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Home » Gas Detector » How to Check After Buying Gas Detector?
How to Check After Buying Gas Detector?
Appearance inspection and other items
Appearance inspection should be carried out right after purchase of the gas detector. This can avoid small problems arising from the transportation, production or assembly process of the gas detector. It is necessary to check whether the appearance of the gas detector has defects, cracks or damage; whether the whole gas detector is equipped with all necessary components; whether the machine type, number, manufacturer's name, ex-factory time, manual or other manufacturer's information are complete. Meanwhile, we need to check the anti-explosion logo of the gas detector, measurement permission number and serial number. All the above information should be complete, and the client can ask for some certificates from the manufacturer.
Power-on inspection
The gas detector cannot work without power supply, which is usually from the inbuilt batteries. We should turn on the switch, and check whether the gas detector is normally powered on. Some gas detectors change batteries to ensure their continuous operation; some are equipped with chargers. In terms of detectors with chargers, we should check whether the chargers can get normally charged. Under the normal power-on status, we need to detect whether the display screen is normal.
Check whether the sound-light alarm of the instrument is normal
The gas detector with the sound-light alarm signals is battery-powered. When it displays under-voltage, it can emit sound or light index signals which are significantly different from alarm signals.
Indication error
We buy the gas detector to test the gas concentration, the gas concentration displayed by the gas detector might not be very accurate, and might be found with all kinds of errors. However, there is a general scope for the error. If exceeding this scope, the gas detector is not in line with the standards. There are different indication errors for different gases. For example, the indication error for the oxygen is normal within ±0.5% VOL.
Alarm error
The indication error mentioned above is found with the permissible error as to the alarm level of the gas detector. Since the instrument might be influenced by different factors, it is impossible to raise the alarm at a correct concentration. Therefore, the concentration level for alarm is allowed to have error, as long as the error is within the standard scope. The error for alarm of different gases is different. For example, the oxygen error which will raise alarm is within ±0.1% VOL.
Response time
Response time refers to the time required by the value of the gas detector which rises from zero to 90% of the steady indication value required. Meanwhile, there is a standard for the response time, and the standard, similar to indication error and alarm error, differs in response time to different gases. For example, the response time of the oxygen is smaller than or equal to 20S.
Insulation and voltage resistance
There are some standards for insulation and voltage resistance of the gas detector. Under the room temperature, the insulation and voltage resistance should be ≥100MΩ; under the hot and humid condition, the insulation and voltage resistance should be ≥1MΩ. The insulation strength should be able to tolerate 500V AC voltage for 1min. Nor should discharge or breakdown happen. When the gas detector meets all the above requirements, it means the gas detector is a qualified one. According to the above introduction, we have been generally clear about the verification technical standards of the gas detector. Of course, there are many details requiring our inspection. Only in this way can we be clear whether the gas detector we have purchased conforms to the requirements.
Appearance inspection should be carried out right after purchase of the gas detector. This can avoid small problems arising from the transportation, production or assembly process of the gas detector. It is necessary to check whether the appearance of the gas detector has defects, cracks or damage; whether the whole gas detector is equipped with all necessary components; whether the machine type, number, manufacturer's name, ex-factory time, manual or other manufacturer's information are complete. Meanwhile, we need to check the anti-explosion logo of the gas detector, measurement permission number and serial number. All the above information should be complete, and the client can ask for some certificates from the manufacturer.
Power-on inspection
The gas detector cannot work without power supply, which is usually from the inbuilt batteries. We should turn on the switch, and check whether the gas detector is normally powered on. Some gas detectors change batteries to ensure their continuous operation; some are equipped with chargers. In terms of detectors with chargers, we should check whether the chargers can get normally charged. Under the normal power-on status, we need to detect whether the display screen is normal.
Check whether the sound-light alarm of the instrument is normal
The gas detector with the sound-light alarm signals is battery-powered. When it displays under-voltage, it can emit sound or light index signals which are significantly different from alarm signals.
Indication error
We buy the gas detector to test the gas concentration, the gas concentration displayed by the gas detector might not be very accurate, and might be found with all kinds of errors. However, there is a general scope for the error. If exceeding this scope, the gas detector is not in line with the standards. There are different indication errors for different gases. For example, the indication error for the oxygen is normal within ±0.5% VOL.
Alarm error
The indication error mentioned above is found with the permissible error as to the alarm level of the gas detector. Since the instrument might be influenced by different factors, it is impossible to raise the alarm at a correct concentration. Therefore, the concentration level for alarm is allowed to have error, as long as the error is within the standard scope. The error for alarm of different gases is different. For example, the oxygen error which will raise alarm is within ±0.1% VOL.
Response time
Response time refers to the time required by the value of the gas detector which rises from zero to 90% of the steady indication value required. Meanwhile, there is a standard for the response time, and the standard, similar to indication error and alarm error, differs in response time to different gases. For example, the response time of the oxygen is smaller than or equal to 20S.
Insulation and voltage resistance
There are some standards for insulation and voltage resistance of the gas detector. Under the room temperature, the insulation and voltage resistance should be ≥100MΩ; under the hot and humid condition, the insulation and voltage resistance should be ≥1MΩ. The insulation strength should be able to tolerate 500V AC voltage for 1min. Nor should discharge or breakdown happen. When the gas detector meets all the above requirements, it means the gas detector is a qualified one. According to the above introduction, we have been generally clear about the verification technical standards of the gas detector. Of course, there are many details requiring our inspection. Only in this way can we be clear whether the gas detector we have purchased conforms to the requirements.
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