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EsiWelma Srl 

URD20SS_en.doc - rev. 0 

CO

2

 gas detectors – URD20SS 

24/09/2010 

Gas detection systems for industrial environments 

7/8

 

Checklist after 
mechanical and 
electrical installation 
(continued)

 

Use the calibration kit to apply the gas mixture at 5000ppm of CO

2

, making sure 

that the 4...20mA output is between 7 and 9mA (theoretic value 8mA), and that the 
status LED and the pre-alarm, 1

st

 and 2

nd

 alarm threshold on the optional relay card 

switch on according to the threshold settings.  
Use the Pure Nitrogen gas cylinder to check the zero calibration. 

 

Maintenance

 

Routine 
 

Corrective 

 
 
 
 
 
 
 

Decommissioning

 

A sensor functional test should be carried out every three-six months. 

Routine maintenance involves repeating the same tests as set forth in “checklist 
after mechanical and electrical installation”.

 

If any abnormalities are found during routine sensor maintenance, return the sensor 
concerned to the supplier / installer, who in turn will send it back to the 
manufacturer. 
Sensors may need to be re-calibrated, using the 

TUL40..

 gas calibration kit and the 

TUS40

 handheld terminal, which must be connected to the sensor via the 

communication interface integrated in the cable (on the connector 

CN4)

 

For the re-calibration procedure, see the instructions supplied with the handheld 
terminal. 

Remove power from the detector, disconnect all wiring and conduits and dismount 
the housing from all the blocking systems. 
 

Warranty 

Warranty on EsiWelma products is valid for 12 months from installation date and 
no longer than 24 months from manufacturing date on the product. Installation 
data, stamp and signature on the data sheet filled in by the installer will be 
considered proof for warranty. 

 

A copy of the warranty data sheet must be sent when returning the product under 
warranty. 

 

Accessories 

UZR20.4

 Four-relay card 

TUL40..

 Gas calibration Kit 

TUS40

 Handheld terminal 

CRG40

 Gas collecting cone 

PAP40

 Powerful jets protection 

 

Dimensions and weight 

 

Dimensions (HxWxD): 155x100x60mm.                                             Weight: 0.65Kg  
 

 

 

Summary of Contents for Sensigas URD20SS

Page 1: ...etects carbon dioxide leaks or emissions in industrial environments hospitals fermentation plants greenhouses stables and more in general where carbon dioxide is stored generated or produced URD20SS sensors can be used in stand alone mode with 4 20mA output or with an optional voltage free contact relay card having the following four digital outputs Pre alarm 1st alarm threshold 2nd alarm threshol...

Page 2: ...larm by jumper selectable polarity 4 20mA output load resistor up to 200Ω at 12Vdc power supply 200Ω 700Ω at 24Vdc power supply Operating Temperature Storage Temperature 20 50 C 20 70 C Relative Humidity without condensing Operation Storage 15 90 RH 45 75 RH Operating pressure KPa 80 110 Air speed m s 6 Visual warnings Red LED visible with detector energised Dimensions and weight See dedicated sec...

Page 3: ...s that of air so it tends to collect at floor level in closed unventilated environments Therefore the sensor must be installed about 30 cm above the floor level Take into consideration the following specific installation guidelines as well as the above instructions for location of the detectors The detectors must be installed 1 where accidental gas leakages are possible 2 at least 1 5m away from h...

Page 4: ...be made by JP2 triple of jumpers to change this setting operator has to move JP2 jumpers as shown in the figure Caution if the default settings are changed the connections on the TB1 terminal board will be inverted Ref at default Ref at To set the operating mode of the 4 20mA signal it is necessary to use the 5th selector of the DIP switch at S1 in particular Proportional Threshold mode To set the...

Page 5: ...s below Step 1 Insert the connection slot provided with the relay card into the control card making sure the flexible tab is towards the main terminal board Find CN3 connector CN3 connector Connection slot flexible tab Step 2 Fit the relay card snugly and pull the flexible tab of the connection slot towards the main terminal terminal board Flexible tab Step 3 Check the position of the card Make su...

Page 6: ...al installation The sensors are factory calibrated so they normally do not require any other calibration once installed Still after installation an operational check of the sensors is recommended The detector will enter a 2 minute warm up phase after power up After this time the sensor will switch to normal operating mode but it will take about 2 hours before it reaches top performance level When ...

Page 7: ...to the supplier installer who in turn will send it back to the manufacturer Sensors may need to be re calibrated using the TUL40 gas calibration kit and the TUS40 handheld terminal which must be connected to the sensor via the communication interface integrated in the cable on the connector CN4 For the re calibration procedure see the instructions supplied with the handheld terminal Remove power f...

Page 8: ...use in explosive gas atmosphere caused by mixture of air and gas vapours flammable mist Ex nA nC d IIC T6 Types of protection complying with EN60079 0 and EN60079 15 sensor body with type of protection d in compliance with EN60079 1 BVI 07 ATEX 0033 Type examination certificate 20 C TA 50 C Operating temperature range Installation data To be filled in by Installer Installer s stamp and signature I...

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