Catalytic Combustion Sensor for Gas Detectors
This sensor is prepared with a high-temperature resistant catalyst layer on the surface of a platinum resistor. At a certain temperature, combustible gases catalyze combustion on its surface. Combustion is a function of the concentration of combustible gases as the temperature of the platinum resistor increases and the resistance changes.
Catalytic combustion gas sensors selectively detect flammable gases: anything that can burn can be detected; Anything that cannot burn has no response from the sensor. Of course, there are many exceptions to the statement 'anything that can burn can be detected', but overall, the above selectivity is valid.
Catalytic combustion gas sensors have accurate measurement, fast response, and long lifespan. The output of sensors is directly related to the explosion hazard of the environment and is a dominant type of sensor in the field of detection.
Disadvantage: No selectivity within the flammable gas range. Working in a dark environment poses a risk of ignition and explosion. Most organic vapors have a toxic effect on sensors.
Pay attention to the concentration measurement range of the testing instrument:
All types of toxic and harmful gas detectors have their fixed detection range. Only by completing the measurement within its measuring range can the instrument ensure accurate measurement. However, measuring beyond the measurement range for a long time may cause significant damage to the sensor.
For example, if the LEL detector is accidentally used in an environment with more than 100% LEL, it may completely burn out the sensor. Toxic gas detectors, when used at high concentrations for extended periods of time, can also cause damage. Therefore, if a fixed instrument emits an over limit signal during use, the measurement circuit should be immediately turned off to ensure the safety of the sensor.
