How to calibrate a gas detector?
Gas detectors, like other analytical and detection instruments, are measured using a relative comparison method: first, the instrument is calibrated with a zero gas and a standard concentration of gas, and the standard curve is stored in the instrument. During the measurement, the instrument compares the electrical signal generated by the gas concentration to the electrical signal of the standard concentration, and calculates the accurate gas concentration value. Therefore, zero calibration of the instrument at any time and frequent calibration of the instrument are essential tasks to ensure accurate measurement. It should be noted that many gas detectors can currently replace their detection sensors, but this does not mean that a detector can be equipped with different detector probes at any time.
Whenever a gas detector is replaced with a probe, in addition to requiring a certain activation time for the sensor, the instrument must also be recalibrated. In addition, it is recommended to conduct response testing on the standard gas used in various instruments before using gas detectors to ensure that the instruments truly play a protective role. If this type of instrument is used as an alarm in an open workplace, for example, a portable diffusion gas detector can be used because it can continuously, real-time, and accurately display the concentration of toxic and harmful gases on site. A fixed detector is generally a two part type, with a detection head composed of a sensor and a transmitter installed on the detection site. A secondary instrument composed of a circuit, power supply, and display alarm device is installed in a safe place for easy monitoring. The detection principle of the gas detector is the same as described in the previous section, but it is more suitable for the continuous, long-term stability and other characteristics required for fixed detection in terms of process and technology.
Generally speaking, each sensor corresponds to a specific detection gas, but any gas detector cannot be special. Therefore, when selecting a gas sensor, it is important to understand the detection interference of other gases on the sensor as much as possible to ensure its accurate detection of specific gases.
