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
