1 About the over-range operation of the Detector
The user should avoid impacting the sensor with a gas that exceeds the range of the instrument. This operation will affect the service life and detection accuracy of the Detector if it is light, and will directly damage the sensor of the Detector if it is serious . When the user accidentally performs an over-range operation, the instrument should be quickly withdrawn from the testing site, placed in clean air for more than half an hour, and observe whether the concentration value of the instrument drops. If the concentration value can drop to the normal value, at this time The instrument can continue to be used after zero point calibration; if the concentration value of the instrument is still high after being placed in clean air for a long time after the instrument is used in over-range operation, it should be sent back to the manufacturer or agent for maintenance and ready to replace the sensor. (Special attention: damage to the instrument caused by operation beyond the measuring range of the Detector is not covered by the warranty).
2. The concentration value of the instrument in clean air is unstable, fluctuating high-low, with a small amount of numerical display
Cause of failure: Some electrochemical gas sensors are easily interfered by other gases, and the interfering gas may be colorless and odorless
Solution: Put the instrument in a clean place without interfering gases, and the instrument value will drop to the normal value; if it is determined to be a clean place, but the value still cannot drop, you can perform a zero point calibration once.
3. When the instrument is connected to the gas test, there is no response to the value, or the response is very weak
Cause of failure: It may be that the oxygen content of the gas introduced is too low: <5%; it may be that the pressure of the gas is too negative, and the air pump cannot pump it; it may be that the service life of the sensor has expired, or the sensor has failed; it may be It is not calibrated well, resulting in abnormal values;
Solution: If it is an electrochemical, catalytic combustion, or semiconductor gas sensor, it needs oxygen to work normally. Ensure that the oxygen content of the incoming gas is > %VOL, and the gas pressure is -30Kpa ~ 100Kpa. If the user has a standard gas, you can Pass gas test and perform target point calibration. If the oxygen and pressure meet the normal conditions, it may be that the sensor is faulty and needs to be returned to the factory for repair.
4. After the gas is introduced, the value of the instrument will not be stable for a long time, or it may be high or low
Cause of failure: Generally, it is caused by the low oxygen content of the incoming gas; it may also be that the gas concentration itself changes.
Solution: increase the oxygen content of the gas and stabilize the flow rate; or replace the standard gas test with high oxygen content.
5. The air pump of the instrument is unable to pump air, or the sound is hoarse
Cause of failure: The air pump of the instrument sucks in too much dust particles, oil and gas, etc., causing blockage.
Solution: Return to the factory to replace and clean the air pump, and add an external dust and water vapor filter at the air inlet when it is used next time.
6. The instrument cannot be turned on
Cause of failure: Generally, the battery is out of power.
Solution: start the test after charging, if it still can’t start, you need to return to the factory for testing.
7. The instrument cannot be charged
Cause of failure: Generally, there is a problem with the battery charger, or the specification of the charger is wrong (5-5.5 VDC, above 1A)
Solution: Measure whether the output voltage of the charger is 4.75-5.5V. If the output voltage is abnormal, replace the charger. If the output voltage of the charger is normal, return to the factory for testing.
