EW0826A4_en - rev. A
Oxygen detectors
–
URS20SS
05/10/2020
Gas detection systems for industrial environments
1/8
Sensigas
®
Oxygen detectors
ATEX
II 3G Ex nA nC d IIC T6 Gb certified
URS20SS
Sssssss
11…28Vdc power supply.
Electrochemical cell sensor designed for the detection of oxygen (O
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 URS20SS detectors are used to detect oxygen excess or deficiency in hazardous
(classified) areas of industrial environments and thermal power stations.
An
oxygen excess
forms if it leaks in hospitals, laboratories, welding centres and, more
in general, where oxygen is stored.
Oxygen deficiency
is an indirect measurement of the presence of other explosive or
asphyxiant
gases that deplete the oxygen in the air.
URS20SS 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:
URS20SS
.
For special versions, on request, please contact Customer Service.
