Product Data Sheet DS1120

Flow Alarms For Glass VA

FFLLOOWW

FLOSCAN INFRA-REDFLOW ALARM SYSTEMS

Floscan sensors use an infra-red beam across theglass flowtube of a Variable Area (VA) flowmeter.Passage of the float between the sensor arms isdetected, and logic within the electronics determineswhether the float is above or below the sensorposition. Electronics inside the sensor module givesan open collector transistor output, suitable forexternal logic circuits.

Suitable for all gas flows, and liquid flows where thefloat is visible, the sensor is clipped to the back of theflowmeter frame, typically on a Platon NG/NGX Series(normal 100mm scale) or LG/LGX series (miniature30mm scale) VA meter.

Movement up and down the frame allows the sensorto provide a flow alarm at any point on the tube scale,as required. The sensor can also be supplied onPlaton GU or SGUV style flowmeters.

The optional mains interface and relay module isused to provide the DC power needed to drive thesensor electronics, plus a SPCO 8 Amp mains relayoutput. This relay acts as a slave to the transistoroutput from the sensor module. Each Floscan relaymodule has two output relays, and can be used tomonitor two separate alarm sensors.

FEATURES

• High or Low flow alarm

• Intelligent: Knows whether float above or

below sensor

• Adjustable over full range of flowtube

• Suitable for normal (NG/NGX) or miniature

(LG/LGX) flowmeters

• DC output direct to standard logic circuits

• Optional mains interface relay module

DS1120 Issue 2: 02.02.06 Page 1 of 4

+43 1 706 43 000 www.mess-regeltechnik.at www.platon-direct.eu

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COMPATIBILITY

1. Frames

All standard GIR sensors are supplied with afitting kit suitable for use on Platon NG, LG, NGX,or LGX style frames. (See Data sheet DS1112 orDS1115) The sensor can be supplied fitted withinPlaton GU or SGUV style housings.

2. Flow Fluid

GIR sensors are supplied set up for the flowtubesize specified and either liquid or gas as theflowing medium. The sensors are not normallyinterchangeable between different sizedflowtubes.

3. Flow Scales

For size 1 and 2 flowtubes, the flow scale artworkserial number (eg CA 141002) must be issue C orlater (first digit). Otherwise the scale marks mayinterfere with the infra-red beam. For size 3flowtubes, GIR sensors will work correctly on allpreviously supplied scale artworks.

Consult the sales office and specify flowtube andalarm sensor module together.

DS1120 Issue 1: 02.02.06 Page 2 of 4

SPECIFICATION

Sensor Type IR Beam break detectionDirection Logic Position of float above/below sensor established

on first detection of float after power upSetting Position Held by spring clip anywhere in flowtube

operating rangeTemperature -5 to +50oCEnvironment IP44 with cable exit downwardsDimensions 22 x 66 x 30 (HxWxD)

5mm space needed behind frame. Spacersprovided for use on NG/LG frames

Sensor Cable 2m, 3 core screenedCable Functions Red - positive

Black - OV commonWhite - Transistor output

Voltage Supply 12V nominal, 8V - 26VDC range at 25mAOutput (Sensor Open circuit for low flow alarm, conducts for flowPositioned with above switch pointCable Exit Down)Switch Points For falling float, top edge of float at centre line of

sensor. For rising float, switching occurs when baseof float passes centre line

PRINCIPLE OF OPERATION

The Floscan sensor module positions an infra-red

detector beam accurately side to side across the

flowtube, at a pre-set level. The beam is transmitted

through the flowmeter cover and glass tube walls,

but is broken by the presence of the float. Two IR

sensitive detectors, one above the other, monitor the

passage of the float shadow: direction of float travel

is determined by the order in which the detectors

emerge from the shadow. This allows the sensor to

remember whether the float is above or below the

sensor position.

Because the NGX/NG/LGX/LG series frames are

compact units, the Floscan module is designed to be

mounted externally. Alignment is maintained by

connecting the two transmitter/receiver lobes

together around the back of the flowmeter frame,

where the whole unit clips into the extrusion groves.

For panel mounted flowmeters, this means the frame

must be spaced forwards from the panel by approx

5mm – spacers are provided.

Floscan GIR sensorshown clipped into theback of theNGX/LGX/NG/LG SeriesFlowmeter Frame

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DS1120 Issue 1: 02.02.06 Page 3 of 4

MODEL CODES GIR 2 LTypical

Floscan Sensor

Tube/Frame Size1 = Size 1 flowtube2 = Size 2 flowtube3 = Size 3 flowtube

Fluid TypeL = LiquidG = Gas

All GIR Flowscan sensors are supplied with a fitting kitof retaining spring and two spacers for panelmounting of NGX/LGX and NG/LG frames.

OPTION – RELAY MODULE

The Floscan alarm optional mains power and slaverelay output module is a DIN rail/surface mountedunit that provides DC power for one or two Floscansensors.

Each sensor output drives a relay in the module,allowing external signalling via volt free contacts.

The two Floscan sensors can be high or low flowalarms (dictated by the sensor orientation), on thesame flowmeter tube, or on separate flowmeters.“Energised relay normal” conditions are displayed byLED indicators.

OPTION - RELAY MODULE

• SPCO Relay Output

• Mains AC or DC Power

• LED Indicators

• Drives Two Sensors

OUTPUT LOGIC: For normal installation ofsensor, with cable exitdownwards, the outputtransistor conducts for flowrate above the set points.

START-UP LOGIC: On power-up, the sensor hasno information as to whetherthe float is above or below thesensor. The output state istherefore indeterminate, andcan represent high or lowflow. Once the float haspassed the sensor for the firsttime, the memory logic istriggered and the outputvalidated.

GIR Module

Sensor

Red+ Volt

O/P

Common

Earth

White

Black

Screen

EXTERNAL CONNECTIONS

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DS1120 Issue 2: 02.02.06 Page 4 of 4

RELAY MODULE OPTION

Mains power interfaceSuitable for one or two Floscan sensors

HAZARDOUS AREA INSTALLATION

The GIR sensor is approved as intrinsically safe to EExia IIC T4 Copies of CENELEC certificate Ex 96D2091.

When used in hazardous areas the GIR sensor shouldbe used with a 12Vdc supply, protected by 15 volt100 ohm shunt diode safety barriers as - per RMRCdrawing 2-W142.

Because the GIR module requires 8V & 25mA forcorrect operation, the barrier chosen must have anend to end resistance of below 16ohms. (A suitablebarrier is the MTL767, with 155 ohm resistance).

The Platon relay module 58384 can be used toprovide a control room interface, on the safe side ofzener shunt diode safety barrier.

SPECIFICATION

Mains Power Input 20-256 Vac, 50/60HzSensor Power Output 24-370 VdcSensor Power Output +12VDC, 12mA (suitable for GIR Alarm

modules)+24VDC, 25mA (suitable for GMTXDtransmitter)

Floscan Inputs Two channel input, independentRelay Output 8 Amp, 250VAC maximum SPCO action

De-energised for sensor output circuit,typically a low flow condition

LED’s Green LED’s for no alarm, (relays energised)Yellow LED for power onRed LED’s to indicate that float position isunknown (occurs on switch-on before floatpasses sensor)

Temperature -5 to +50oCDimensions 70 x 75 x 112 HighTerminal Covers When fitted over terminals protection rating

IP20Order Code 58384 Floscan Alarm module.

CONNECTIONS

L Live Power

N Neutral Power

CH1 Relay output from Sensor 1

CH2 Relay output from Sensor 2

E Earth bond

SCR Sensor Cable Screen

S1 Sensor 1 input

S2 Sensor 2 input

OV DC Common (OV)

+12V Sensor supply (12V)

+24V Sensor supply (24V)

Every effort has been made during the preparation of this document to ensure the accuracy of statements and specifications. However, we do not accept liability for damage, injury, loss orexpense caused by errors or omissions made. We reserve the right to withdraw or amend products or documentation without notice..

LICO Electronics GmbH Klederinger Str. 31

A-2320 Kledering, Austria office@lico.at www.lico.at Tel. +43 1 706 43 00

www.platon-direct.eu

FFLLOOWWOperation & Maintenance Manual OMM1042

Floscan Alarm Type GIR

OMM1042 Issue 5: 07.07.06 Page 1 of 10

INFRA-RED FLOW ALARM SENSOR FORGLASS TUBE VA FLOWMETERS

INTRODUCTION

The Floscan flow alarm sensor type GIR is an infra redsensor module which monitors the passage of avariable area flowmeter float through the sensor,giving an electrical flow alarm output. One or twosensors can be installed on a Platon Flowtube,typically on a NG or LG series frame, held in place bya spring clip located in the extrusion profile at theback of the frame. GIR units can also be suppliedfitted in GU housings.

The sensor monitors the float movement toremember whether the float is above or below thesensor location - the electronics can only give areliable output after the first detection of this floatmovement following power up: it loses the memoryon power down.

The sensor is external to the flowmeter cover on NGand LG series frames, and requires that the back ofthe frame is spaced from any panel by approximately5mm. This is achieved by fitting the threaded spacers(provided) onto the frame mounting studs.

Once fitted, the sensor can be slid up and down tothe required position on the flowtube. The normaloutput is for a low flow alarm, where the cable exitsdownwards. For a high flow alarm, the sensor can berotated through 180o with the cable exiting upwards.Note that in this orientation the IP44 rating of theunit will be reduced.

INSPECTION

1. Remove from packaging and check there is nophysical damage.

2. Check that the following components areenclosed:

2 x M5 threaded spacers1 x Spring clip 1 x Sensor module

3. Check that the GIR part number identifies that ithas been set up for use on the tube size and fluidto be used. Part numbering is as follows:

GIR 1 G

Tube size Fluid1 = Glass Tube size 1 G = Gas2 = Glass Tube size 2 L = Liquid3 = Glass Tube size 3

4. Note that GIR modules should only be used withthe glass tube supplied with the order. Olderglass tubes may have scale markings whichinterfere with the infra-red transmission paths(see Maintenance and Fault Finding section).

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OMM1042 Issue 5: 07.07.06 Page 2 of 10

Key for figures 1, 2 and 3

1 GIR module housing

2 Infra-red transmitter

3 NG or LG series flowmeter cover

4 GTF glass flow tube

5 Infra-red receivers (2)

6 Plane of back of flowmeter frame

7 Spring retaining clip

8 Spacer fitted on flowmeter mounting

stud to space from a panel

9 Flowmeter frame

10 GIR external cable

11 Safety relief vent (for discharge of fluids

should a tube fail)

Figure 2 - Back view on section ‘A-A’

DIMENSIONS AND POSITIONING

Figure 1 - Plan view of GIR sensor fitted to NG/LG flowmeter frame.

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OMM1042 Issue 5: 07.07.06 Page 3 of 10

Figure 3 - GIR Module with clip fitted

SENSOR INTERFACE

Normal Low Flow Alarm

The sensor is powered by a d.c. voltage (12/24Vnominal) and provides an open collector transistoroutput capable of switching up to 50mA from a d.c.supply (maximum 30V).

This output is conducting (i.e. a short circuit) for flowshigher than the set point, when the cable exits fromthe base of the GIR sensor once it is mounted on theflowtube. This is typically a low flow alarm, since lowflows give a non-conducting or open circuit output.

Interface Module (refer to OMM 1043)

When used with the Floscan alarm mains interfacemodule (58384) the conducting transistor outputstate described above will energise the Floscan alarmrelay and light the front panel green LED. This istherefore a failsafe low flow alarm, since power orcable failure will cause the relay to revert to the“alarm” state.

High Flow Alarm

If it is required that the conducting transistor stateshould occur at low flows, and that high flowconditions should give an open circuit/no currentalarm, the GIR sensor module can be inverted on theflowmeter frame. In this new orientation, the cablewill exit from the top face of the sensor module. Notethat in this orientation the IP44 rating of the unit willbe reduced.

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OMM1042 Issue 5: 07.07.06 Page 4 of 10

INSTALLATION

Orientation

Decide whether to mount the sensor in its normalorientation, or reversed (see Sensor Interface section)for the required output signal.

Panel Mounting

The flowmeter frame can be mounted on a verticalpanel if required, with the alarm sensor still fitted andadjustable. To achieve this, it will be necessary tospace the flowmeter frame from the panel face by atleast 5mm: spacers are provided to fit to themounting studs. It will be necessary to fit the sensorto the flowmeter frame before installing theflowmeter against the panel. The maximum panelthickness is reduced compared to the normal NG/LGflowmeter, because of the spacing away from thesurface. Typically, the maximum panel thicknesspossible with an alarm is 4mm.

Installation

The sensor has been tested and adjusted to performbest with the spring retaining clip mounted on theopposite side of the flowmeter frame to the cableexit from the sensor. It is easiest to install the springclip and sensor with the flowmeter face down, in ahorizontal plane. The spring clip and sensor are fittedseparately - they are not glued together in any way.

1. Place the spring clip inside the back of theflowmeter frame, with the two smallest (angled)projections located in the groove in the extrusion(see Figure 2).

2. Place the sensor module, with the sensor lobesdownwards to the front of the flowmeter, over thespring clip.

3. By tipping the flowmeter to make the spring clipstay in the extrusion groove, the sensor centralblock can be located behind the flat part of thespring clip. Gentle pressure will then need to beapplied on the centre back of the sensor to pressthe “ears” on the moulding past the outer lip ofthe back of the flowmeter frame. The sensor willthen be held in place.

4. If it is necessary to release the sensor, the “ears”have to be forced back over these edges. This iseasier to achieve from the bottom edge of thesensor (the edge where the cable exits) - liftingthis edge first.

5. The flowmeter can be returned to the vertical andthe sensor moved along the extrusion to therequired switch point. The nominal switch pointis located on the centre line of the sensor lobes.This will give the correct low flow alarm switchpoint.

The high flow alarm switch point occurs when thebottom of the float is at the centre line of thealarm sensor lobes. The sensor therefore needs tobe positioned with its centre line below therequired set point, by a distance corresponding tothe float length.

ELECTRICAL CONNECTIONS (Refer to Figure 4)

RED WIRE (+V)

This is the d.c. power supply to the sensor circuit.

Connect to a d.c. supply between 8V and 26V (positive with respect to the common terminal).

Nominal current drawn is 25mA.

WHITE WIRE (O/P)

This is the “output” or “signal” connection.

It is from an “open collector’ type output.

The source transistor can be used to switch up to50mA from up to a 30V d.c. positive supply withrespect to the common terminal.

BLACK WIRE (Common)

This is the common return line for the powersupply and the output signal.

This would typically be referred to as “0 Volts”.

CABLE SCREEN

This should be connected to earth to provide theshielding required for EMC protection.

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OMM1042 Issue 5: 07.07.06 Page 5 of 10

Figure 5 - External Load Connections

Figure 4 - Electrical Connections

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OMM1042 Issue 5: 07.07.06 Page 6 of 10

OUTPUT PROTECTION

Ex factory Protection

The load connected to the output cable from asuitable d.c. supply must be sufficient to limit thecurrent drawn to below 50mA. Currents exceeding50mA through the transistor will cause damage - thetransistor will fail and the warranty will beinvalidated.

Load Calculation

The external circuit must be configured as per Figure5.

Minimum load, R = V/50mA

For a typical power rail of 24V, this calculationshows that the load resistance, R should be 480 Ωminimum.

MAINTENANCE & FAULT FINDING

Maintenance

Regular maintenance can be described as:

1. Check that the sides of the flowmeterpolycarbonate cover are clean and scratch free(inside & outside).

2. Check that the glass flowtube is clean (inside &outside) and positioned with the scale markingsat the front of the meter.

3. Check that the GIR sensor is properly clipped tothe flowmeter frame, to switch at the correct flowrate, and that the internal faces of the sensor are clean. If fitted, the attenuation labelshould be stuck in place over the receiver face.

4. Only clean with a cloth dampened with water soas to avoid electrostatic risk.

5. There are no user serviceable parts.

Fault Finding

1. Check the sensor is correctly fitted and that theflowtube has the scale towards the front of themeter.

2. Clean the flowmeter cover.

3. Check that the glass flow tube has not beenreplaced with an older spare. Older GTF tubessize 1 & 2 had scale markings which couldinterfere with the GIR sensor: suitable new tubeshave scale codes starting with letter C, such asCA141002. Codes starting B or 1 are not suitable.

4. Check that the GIR part number corresponds tothe float and fluid in use - this determines theattenuator label type which is fitted on the GIRreceiver face. Ensure that the label is undamagedand stuck in place.

5. Remove any bright source of light (which mighthave an infra-red component) which couldsaturate the receiver amplifiers. For example, 75Watt filament bulbs must not be closer than 1mto the flowmeter. A light shield (42532) can bepurchased to help with this but it will obscurethe scale at the alarm set point.

6. Check the external load in the output circuit.Shorting of this load would damage the outputtransistor.

7. Check the power supply connections.

8. Check the output cable for visible damage orkinking, which could have broken theconductors.

9. Simulate float movement past the sensor using astrip of paper or card, between the sensor andflowmeter cover.

10. No repair is possible on the sensor electronics, soa faulty unit can only be replaced completely.

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OMM1042 Issue 5: 07.07.06 Page 7 of 10

HAZARDOUS AREA INSTALLATION

The GIR sensor is approved intrinsically safe to EEx iaIIC T4, a copy of the EC Type Examination certificateis attached, Sira 03ATEX2401X.

When used in a hazardous area, the GIR sensorshould be used with a 12V d.c. supply, protected by a15V 100Ω shunt diode safety barrier as per Figure 6.Because the GIR module requires 8V and 25mA forcorrect operation, the barrier chosen must have endto end resistance below 160Ω. A suitable barrier isthe MTL 767, with 155Ω resistance.

The Floscan mains relay module (Platon part 58384),can still be used to provide a control room interface,on the safe side of the zener barrier.

Install the equipment following Figure 6 and theassociated notes.

Aggressive Substances

If the equipment is likely to come into contact withaggressive substances, then it is the responsibility ofthe user to take suitable precautions that prevent itfrom being adversely affected, thus ensuring that thetype of protection is not compromised.

Aggressive - e.g. acidic liquids or gases thatsubstances may attack metals, or solvents

that may affect polymericmaterials

Suitable - e.g. regular checks as part ofprecautions routine inspections or es-

tablishing from the material’sdata sheet that it is resistant tospecific chemicals

SPECIAL CONDITIONS FOR SAFE USE

The certificate number has an ‘X’ suffix, whichindicates that special conditions of installation anduse apply. Those installing or inspecting thisequipment must have access to the contents of thecertificate.

The following special condition of certificationapplies:

Parts of the enclosure are non-conducting andmay generate an ignition-capable level ofelectrostatic charge under certain extremeconditions. The user should ensure that theequipment is not installed or used in a locationwhere it may be subjected to external conditions(such as high-pressure steam) which might causea build-up of electrostatic charge on non-conducting surfaces. Additionally, cleaning of theequipment should be done only with a clothdampened with water.

Safety Related Devices

The equipment has not been assessed as a safetydevice as defined by the ATEX directive 94/9/EC.

Other Information

II 1G, EEx ia IIC T4, Sira 03ATEX2401X

The equipment may be used with flammablegases and vapours with apparatus groups IIA,IIB and IIC and with temperature classes T1, T2,T3 and T4

The equipment is only certified for use inambient temperatures in the range -20oC to+40oC and should not be used outside this range

The GIR Flow Alarm Sensor is intended to beused in areas that are protected from windblown dust and rain

For manuals in other EU languages, pleasecontact: sales@roxspur.com

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OMM1042 Issue 5: 07.07.06 Page 8 of 10

OMM1042 Issue 5: 07.07.06 Page 9 of 10

OMM1042 Issue 5: 07.07.06 Page 10 of 10

Figure 6 - Intrinsically Safe Installation (2-W142)

1-4 Campbell Court, Bramley,Tadley, Hampshire, RG26 5EG, EnglandTel: +44(0)1256 884901 Fax: +44(0)1256 882986email: sales@roxspur.com www.roxspur.com

Every effort has been made during the preparation of this document to ensure the accuracy of statements and specifications. However, we do not accept liability for damage, injury, loss orexpense caused by errors or omissions made. We reserve the right to withdraw or amend products or documentation without notice.

Head Office:2 Downgaterive, Sheffield, S4 8BT, England

Tel: +44(0)114 244 2521 Fax:+ LICO Electronics GmbH

Klederinger Str. 31 A-2320 Kledering, Austria office@lico.at www.lico.at

Tel. +43 1 706 43 00

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FFLLOOWWOperation & Maintenance Manual OMM1043

Floscan Relay Module 58384

OMM1043 Issue 2: 01.07.03 Page 1 of 2

INSTALLATION

a) Remove from the packaging and check thatthe unit is undamaged.

b) Mount the unit as required. This can becarried out using standard 35mm DIN rail (DINEN 50022-35) or by screw mounting.

c) Electrical connections shall be made usingmaximum conductor size of 2.5mm2. Twoconnections may be made to each terminal.Refer to examples for sensor connection.Mains power connections shall be within theranges 20 to 256V a.c, 50/60 Hz or 24 to 370Vd.c. These shall be made to the L and Nterminals. The E terminal must be connectedto Earth.

d) Once the cable connections have been made,the terminals should be covered with thesupplied protective covers, to achieve IP20protection. Note: This unit is designed formounting inside a larger enclosure. Highvoltage connections should not be exposedunless isolated.

e) The output relays are rated to 250V/8A. Theconditions shown on the unit are stated for de-energised modes, ie power down or opencircuit sensor (alarm state). When used withthe GIR flow sensor, in normal usage thiscorresponds to low flow conditions.

f) The nominal input power required by this unitis 5 watts.

OPERATION

Upon power up, the “set up” lights will illuminate.These are designed for use with Platon GIRFloscan Alarm sensors (see OMM1042). Whenilluminated, this shows that there is no informationabout whether the float is above or below thesensor, so the alarm relay output state may beinvalid. After the float passes the sensor for thefirst time, the memory logic is valid and the “setup” light will extinguish. The “set up” LED can beignored for other applications.

DIMENSIONS ANDCONNECTIONS

35mmfor DIN rail

60

74

50

60

70

Mains Power Channel 1 Relay Channel 2 Relay

OMM1043 Issue 2: 01.07.03 Page 2 of 2

Sensor

GIR Sensor FLOSCAN RELAY MODULE

+ 12V

S1 for Channel 1S2 for Channel 2

0V

SCR

Red

White

Black

Screen58384

FLOSCAN RELAY MODULE

S1 for Channel 1S2 for Channel 2

0V58384

GMTXD Vampire FLOSCAN RELAY MODULE

+ 24V

S2 (Channel 2) Low Alarm

0V

SCR58384

HighFlow

LowFlow

NO

NO

COM

COM

+-

4-20mACurrentSink

Connections to4-20mACurrent monitor

S1 (Channel 1) High Alarm

Screen

a) Figure 1, GIR Sensor Connection

Examples:

b) Figure 2, Mechanical Switch Connection

c) Figure 3, GMTXD Vampire Connection

The Platon Vampire d.c. powered flow transmitter (see OMM1033) can be powered from the Floscan relay module, and the alarmoutputs used to drive the relays. Note that current sensing for the flow analogue output must be in the 24V line.

ELECTRICAL CHARACTERISTICS

a) S1 and S2 are internally connected to 12V via 10KΩ resistors.b) The maximum output currents for the 12V and 24V supplies are 120mA and 25mA respectively.

MAINTENANCE

This unit should not normally require any attention, but if any problems occur, check the following:

a) Isolate the power supply and then check that all connections are made correctly and that the terminal screwsare tightened. The power On LED (amber) should be lit when mains power is connected.

b) Use a voltmeter to check the output voltage supplies, taking care not to make contact with any high voltageconnections.

c) Disconnect S1 and S2 and simulate the input signals by connecting/disconnecting them directly to 0V. Relaysare energised and alarm status (green) LED’s are lit when the S1/S2 terminals are shorted to 0V.

d) The mains fuse can be located, once power is disconnected and the unit is isolated, by sliding the unit fromthe housing by about 30mm. It is a 20mm T1.6A 250V rated fuse, positioned below the Live “L” terminal.

1-4 Campbell Court, Bramley,Tadley, Hampshire, RG26 5EG, EnglandTel: +44(0)1256 884901 Fax: +44(0)1256 882986email: sales@roxspur.com www.roxspur.com

Every effort has been made during the preparation of this document to ensure the accuracy of statements and specifications. However, we do not accept liability for damage, injury, loss orexpense caused by errors or omissions made. We reserve the right to withdraw or amend products or documentation without notice.

Head Office:2 Downgaterive, Sheffield, S4 8BT, England

Tel: +44(0)114 244 2521 Fax:+ LICO Electronics GmbH

Klederinger Str. 31 A-2320 Kledering, Austria office@lico.at www.lico.at

Tel. +43 1 706 43 00

www.mess-regeltechnik.at www.platon-direct.eu