What are the common faults and solutions of gas detector?
Fault 1. Low concentration gas cannot be detected.
Solutions:
1. Check whether the air pump of the gas detector works normally, and 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, introducing nitrogen to calibrate the zero point or calibrating the zero point in clean air, and testing after calibration;
3. If the measured gas cannot be detected after zero calibration, the factory settings of the gas detector should be restored;
4. After all the above steps, it can't be detected. It is necessary to confirm whether there is the gas to be detected at the site, or the concentration of the gas to be detected is really low. If it is lower than the small detection accuracy of the gas sensor, it can't be detected.
Fault 2. In the air, there is no gas to be measured, but the value fluctuates greatly or jumps.
Solutions:
1. The short-time zero fluctuation range is less than 1% of the large range, and the long-time drift is less than 2% of the large range without the measured gas. If it exceeds this range, it is necessary to confirm whether there is the measured gas in the field, or the temperature and humidity in the air fluctuate greatly, resulting in unstable values;
2. Confirm whether zero calibration or target point calibration operation has been carried out on the gas detector. If zero calibration operation is carried out in the presence of the gas to be measured, low-concentration gas may not be detected. If target point calibration is carried out in the presence of the gas to be measured, but the calibrated concentration value does not match the actual concentration value, which may cause the gas detector to fluctuate greatly or the detected value is too small. These two situations can be solved by resuming factory operation.
3. If the problem cannot be solved, it is necessary to confirm whether high-concentration gas is introduced into the gas detector or whether high-concentration gas has impacted the gas sensor. If it has impacted the gas sensor, after the gas detector is turned on and aged for 24 hours, the value is still unstable, so the gas sensor may be damaged by impact, and the gas sensor needs to be replaced.
Fault 3. Inaccurate detection
Solutions:
1. Confirm whether the gas concentration at the site is accurate, and the difference between the theoretical value and the actual value is very large. Calibrate the gas detector with standard gas to ensure the detection accuracy, or send it to a third-party metering institution for verification and calibration;
2. If the gas sensor is used for a long time, the measured value may have errors, so it is necessary to confirm with the manufacturer whether the gas sensor can be used again. If the sensor itself is nearing its service life, it can be used normally for a short time even after recalibration, but the measured value of the gas detector will drift and be inaccurate, so it is recommended to replace the gas sensor.
Fault 4, alarm when the value is 0 or when the alarm value is not reached in the air.
Solutions:
1. Check whether various alarm value parameters of the gas detector have been modified;
2. Check whether the alarm mode and alarm mode of the gas detector have been modified;
3. Check whether the alarm status of the gas detector is concentration alarm or other fault alarm. The words A1 or A2 will appear in the concentration alarm, and the red indicator will flash;
4. If the alarm of the gas detector is caused by manual operation modification, it can be solved by restoring the factory settings. The fault alarm needs to be further checked for short circuit, open circuit, poor contact, sensor failure, etc., or sent back to the manufacturer for inspection.
