not mount the LSU 100 on a structure that is subject to vibration, or in a position where

damage may be caused by impact or thermal stress.• The equipment is not intended to be used in areas exposed to dust.• The equipment must not be installed directly in any process where the enclosure might be

charged by rapid flow of non-conductive material.

Made for Xylem by Mobrey Limited, UK

Safety Instructions


Product descriptionThe LSU 100 ultrasonic level transmitter

The transmitter is a factory sealed unit with an operating range of 10 – 0 m and 5 – 0respectively. When powered up, the transmitter will give a 4 – 20 mA signal on the two wirepower cable over the factory default range: 4 mA at 0 m; 20 mA at 10 and 5 m respectively.The range may be adjusted using a HART programmer.

See Commissioning/Programming (page 12).

Ø62

228

60

1

2

1. 1 HOLE Ø132. 1" NPT THREAD

A Stainless Steel mounting bracket and 1" NPT Nylon locknut are supplied with thetransmitter to facilitate mounting.

Ex Safety DataType number: LSU 100

Certificate numbers: Sira 09ATEX2081X

09CSA2152611

FM 3036099

ATEX Coding: II 1 G (EU Directive 94/9/EC)

Cenelec Coding Ex ia IIC Ga T4 (-40°C≤Ta≤60°C)

Ex ia IIC Ga T6 (-40°C≤Ta≤55°C)

CSA coding Ex ia IIC T4 (-40°C≤Ta≤60°C)

Ex ia IIC T6 (-40°C≤Ta≤55°C)

FM coding IS/I/1/ABCD T6 (Ta=55°C)

Product description


IS/I/1/ABCD T4 (Ta=60°C)

IS/I/0/AEx ia IIC T6 (Ta=55°C)

IS/I/0/AEx ia IIC T4 (Ta=60°C)

Safety parameters Ui 30V

Ii 120 mA

Pi 0.82 W

Li 27 μH

Ci 5nF

LSU 100 may be mounted in a hazardous area provided it is supplied through or from asuitably protected power supply and safety barrier (part no. 843055).

Refer to the safety parameters given in Safety Instructions specific to hazardous areainstallations (page 14).

Pressure Equipment DirectiveThe LSU 100 transmitter does not enclose a pressurised volume and therefore is acomponent and outside the scope of the Pressure Equipment Directive (97/23/EC).

SpecificationsMaterials of construction:

Body Material PVC (stabilized)

Cable sealant Epoxy adhesive

Locknut Nylon

Bracket Stainless Steel

Cable PVC sheathed two core shielded cable

Electrical:

Supply voltage Transmitter in safe area: 12-40 V dc

Transmitter in Hazardous area: 12-30 V dc

Output 4-20 mA

Communications HART Digital communications (rev. 5)

Earthing None required

Cable size Overall diameter 4.5 mm, two cores each 0.22 mm2

Cable length 20m

Cable resistance 0,1 Ohm per metre length

Operating:

Ranges 5 – 0 m part No. 83 65 02

10 – 0 m part No. 83 65 03

Temperature Ambient - 40°C to +60°C

Wetside - 40°C to +60°C

Pressure 0 bar to 3.0 bar

Product description


InstallationGeneral

LSU 100 may be mounted in a hazardous area provided it is supplied through or from asuitably protected power supply and safety barrier (part no. 843055).

Refer to the safety parameters given in Safety Instructions specific to hazardous areainstallations (page 14).

Location of the LSU 100 transmitterCorrect location of the transmitter is essential for the reliable operation of any ultrasoniclevel measurement system.

The LSU 100 transmitter must be installed in a location where it is protected fromultraviolet radiation, e.g. direct sunlight, in order to prevent long-term degradation of theplastic used in its construction.

Whilst the transmitter may be site tuned to deal with most application conditions, it isstrongly recommended that the following guidelines should be adopted whereverrelevant.

General considerations• The LSU 100 transmitter complies with the European Directive for Electro Magnetic

Compatibility (EMC) (2004/108/EC) Class B.

It is not advisable to mount the transmitter in close proximity to a source of electricalnoise such as a variable frequency drive (VFD) or other high powered electrical device.

• The transmitter should be mounted as near vertical as possible to ensure a good echofrom the liquid surface and maximum echo size received.

The beam angle (to the half power point) of the transmitter is 12 degrees inclusive.

Obstructions in the tank or well will generate echoes which can be confused with thereal liquid surface echo. Obstructions within the beam angle generate strong "false-echoes"; wherever possible, the transmitter should be positioned such that falseechoes are avoided.

To avoid detecting unwanted objects in the tank or well, there will be no false echogenerated provided the wall is smooth and free of protrusions. However, there will stillbe a reduction in the echo size. To avoid large echo size loss, it is recommended thatthe transmitter never be mounted closer than 0.3 m to the wall.

• If the transmitter is mounted in an enclosed tank, avoid mounting the transmitter in thecentre of the tank roof as this could act as a parabolic reflector and create unwantedechoes.

• If the transmitter is mounted in a stand-off or nozzle, it is always preferable that thetransmitter face be at least 5 mm proud of the stand-off such that protrudes beyondthe stand-off and into the tank.

• Remember that the minimum operating range of the transmitter is 300 mm. Thetransmitter will not detect any liquid surface closer than 300 mm to the transmitterface.

Installation


Liquid surface conditions• Foaming liquids can reduce the size of the returned echo as foam is a poor ultrasonic

reflector. It is always preferable to mount an ultrasonic transmitter over an area of clearliquid, such as near the inlet to a tank or well. In extreme conditions, or where this isnot possible, the transmitter may be mounted in a vented tube provided that theinside of the stilling tube is at least 100 mm and is smooth and free from joints orprotrusions. It is also preferable that the bottom of the stilling tube does not becomeuncovered, thus preventing the ingress of foams.

• Beware of mounting the transmitter directly over any inlet stream.• Liquid surface turbulence is not normally a problem unless it is excessive. In most

cases, the effects or turbulence are minor, with excessive turbulence being catered forby fine tuning the transmitter on site if necessary.

In-tank / well effects• Stirrers or agitators can cause a vortex. Always try to mount the transmitter off-centre of

any vortex to maximize the return echo.

As stirrer blades become uncovered they will create echoes as they pass through theultrasonic beam. The transmitter can be tuned to ignore there false echoes on site.

• In non-linear tanks with rounded or conical bottoms, always mount the transmitter off-centre. In some cases, it may be desirable to install a perforated reflector plate on thetank bottom directly under the transmitter centre line to ensure a satisfactory returnecho.

• Avoid mounting the transmitter directly above any pumps in the well as the transmitterwill detect the pump casing as the liquid falls away. If this is not possible, fine tuning onsite may be required to ignore echoes from the pump casings.

• If the well is subject to flooding, it is advisable to fit the transmitter with a submersionshield. Whilst the transmitter will of course stop working whilst covered with liquid, thetransmit face will be protected from contamination by an air lock inside the shield.

Open Channel Flow installationsThere are normally two distinct parts to an open channel flow measurement system; theprimary element (flow structure) and the secondary element (Head measurementinstrumentation).

For accurate open channel flow measurement, both parts of the system must be installedaccurately.

This manual explains some key aspects of the installation of the secondary element, in thiscase the ultrasonic transducer.

Installation


For full details of the installation of a primary element such as a flume or weir, referenceshould be made to the relevant British (BS3680) or International standard.

• Positioning of the transmitter is critical and should be the correct distance upstreamfrom the flow structure as stated in BS3680 (British standard= e. g. a distance of 4 to 5times hmax for a thin plate weir or 3 to 4 times hmax for a flume.

For optimum accuracy, the front face of the sensor should be positioned at a heightthat is at least equal to the maximum flow depth plus the blanking distance of thetransducer. A distance of 350 mm is recommended.

It is important to note that the bottom reference of the transmitter should be related tothe centre of the invert of the primary device, NOT the distance to the channel bottomdirectly below the transmitter.

1

2

3

41. Channel invert2. Flow

Installation


3. Transmitter bottom4. Primary element (e g. flume, weir) invert

In addition to the above, when setting the bottom reference on a 'V' notch weir it isimportant that the true invert of weir is taken and not the meniscus liquid level, whichmay be 2 to 3 mm above the true invert.

2

3

1

1. Transmitter bottom reference2. True invert3. Meniscus

• The liquid surface at the point of measurement must have a stable, smooth surface anduniform approach velocity. It must not be affected by baffles, foam, hydraulic jumps orany other object likely to cause flow disruption.

• The primary element should be free from any situation where it is likely to 'drown'(refer to relevant standard for further information).

• The LSU 100 transmitter has integral temperature compensation and must beprotected at all times from direct sunlight and any radiated heat.For maximum accuracy and stability of level measurement reading the transmittershould always be shrouded to prevent the incidence of direct sunlight.If the flow structure permits, mount the transmitter within the flow channel or chamber.In order to minimize measurement uncertainties when a calibration device is installed,it is recommended that the calibrated range should be kept to a realistic minimum, i. e.max flow less 30 to 100 mm dependant on measurement span. Ensure that the targetplate of the calibration device does not fall within the 300 mm blanking distance of thetransmitter.All calibrations should be derived to suit as installed conditions.

Mounting the transmitter above the liquid surfaceThe transmitter is supplied with a purpose made Stainless Steel mounting bracket whichshould be used to mount the transducer over the liquid surface.The bracket is designed to fit over the 1" threaded neck of the transmitter and is retainedby a locknut.Never suspend the transmitter by the cable!Use a chain or wire through the hole provided in the bracket, which is shaped to ensurethat the transmitter will hang perpendicular to the liquid surface.Check that the material of the chain or wire is corrosion resistant to the liquids and anyvapors present.

Installation


Alternatively, the bracket may be bolted to a suitable cross member above the liquidsurface. Ensure that the transmitter is perpendicular to the liquid surface to maximize thereturn echo size.

Check that the maximum liquid level will not encroach into the 0.3 m blanking zone of thetransmitter.

WiringThe transmitter is supplied with a factory fitted length of PVC sheathed two core shieldedcable which should be neatly run back to the control unit or a suitable local IP65 junctionbox.

The transmitter cable cores are identified as follows:

Red 24 V dc

Black 0 V dc

Screen Earth: Must be connected to an Intrinsi- cally Safe Earth in the non- hazardous areaif the transmitter is installed in a hazardous area. Connect to a standardearth if the transmitter is not in a hazardous area.

The cable may be cut to length on site or may be extended using an IP65 junction box,such as the Flygt Level Sensor Junction Box 83 95 05 and suitable extension cable up to atotal length of 300 m.

Where the transmitter is installed in a hazardous area, it is the responsibility of the user toensure that the cable parameters of the total length of a cable used together with theparameters of the LSU 100 are less than the safety parameters of the safety barrier.

See Additional components in the two wire loop: (page 10).

Multicore cable may be used provided that each pair within the multicore has a separateshield.

Note! As good instrumentation practice, avoid tracking the cable with cables carrying highvoltages if possible.

Additional components in the two wire loop:Safety barriers - Installation of the transmitter in hazardous area

It is the responsibility of the user to ensure a suitable Intrinsically Safe barrier is fitted in thesafe area.

The barrier must be chosen such that its output parameters U0 (Voc), I0 (Isc) and P0 areless than Ui (Vmax), li (Imax) and Pi of the LSU 100 transmitter.

For the LSU 100 transmitter, Ui = 30 V, Ii = 120 mA and Pi = 0.82 W.

In addition, the sum of the capacitance and the inductance of the transmitter and any extracable fitted must not exceed the maximum specified for the barrier chosen.

For the LSU 100 transmitter with 20 m of factory fitted cable, Ci = 5nF and Li = 27 μH.

Suitable barriers include Flygt part No. 84 30 55 (option).

Lightning / surge protection and other loop devicesIt is allowable to fit loop powered or separately powered devices in the two wire loopprovided that the transmitter receives a minimum voltage of 12 V dc at 21 mA loopcurrent. Note! In certain cases the voltage drop over the barrier may become so high thatthe 12 V minimum voltage requirement cannot be fulfilled.

It is the responsibility of the user to ensure any loop devices, if mounted in the hazardousarea, carry the requisite hazardous area certification and do not cause the systemparameters to exceed those of the safety barrier.

Installation


If the area is prone to lightning strikes or voltage surges, fitting of a suppressor device isdesirable between the transmitter and the control unit. The Flygt Level Sensor JunctionBox 83 95 05 is ideally suited for this purpose.

Wiring to allow HART communicationIf you intended to use HART digital communication with the LSU 100 transmitter, pleasecontact the nearest Xylem supplier for information.

If the transmitter is being supplied through a safety barrier, ensure the type chosen willpass HART/SMART information.

Once installed, a HART communicator can be connected across the load resistor, or acrossthe loop at any point downstream of the load resistor.

It is the responsibility of the user to ensure that any HART communicator used in thehazardous area is suitably certified for that area.

Installation


Commissioning/ProgrammingCommissioning/Programming

This section gives a very brief overview to allow checking of the installation.

When power is applied to the transmitter it will give a 4 – 20 mA signal proportional to'level' based on some factory set default values for a typical tank:

5 / 10 m 20 mA

0 m 4 mA

1

2

1. 0,3 m above max liquid surface2. Liquid surface

Bottom reference 10,3 m or 5,3 m from transducer face

Blanking distance 0,3 from transducer face

4 mA level 0 m (bottom of tank)

20 mA level 10 or 5 m (maximum liquid level)

Hence, for a liquid surface that is 1,3 m away, the current on the loop will represent a liquidlevel of (10 m – 1 m) = 9 m with a value of 18, 4 mA, given an operating range of 10 m forthe LSU 100.

It is normal in these cases for the user to program the control equipment to recognize 20mA as 10 m level and 18, 4 mA as 9 m level.

20mA – 4mA = 16mA x 9m + 4mA = 18,4 mA10m

The user may programme the LSU 100 transmitter with the specific installation details tore-range the 4-20 mA signal.

Note! A HART communicator containing a DD (Device Description) for a MSP900SH/LSU100, such as the Emerson 475 Field Communicator, will allow the computer tocommunicate with the LSU 100 transmitter, in order to re-program level values.

Commissioning/Programming


MaintenanceMaintenance

There is no routine maintenance required for the LSU 100 other than an occasional checkto ensure that the front face of the transmitter is clean and that the wiring is in goodcondition.

Maintenance


Appendix 1Safety Instructions specific to hazardous area installations

Model number covered: LSU 100.

The following instructions apply to equipment covered by Ex certificate numbers Sira09ATEX2081X, 09CSA2152611, FM 3036099 respectively:

General

a) The equipment may be used with flammable gases and vapours with apparatus groups IIA, IIB & IIC,and with temperature classes T1, T2, T3, T4, T5 & T6.

b) Installation of this equipment shall be carried out by suitably trained personnel, in accordance withthe appli cable code of practice.

c) The equipment is not intended to be repaired by the user and is to be replaced by an equivalentcertified unit. Repairs should only be carried out by the manufacturer or approved repairer.

d) If the equipment is likely to come into contact with aggressive substances, it is the responsibility ofthe user to take suitable precautions that prevent it from being adversely affected, thus ensuring thatthe type of protection is not compromised.

AggressiveSubstances

e.g. acidic liquids or gases that may attack metals or solvents that may affectpolymeric materials.

SuitablePrecautions

e.g. regular checks as part of routine inspections or establishing from thematerial's data sheet that it is resistant to specific chemicals.

e) The apparatus electronics is only certified for use in ambient temperatures in the range of -40ºC to+60ºC for T4 or -40ºC to +55ºC for T6. It should not be used outside this range.

f) It is the responsibility of the user to ensure the voltage and current limits for this equipment are notexceeded.

Technical Data

Coding (ATEX): II 1 G Ex ia IIC Ga T4 (-40°C≤Ta≤60°C)

Ex ia IIC Ga T6 (-40°C≤Ta≤55°C)

Coding (CSA): Ex ia IIC T4 (-40°C≤Ta≤60°C); T6 (-40 °C≤Ta≤55°C)

Coding (FM): IS/I/1/ABCD T6 (Ta=55°C); T4 (Ta=60°C)

IS/I/0/AEx ia IIC T6 (Ta=55°C); T4 (Ta=60°C)

Safety Parameters: Ui = 30V, Ii = 120mA, Pi = 0.82W, Li = 27μH, Ci = 5nF

Materials of construction:• PVC moulded body and front face.• PVC sheathed 2 core shielded cable.• Glass filled nylon lock nut.• 316SS hanging bracket.• Epoxy adhesive sealant.

ATEX Special conditions for safe use

g) The equipment must not be installed directly in any process where the enclosure might be chargedby the rapid flow of non-conductive media.

h) The equipment must only be cleaned with a damp cloth.

i) Do not mount the LSU100 on a structure that is subject to vibration, or in a position where damagemay be caused by impact or thermal stress.

Appendix 1


j) The equipment is not intended to be used in areas exposed to dust.

FM Special conditions for safe use

a) The transmitter must not be subjected to long-term UV-degradation, i.e. install it out of directsunlight.

FM Control Drawing, see FM Control Drawing (page 16)

European Declaration of Conformity, see #unique_29

Appendix 1


Appendix 2FM Control Drawing

Appendix 2


Xylem |’zīləm|

1) The tissue in plants that brings water upward from the roots2) A leading global water technology company

We're 12,000 people unified in a common purpose: creatinginnovative solutions to meet our world's water needs. Developing newtechnologies that will improve the way water is used, conserved, andre-used in the future is central to our work. We move, treat, analyze,and return water to the environment, and we help people use waterefficiently, in their homes, buildings, factories and farms. In more than150 countries, we have strong, long-standing relationships withcustomers who know us for our powerful combination of leadingproduct brands and applications expertise, backed by a legacy ofinnovation.

For more information on how Xylem can help you, go to xyleminc.com

Xylem Water Solutions ABGesällvägen 33174 87 SundbybergSwedenTel. +46-8-475 60 00Fax +46-8-475 69 00http://tpi.xyleminc.com

Visit our Web site for the latest version of this document andmore information

The original instruction is in English. All non-Englishinstructions are translations of the original instruction.

© 2011 Xylem Inc

894477_5.1_en.GB_2012-01_IOM_LSU100

Documents

LSU 100, Ultrasonic level transmitter · The LSU 100 ultrasonic level transmitter ... Ui=30V, Ii=120mA, P=0.82W, Li=27μH, Ci=5nF Materials of construction: • PVC moulded body and