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Use
Operation
Ordering
05/10/2020
Sensigas
Oxygen detectors
ATEX
II 3G Ex nA nC d IIC T6 Gb certified
11...14Vdc 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 URS40SS 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
gases that deplete the oxygen in the air.
asphyxiant
URS40SS detectors transmit data from a local bus connected with their Control Unit,
which acts as the master unit of the gas detection system.
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.
To order, simply state the part number: URS40SS.
For special versions, on request, please contact Customer Service.
EW0526A4_en - rev. A
Gas detection systems for industrial environments
®
URS40SS
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Oxygen detectors – URS40SS
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Related Manuals for Navim Group Company EsiWelma Sensigas URS40SS
Summary of Contents for Navim Group Company EsiWelma Sensigas URS40SS
- Page 1 Sensigas ® Oxygen detectors ATEX II 3G Ex nA nC d IIC T6 Gb certified URS40SS 11…14Vdc 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.
- Page 2 Type of sensor Electrochemical cell Technical Detectable Gas excess deficiency characteristics Power supply 11÷14Vdc Max power consumption 0,7W 0…30% O Measuring range 2,5% of full scale range (in air) Precision 2,5% of full scale range Repeatability Measurement resolution 0.1% O Microprocessor resolution 1024 points (10 bit)
- Page 3 Mechanical Oxygen excess Since oxygen weighs more or less the same as air, unless there is forced or natural air Installation circulation, it tends to spread at the point of the leak. So, the excess oxygen detectors must be installed near any likely leakage points, in order to detect the excess oxygen as quickly as possible.
- Page 4 Checklist after Before using the sensor it must be recognised by the Control Unit through an assignment operation (refer to the manual of the aforesaid Control Unit for correct execution). mechanical and electrical installation The sensors are factory calibrated so they normally do not require any other calibration once installed.
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