1. The gas detector confirms whether the actual concentration of the gas in the detection environment is accurate. The difference between the theoretical value and the actual value is very large. It is recommended to calibrate the instrument with standard gas to ensure the detection accuracy, or send it to a relevant third party above the provincial level. Calibration of metrological verification institutions; it is difficult for non-professional institutions to deal with the accuracy of such products.
2. If the detection is still inaccurate after calibration, it is necessary to confirm with the manufacturer whether the gas sensor can continue to be used. If the sensor itself is approaching its service life, even if it can be used normally for a short time after re-calibration, measurement will still occur after a period of time. If the value is inaccurate and the drift value is too large, it is recommended to contact the manufacturer to replace the gas sensor.
3. If the gas sensor is used for a long time, the measured value may have errors, and the detector needs to be re-calibrated.
About the solution to the low concentration gas detection of the gas detector:
1. First of all, if it is a pump suction gas detector, first check whether the air pump is working normally, block the air inlet with your fingers for 5 seconds, if you feel obvious suction normally, if there is no suction, check whether the air inlet is blocked;
2. Next, pass nitrogen to calibrate the zero point or calibrate the zero point in clean air, and then test after calibration;
3. If there is no gas detected after the zero point calibration, it is necessary to restore the factory settings;
4. In the end, the above steps can not be detected. It is necessary to confirm whether there is the gas to be tested on the site, or the concentration of the gas to be tested is really low. If it is lower than the minimum detection accuracy of the gas sensor, it cannot be detected.
