What to Do If a Portable Gas Detector Provides Inaccurate Readings
Solutions:
① Verify whether the actual on‑site gas concentration is correct. Large deviations may exist between theoretical values and real‑world values. The accuracy of the instrument can be verified by applying standard calibration gas, or the unit may be sent to a third‑party metrology institute for testing.
② If the sensor has been in service for a long time, measurement errors may occur. Confirm with the manufacturer whether the sensor can still operate properly. When a sensor is nearing the end of its service life, it may work normally right after calibration yet fail shortly afterwards. Sensor replacement is recommended in such cases.
Zero Reading or Alarm Triggered in Fresh Air without Reaching Alarm Threshold
Solutions:
① Check whether the alarm threshold has been modified.
② Check whether the alarm method and alarm mode have been changed.
③ Distinguish between concentration alarm and fault alarm. Concentration alarms show AL or AH indicators with flashing red LED. Fault alarms activate the yellow LED.
④ If alarms are caused by manual parameter modification, restore factory settings to resolve the issue. For fault alarms, further inspect for short‑circuit, open‑circuit, poor contact or sensor failure, or send the instrument back to the manufacturer for inspection.
