Common gas detector faults and their remedies
Fault 1: Low concentration gas cannot be detected
Solution:
1. Check if the gas detector air pump is working properly, block the air inlet with your fingers for 5 seconds. If there is a noticeable suction force, check if the air inlet is blocked if there is no suction force;
2. Inject nitrogen to calibrate the zero point or calibrate the zero point in clean air, and perform testing after calibration;
3. If the measured gas cannot be detected after zero calibration, the gas detector needs to be restored to its factory settings;
4. The above steps have all been operated but cannot be detected. It is necessary to confirm whether there is the measured gas on site, or if the concentration of the measured gas 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
Solution:
1. A short-term zero point fluctuation range of less than 1% of the large range is considered normal, and a long-term drift of less than 2% of the large range without the measured gas is considered normal. If it exceeds this range, it is necessary to confirm whether there is the measured gas on site, or if there is significant temperature and humidity fluctuations in the air, resulting in unstable values;
2. Confirm whether zero point calibration or target point calibration has been performed on the gas detector. If zero point calibration is performed in the presence of the measured gas, low concentration gas may not be detected. If target point calibration is performed in the presence of the measured gas, but the calibrated concentration value does not match the actual concentration value, it may cause significant fluctuations in the gas detector value or a small detected value. In both cases, recovery can be carried out
3. If the problem cannot be solved, it is necessary to confirm whether the gas detector has been exposed to high concentration gas or if high concentration gas has impacted the gas sensor. If there has been an impact on the gas sensor, turn on the gas detector and run it for 24 hours. If the value is still unstable, it may be that the gas sensor is damaged by the impact and needs to be replaced.
Fault 3: Inaccurate detection
Solution:
1. Confirm whether the gas concentration on site is accurate, and if there is a significant difference between the theoretical and actual values, calibrate the gas detector by introducing standard gas to ensure detection accuracy, or send it to a third-party metrology institution for calibration;
2. If the gas sensor is used for a long time, there may be errors in the measurement values. It is necessary to confirm with the manufacturer whether the gas sensor can still be used. If the sensor itself is approaching its service life, even if it can be used normally for a short period of time after recalibration, the measurement values of the gas detector may drift and cannot be detected accurately. It is recommended to replace the gas sensor.
Fault 4: Alarm occurs when the value is 0 or when the alarm value is not reached in the air
Solution:
1. Check whether various alarm value parameters of the gas detector have been modified;
2. Check if the alarm mode and alarm mode of the gas detector have been modified;
3. Check if the alarm status of the gas detector is concentration alarm or other fault alarm. The concentration alarm will display the words A1 or A2, and the red indicator light will flash;
4. If the gas detector alarm is caused by manual modification, it can be resolved by restoring the factory settings. The fault alarm needs to be further checked for short circuits, open circuits, poor contact, sensor faults, etc., or sent back to the manufacturer for inspection.
