Gas sensor cross-talk ---- gas detector shortcomings
It must be emphasized that so far there is no gas sensor that is effective for a particular gas, that is to say, any gas sensor is not yet effective for the detection of a specific gas, for example, a gas sensor labeled to detect carbon monoxide, if there is a high concentration of hydrogen in the detecting environment, then the hydrogen may also be in the sensor, a reaction occurs to get a higher than the actual carbon monoxide concentration of the signal, which is called the sensor cross-interference. sensor cross-talk. It is the manufacturer's task to minimize this cross-talk by various physical or chemical means, e.g. by using filter membranes and different circuit parameters so that the reaction of non-tested gases is reduced to a *minimum*.
On the other hand, cross-talk can also provide some convenience for instrumentation in some cases. For example, a carbon monoxide detector can be used to detect hydrogen, provided of course that there is only hydrogen and no carbon monoxide present in the environment, and the sensor needs to be calibrated with hydrogen. Characteristics of the manufactured, can detect carbon monoxide and hydrogen sulfide at the same time, to achieve the purpose of a sensor at the same time to detect two gases.
Due to technical limitations, gas sensors must also undergo constant calibration calibration to obtain more accurate measurements. General technical requirements** before each use of the instrument must be carried out on the function of the test (pump test), if the instrument's measurement results in the instrument's error range, the instrument can be used normally, and once the test results deviate from the normal error range, the instrument must be re-calibrated in order to use.
