Fixed Gas Detection System (Instrumentation)

A wire coil is coated with a catalyst-coated glass or ceramic material and is electrically heated to a temperature that allows it to burn (catalyze) the gas being monitored, releasing heat and increasing the temperature of the wire. As the temperature of the wire increases, so does its electrical resistance.
This resistance is measured by a Wheatstone Bridge circuit and the resulting measurement is converted to an electrical signal used by gas detectors.
A second sensor, the compensator, is used to compensate for temperature, pressure, and humidity.

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POINT GAS DETECTION

Principale Of Operation

Uses a catalytic bead to oxidize combustible gas, a Wheatstone Bridge converts the resulting change in resistance into a corresponding sensor signal.

Advantages

  Long life, less sensitive to temperature, humidity. Condensation and pressure changes, high accuracy, fast response, monitors.
  A wide range of combustible gases and vapors in air. Available as Standard (ST), Poison Resistant (PRP), High Temperature (HT) versions