At present, according to the relevant regulations issued by the state, for some production enterprises with potential safety hazards and units that respond to the requirements of the relevant inspection departments of the state, combustible gas alarms must be installed. When the combustible gas in the air reaches or exceeds the preset value of the equipment, the combustible gas alarm will issue an alarm to remind the operator to take safety protection measures. So do you know how to adjust the detection range of combustible gas alarm ? The following is a brief introduction by yi yun Tian:

combustible gas alarm detection range adjustment method:

is specified in the" code for design of combustible and toxic gas detection and alarm in petrochemical industry "(GB50493-2009)

1, combustible gas level 1 alarm setting value is less than or equal to 25% lower explosive limit.

2. The secondary alarm setting value for combustible gas is less than or equal to 50% of the lower explosive limit.

combustible gas alarm has a measuring range of 0-100% LEL. according to national regulations, low alarm is generally set between 15% and LEL-25 LEL, high alarm is generally set to 50% LEL, and most low alarm points of current combustible gas alarms are set to 25% LEL.

Therefore, when performing explosion measurement, the alarm concentration is generally set below 25% LEL of the lower explosion limit. The measuring range of the combustible gas alarm is 0-100% LEL. Therefore, when the combustible gas alarm adjusts the detection range, the lower limit value of a certain gas explosion is generally divided into 100 and two high and low alarm values are set, The two values of 25% LEL and 50% LEL are very safe even if the instrument reaches the high 50% LEL, because the 50% is divided equally 100 the lower explosion limit, so it is still very safe.

In summary, it is the adjustment method of the detection range of the combustible gas alarm. In general, before the combustible gas alarm leaves the factory, the manufacturer has adjusted the value according to the gas concentration of each 1 gas, so the customer can use it immediately without debugging. If you need to adjust, only according to the actual situation, to the appropriate measurement range can be.