Fault 1: Low concentration gas cannot be detected

1. Check if the gas detector air pump is working properly. Block the air inlet with your fingers for 5 seconds. If you feel a significant suction force, if there is no suction force, check if the air inlet is blocked;

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 calibrating the zero point, the gas detector needs to be reset to its factory settings;

4. The above steps have been followed but still cannot be detected. It is necessary to confirm whether there is a 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: There is no measured gas in the air, but the value fluctuates greatly or jumps around

1. A short-term zero point fluctuation range of less than 1% of the large range is within the normal range, and a long-term drift of less than 2% of the large range without the measured gas is within the normal range. If it exceeds this range, it is necessary to confirm whether there is the measured gas on site, or whether the temperature and humidity fluctuations in the air are large, 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 has been performed in the presence of the measured gas, low concentration gases may not be detected. If target point calibration has been 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's values or detect values that are too small. These two situations can be resolved by restoring the product to the factory;

4. If the problem still cannot be solved, it is necessary to confirm whether the gas detector has been filled with high concentration gas or if high concentration gas has impacted the gas sensor. If the gas sensor has been impacted, turn on the gas detector and run it for 24 hours. If the value is still unstable, it may be that the gas sensor has been damaged by the impact and needs to be replaced.

Fault 3: Inaccurate detection
1. Confirm whether the gas concentration on site is accurate, as there is a significant difference between the theoretical and actual values. Use standard gas to calibrate the gas detector to ensure detection accuracy, or send it to a third-party measuring institution for calibration;

2. If the gas sensor is used for a long time, there may be measurement errors. It is necessary to confirm with the manufacturer whether the gas sensor can still be used. If the sensor is approaching its service life, even if it can be used normally in a short period of time after recalibration, the gas detector's measurement values may drift and the detection may be inaccurate. It is recommended to replace the gas sensor.