Navim Group Company EsiWelma Sensigas URS20SS Quick Start Manual

Use
Operation
Ordering
05/10/2020
Sensigas
Oxygen detectors
ATEX II 3G Ex nA nC d IIC T6 Gb certified
11...28Vdc power supply.
Electrochemical cell sensor designed for the detection of oxygen (O
Up to three alarm thresholds plus sensing element fail.
LED on sensing element body to indicate operating status.
Automatic countdown of sensor life.
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:
st
- Pre-alarm, 1 alarm threshold, 2
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.
To order, simply state the part number: URS20SS.
For special versions, on request, please contact Customer Service.
EW0826A4_en - rev. A
Gas detection systems for industrial environments
®
nd
alarm threshold, sensor fail.
URS20SS
).
2
Oxygen detectors – URS20SS
1/8