What are the requirements for using portable combustible gas detectors?
In order to locate gas production and usage sites, portable flammable gas detectors are extensively utilized in the coking, chemical, petroleum, natural gas, and metallurgical industries. They can also be used to detect the storage, distribution, and transmission of gas. Managers of occupational safety as well as maintenance and inspection staff can use them. necessary protective gear. What conditions must be met in order to use a portable flammable gas detector?
1. The value of the alarm setting
There is a detector that detects the set value, and its detection set value should be in the range of 1% LEL ~ 25% LEL; the portable combustible gas detector has two detection settings: low limit and high limit; the low limit detection setting value should be in the range of 1% LEL ~ 25% LEL, and the high limit detection setting value should be 50% LEL;
2. Value of alarm action
The portable combustible gas detector's detection action value must not be less than 1% LEL, and the discrepancy between the detector's detection action value and the detection setting value must not be greater than ±3% LEL;
3. Deviation of the whole range indicator
In the case of detectors equipped with flammable gas concentration display functionalities, the discrepancy between the indicated and real values must not surpass ±5% LEL.
4. Reaction time
When the displayed value approaches 90% of the actual value, the response time (t90) for detectors with a flammable gas concentration display function shouldn't be more than 30 seconds. The detection reaction time for detectors without functions for displaying the concentration of flammable gas shall not be longer than 30 seconds;
5. The portable combustible gas detector's battery level needs to be adjusted.
It should be able to produce distinct sound and light signals from the alarm signal when the battery is low, in addition to its usual battery function;
7. Store the detector without electricity for 24 hours at -25°C±2°F, then put it back in a normal environment for at least 24 hours, followed by a 24-hour period at 55°C±2°F, and then put it back in a normal environment. recuperate under the circumstances for a minimum of 24 hours;
8. Orientation (the outside inhalation detector)
Every 45°, the detector's detecting action value is measured along the three mutually orthogonal axes of X, Y, and Z. The deviation between the value of the detection action and the value of the detection setting shouldn't be more than ±5% LEL.
9. High concentration engulfment function (fits only with detectors that are explosion-proof)
When the gas concentration above the measurement range, the detector need to emit an alert, fault signal, or clear indication signal during the submersion period;
10. Repeatability of tests
Six measurements of the detecting action value are made with the same detector in typical environmental conditions. The deviation between the detector's detection action value and the detection setting value shouldn't be greater than ±3% LEL.
