One of the most common sources of flame and gas detection system failure is power supply interruption and disturbance. Power supply specifications of an instrument refer to the voltage that must appear at the instrument power terminals, not the power supply rated output. There are many factors that impact voltage reaching the fire or gas detector, any one of which may cause an unwanted shutdown or damage to the instrument. The most fundamental factor to consider is wire resistance between the power supply and the device but there many other factors.
The most fundamental factor to consider is wire resistance between the power supply and the device but there many other factors.
The total power or voltage required to be supplied per instrument is the “Power required by the Instrument” plus the “Power loss in the wiring”. Perhaps surprisingly, on installations with long wiring runs the “Power loss in the wiring” could exceed the “Power required by the Instrument”.
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I have a question: How long do Net Safety Combustible gas sensors last?
In reply to P Gupta:
Net Safety catalytic bead and infrared sensors have a 5 year warranty, we recommend replacing the sensor shortly after this time. Avoiding exposure to such environmental factors as dirt, humidity, heat, etc., can extend sensor life.
In reply to Jaydeep Mukherjee:
You can use the Gas detectors as long as they are calibrated sucessfully using Calibration Gas ( 50% LEL) the sensor is good for use, if the detector cannot be calibrated it should be replaced, typical life time of IR sensor is 8 to 10 years, typical life time for Cat bease is 5 to 6 years ... however this may change depending upon application, temperature, dust , etc
Xavier D'souza | Business Development Manager Analytical & DetectionEmerson Automation Solutions | Canada