Thermal conductivity gas sensor
The MD61 gas sensing element is manufactured based on the principle that the total thermal conductivity of a mixed gas changes with the content of the gas to be analyzed. It consists of a detection element and a compensation element paired to form two arms of a Wheatstone bridge. When encountering a gas with a thermal conductivity higher than that of air, the resistance of the detection element decreases; when encountering a gas with a thermal conductivity lower than that of air, the resistance of the detection element increases (with air as the background). The bridge output voltage changes, and this voltage variation increases proportionally with the increase in gas concentration. The compensation element serves as a reference and provides temperature compensation.
