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Use
Operation
Ordering
05/10/2020
Sensigas
Oxygen detectors
IP65 protection rating
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 URS20SI 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.
URS20SI 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 an oxygen leak or an absence of oxygen, 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: URS20SI.
For special versions, on request, please contact Customer Service.
EW0826A2_en - rev. A
Gas detection systems for industrial environments
®
nd
alarm threshold, sensor fail.
URS20SI
).
2
Oxygen detectors – URS20SI
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Related Manuals for Navim Group Company EsiWelma Sensigas URS20SI
Summary of Contents for Navim Group Company EsiWelma Sensigas URS20SI
- Page 1 Sensigas ® Oxygen detectors IP65 protection rating URS20SI 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 URS20SI detectors are used to detect oxygen excess or deficiency in non-classified areas.
- Page 2 Type of sensor Electrochemical cell Technical Detectable Gas excess deficiency characteristics Power supply 11÷28Vdc Max power consumption 2.5W 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 Sensors lifetime Sensor average lifetime (see technical characteristics) is referred to a typical usage in a pollution-free environment. Presence of a high concentration of pollutants can shorten the lifetime of the sensing element. Once the detection system starts up, it has to be supplied with energy during all the lifetime of its sensors.
- Page 4 Electrical Installation CAUTION: Make the area safe and make sure that the device power supply is off before cabling and configuration operations. Install the sensor in compliance with laws in force. 1“ NPT cable glands are used for cable entry. Ground the sensor using the internal grounding system.
- Page 5 Mechanical installation The control card can be expanded with a relay card inserted into a dedicated connector CN3 with four SPDT relays that will be activated under the following of the optional relay conditions: pre-alarm, 1 threshold alarm 2 threshold alarm and sensor fail, and card relative LED alerts.
- Page 6 Electrical installation of After mechanically installing the relay card, it is necessary to configure it electrically, the optional relay card selecting the relay operating mode and the type of contact desired on the terminal board (NC or NO). A pair of extractable terminals is available for each relay; the type of contact (NC or Selecting the type of NO) to be associated with them can be selected using the JP1…JP4 jumpers.
- Page 7 Since the sensor scale is between 0…...30% O ) the 4…...20mA Checklist after , in air (20.9% O mechanical and output must be set between 14 and 16mA (theoretic value 15.1mA). electrical installation Use the calibration kit to apply the gas mixture at 4% of CO , making sure the (continued) 4...20mA output is between 5 and 7mA (theoretic value 6.1mA);...
- Page 8 Installation data Installer's stamp and To be filled in by Installer signature Installation site: Product order number: Part Number: Manufacturing date: Installation date: Replacement date: Routine checks To be filled in by Installer / Service Personnel Signature Remarks …………………………………………………………………………………………………………….. …………………………………………………………………………………………………………….. ……………………………………………………………………………………………………………..
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