How to determine whether a toxic gas detector is in a normal operating condition?
1, Basic status check
Appearance and Connection
Observe whether the shell of the toxic gas detector is damaged or cracked, whether the sensor interface is loose or corroded, and whether the cable is aged or broken. For portable devices, check if the battery compartment is in good contact and if the battery level display is sufficient. Usually, there will be a battery level prompt after turning on, and low battery may cause abnormal detection.
Power-On Self-Test
After the normal device is turned on, it will enter the self-test program, and the screen will display prompts such as "preheating" and "system self-test". The indicator light will flash regularly, and the green light will remain on or flash to indicate normal standby. If there is no response, the screen goes black, error codes (such as "ERR" or "SENSOR FAIL"), or the self-test time is too long after booting up, there may be a fault.
2, Functional response testing
Zero point calibration verification
In a clean air environment such as fresh outdoor air, ensure that there is no target gas interference. After the toxic gas detector stabilizes, the displayed value should be close to "0" or within the zero error range specified in the manual. If the zero drift is too large, it may be due to sensor aging or equipment failure.
Standard gas testing
This is the most direct verification method: using a standard gas of known concentration, such as the corresponding standard gas when detecting carbon monoxide, and passing it through a gas bag or flow meter to the toxic gas detector sensor. Under normal circumstances, the toxic gas detector should display a value close to the standard gas concentration within the specified time and trigger an alarm. If the numerical deviation is too large or there is no response, it indicates that the detection function is abnormal.
Alarm function test
In addition to triggering alarms with standard gases, some toxic gas detectors support manual triggering of alarms by long pressing the "Alarm Test" button. It is necessary to check whether the sound, light, and vibration of the portable device are normal: the sound should be clear and bright, the light should flash noticeably, and the vibration mode should be strong and perceptible.
3, Status indication and data recording
Indicator lights and screen information
When working normally, the device indicator light should display the corresponding status: green indicates normal operation, yellow may prompt warnings such as "calibration required" and "insufficient sensor life", and red indicates an alarm state. The screen should display real-time concentration, unit, time and other information clearly, without garbled or stuttering.
Historical data and fault records
Viewing the historical data stored on the device, if there are frequent records of "zero point anomalies", "sensor failures", or irregular jumps in the data curve, it may indicate a decrease in device stability. Some industrial grade equipment supports connecting to a computer to export logs, which can further analyze the cause of the malfunction.
