In the field of industrial production, any place where hydrogen may leak needs to use a hydrogen detector to detect changes in the concentration of hydrogen, because it is our key to prevent hydrogen leakage accidents and ensure the safety of personnel and equipment. One of the lines of defense. Therefore, when formulating the alarm threshold, we need to comprehensively consider various factors to ensure that the hydrogen detector can not only meet the safety requirements, but also avoid false positives or omissions. Do you know the alarm threshold of hydrogen detector ? The following is a brief introduction by yiyuntian electronics:

The alarm threshold of the hydrogen detector is set according to relevant safety standards and actual conditions, specific as follows:

1. alarm threshold setting criteria

The alarm threshold of the hydrogen detector mainly refers to the following national standard documents:

GBT 50058-2014 Code for Design of Electrical Devices in Explosive Hazardous Environments:

The lower explosive limit (LEL) of hydrogen is 4.00 Vol, that is, when the concentration of hydrogen in the air reaches 4.00, combustion and explosion may occur in case of open flame.

GBT 50493-2019 Petrochemical Combustible Gas and Toxic Gas Detection and Alarm Design Standard (official version):

The first level alarm setting for combustible gas shall be less than or equal to 25% LEL.

The secondary alarm setting for combustible gas shall be less than or equal to 50% LEL.

2. specific alarm thresholds