Common problems encountered and how to solve these
Fault 1. Low concentration gas cannot be detected
solutions:
1. Check whether the air pump of the gas detector is working normally. Use your fingers to block the air inlet for 5 seconds. If you feel obvious suction, if there is no suction, check whether the air inlet is blocked;
2. Pour in nitrogen to calibrate the zero point or calibrate the zero point in clean air, and then perform testing after calibration;
3. If the measured gas cannot be detected after zero point calibration, the gas detector needs to be restored to factory settings;
4. If the gas cannot be detected after following the above steps, you need to confirm whether the gas to be measured exists on site, or the concentration of the gas to be measured is indeed very low. If it is lower than the small detection accuracy of the gas sensor, it cannot be detected.
Fault 2. In the air, there is no measured gas, but the value fluctuates greatly or jumps randomly.
solutions:
1. The short-term zero point fluctuation range is less than 1% of the large range, which is a normal range. When there is no measured gas, the long-term drift is less than 2% of the large range, which is a normal range. If it exceeds this range, it is necessary to confirm whether there is a measured object on site. The temperature and humidity in gas or air fluctuate greatly, causing numerical instability;
2. Confirm whether the zero point calibration or target point calibration operation has been performed on the gas detector. If the zero point calibration operation is performed where there is a gas to be measured, low concentration gas may not be detected. If the zero point calibration operation is performed where there is a gas to be measured. The target point has been calibrated, but the calibrated concentration value does not match the actual concentration value, which may cause the gas detector value to fluctuate greatly or the detected value to be too small. Both of these situations can be solved by restoring to factory settings;
3. If the problem still cannot be solved, you need to confirm whether the gas detector is supplied with high-concentration gas or the high-concentration gas impacts the gas sensor. If there is impact on the gas sensor, turn on the gas detector and run it for 24 hours. If the value is still unstable, 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 on site is accurate. The difference between the theoretical value and the actual value is very large. Calibrate the gas detector by passing in standard gas to ensure the detection accuracy, or send it to a third-party measurement agency for verification and calibration;
2. If the gas sensor is used for a long time, the measurement value may have errors. You need to confirm with the manufacturer whether the gas sensor can still be used. If the sensor itself is approaching the end of its service life, it may still be normal even after recalibration for a short period of time. However, the measured value of the gas detector will drift and the detection is inaccurate. It is recommended to replace the gas sensor.
Fault 4. When the value is 0 or the alarm value is not reached in the air, the alarm will also occur.
solutions:
1. Check whether the 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 a concentration alarm or other fault alarm. In the concentration alarm, the words A1 or A2 will appear, and the red indicator light will flash;
4. If the gas detector alarm is caused by human modification, it can be solved by restoring the factory settings. If the fault alarm occurs, you need to further check whether there is short circuit, open circuit, poor contact, sensor failure, etc., or send it back to the manufacturer for inspection.
