EsiWelma Srl
URD20SS_en.doc - rev. 0
CO
2
gas detectors – URD20SS
24/09/2010
Gas detection systems for industrial environments
1/8
Gas detectors
Carbon dioxide (CO
2
)
ATEX II 3G Ex nA nC d IIC T6 certified
URD20SS
11…28Vdc power supply.
Nondispersive infrared (NDIR) sensor designed for the detection of carbon dioxide
(CO
2
).
Up to three alarm thresholds plus sensing element fail.
LED on sensing element body to indicate operating status.
Automatic countdown of sensor life.
Use
The URD20SS detectors are used to detect the presence of carbon dioxide (CO
2
), in
areas classified as Zone 2.
It detects 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, 1
st
alarm threshold, 2
nd
alarm threshold, sensor fail.
Operation
If there is a gas leakage, the detector compares the measured concentration value
with the threshold limit setpoints and energises the associated relays. Information on
the measured concentration value is always at the 4…20mA output.
Ordering
To order, simply state the part number:
URD20SS
.
For special versions, on request, please contact Customer Service.
