Gas detector calibration skills introduction
Like other analytical and testing instruments, the gas detector is measured by a relative comparison method: first, the instrument is calibrated with a zero gas and a gas with a standard concentration, and the standard curve is obtained and stored in the instrument. , the instrument compares the electrical signal generated by the gas concentration to be measured with the electrical signal of the standard concentration, and calculates an accurate gas concentration value. Therefore, zeroing the instrument at any time and frequently calibrating the instrument are essential tasks to ensure the accuracy of the instrument measurement. It should be noted that many gas detectors can replace the detection sensor at present, but this does not mean that a detector can be equipped with different detector probes at any time.
Whenever the gas detector is replaced, in addition to a certain sensor activation time, the instrument must be recalibrated when the probe is replaced. In addition, it is recommended to test the response of the standard gas used for the instrument before using the gas detector for various instruments to ensure that the instrument really plays a protective role. If this type of instrument is used as a safety alarm in an open place, such as an open workshop, a wearable diffusion gas detector can be used, because it can continuously, real-time, and accurately display the concentration of toxic and harmful gases on site. The fixed detector is generally a two-body type. The detection head composed of a sensor and a transmitter is installed on the detection site as a whole, and the secondary instrument composed of a circuit, power supply and display and alarm device is installed in a single place as a whole, which is convenient for monitoring. The detection principle of the gas detector is the same as that described in the previous section, but it is more suitable for the characteristics of continuous and long-term stability required by fixed detection in terms of process and technology.
Generally speaking, each sensor corresponds to a specific detection gas, but any gas detector cannot be accurate and special. Therefore, when selecting a gas sensor, it is necessary to understand the detection interference of other gases to the sensor as much as possible, so as to ensure its accurate detection of specific gases.
