What are gas detection standards?
1. Inspection of appearance and other items
Checking the appearance is something we need to do after purchasing a gas detector, which is to avoid minor problems during transportation or production assembly. We need to check the appearance of the gas detector for any minor issues. If there are defects, cracks or damages, check if the entire gas detector component structure is intact.
At the same time, the machine model, label, manufacturer name, production time, and manual on the gas detector should be checked one by one to ensure accuracy. At the same time, the explosion-proof status mark, measurement permit mark, and number of the gas detector should be checked, and they must be complete and clear. Some documents may require the manufacturer to provide them.
2. Power on inspection
Generally, it is a built-in battery power supply. We need to turn on the switch to check if the gas detector is powered on properly. Some gas detectors can continue to work by replacing the battery, and some gas detectors are equipped with chargers;
For gas detectors with chargers, we need to test whether the charger is charging correctly. If the power supply is normal, we must check whether the display screen of the gas detector is displaying correctly.
3. Check if the sound and light alarm of the instrument is normal
For the sound and light alarm signal gas detector, as it is powered by batteries, when undervoltage is displayed, it should be able to emit a signal that is significantly different from the alarm signal sound or light indication signal. The gas detector we purchased is used to detect gas concentration. The gas concentration display of the gas detector cannot be very accurate, which is an error. However, this error is within a range. If it exceeds this range, it means that the gas detector does not meet the standard, and the display error specified for different gases is different.
For example, it is normal for the display error of oxygen to be within the range of ± 0.5 tol.
The alarm error mentioned above refers to the error in the display value, so there is also a certain allowable error for the alarm value of gas detectors, because the instrument is affected by various factors and cannot accurately alarm the concentration every time. This allows for errors in the alarm concentration, as long as the error is within the standard range.
The alarm error of different gases also varies, for example, the alarm error of oxygen is within the range of ± 0.1 sol.
4. Response time
Response time refers to the time required for a gas detector to display a stable value of 0 to 90% of the instrument, which is also standard. This standard is the same as the gas response time for different indication errors and alarm errors.
For example, the response time of oxygen is less than or equal to 20S.
5. Insulation and voltage resistance
Insulation and withstand voltage have certain insulation resistance standards that must be met for gas detectors. The standard requirements are: room temperature ≥ 100M Ω; After high temperature and humidity: ≥ 1M Ω.
The insulation strength should be able to withstand a 500V AC voltage for 1 minute without any discharge or malfunction, which meets the description of this gas detector and the standards.
