The gas detector is a kind of instrument for gas leakage concentration detection includes a portable gas detector, fixed gas detector, online gas detector and so on. Gas sensors are used to detect the kinds of gases in the environment and the composition and content of gases. When the gas detector leaves the factory, the manufacturer will adjust and calibrate the detector. But why it needs to calibrate regularly? It is mainly to ensure the accuracy of a gas detector.
The accuracy of the instrument is an important prerequisite for issuing an alarm when the concentration of toxic and harmful gases or combustible gases in the detection environment reaches the preset alarm limit. If the accuracy of the instrument decreases, the timeliness of the alarm will be affected, which will cause serious consequences and even endanger the lives of staff.
The accuracy of the instrument is an important prerequisite for issuing an alarm when the concentration of toxic and harmful gases or combustible gases in the detection environment reaches the preset alarm limit. If the accuracy of the instrument decreases, the timeliness of the alarm will be affected, which will cause serious consequences and even endanger the lives of the staff.
The accuracy of gas detector mainly depends on the sensors, electrochemical sensors and catalytic combustion sensors will be affected by some substances in the environment during the use of toxic failure. For example, the HCN sensor, if injected with H2S and PH3, the sensor catalyst will be toxic and ineffective.LEL sensors can be seriously affected by exposure to silicon-based products. It is emphasized in the factory manual of our gas detector that calibration should be done at least once every 12 months;In case of exposure to a high concentration of gas, a calibration operation should be performed immediately to ensure the accuracy of the instrument measurement.
Another important reason is that the detector may drift over time and exposure to gas.The detector should display as 000 in the normal environment, but if drift occurs, the concentration will be shown as greater than 0, which will affect the detection results. Therefore, the gas detector should be calibrated regularly to ensure the accuracy of the measurement. It is difficult to suppress the zero point drift by other means.
There are some calibrating methods as below for your reference:
1) Zero calibration
Long press the zero button for about 2 seconds, the 3 LED lights flash at the same time, after 3 seconds, the LED lights return to normal, the zero mark is successful。
2) Sensitivity calibration
If the key calibration is performed without the standard gas, the standard gas will fail. Enter the standard gas, press and hold the standard gas + or the standard gas -, the running light (Run) will turn on and enter the standard gas state. Press the standard gas + once, the concentration value increases by 3, and the Err light flashes once；If you do not press the standard gas + or the standard gas-for 60 seconds, the standard gas state will be exited, and the running light (Run) will return to normal flashing.
Noted: Only when there is no display board, can the mainboard buttons be used for operation. When there is a display board, please use the display board menu for calibration.