EsiWelma Srl
URS40SL_en.doc - rev. 0
Oxygen detectors – URS40SL
11/04/2011
Gas detection systems for industrial environments
1/4
Oxygen detectors
IP55 protection rating
URS40SL
11…14Vdc 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 URS20SL detectors are used to detect oxygen excess or deficiency in non-
classified areas.
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.
URS20SL detectors transmit data from a local bus connected with their Control Unit,
which acts as the master unit of the gas detection system.
Operation
If there is an oxygen leak or an absence of oxygen, the detector compares the
measured concentration value with the threshold limit setpoints and energises the
system relays if associate.
Alarm information is transmitted to the Control Unit, which energises its own internal
relay module (MR0) and the remote Relay and Display modules depending on the
associations.
Ordering
To order, simply state the part number:
URS40SL
.
For special versions, on request, please contact Customer Service.
