Four-in-one gas detector hydrogen sulfide alarm value standards
The setting of the hydrogen sulfide alarm value of the 4-in-1 gas detector is very important, and it needs to be based on the relevant standards and requirements to determine the appropriate value. Hydrogen sulfide is a highly toxic gas that is very harmful to the human body and the environment, so early detection and alarm is crucial.
According to the national standard GBZ 2.1-2019 Occupational Exposure Limits for Hazardous Factors in the Workplace Part 1: Chemical Hazardous Factors, the occupational exposure limit MAC for hydrogen sulfide is a maximum allowable concentration of 10mg/m3. This standard gives a range of acceptable concentrations of hydrogen sulfide in the workplace.
According to the national standard GB/T 50493-2019 Petrochemical Combustible and Toxic Gas Detection and Alarm Design Standards, the measurement range of toxic gases should be 0~300% OEL, and the OEL is 10mg/m3. The primary alarm value should be less than or equal to 100% OEL, i.e. 10mg/m3, and the secondary alarm value should be less than or equal to 200% OEL, i.e. 20mg/ m3. When the measuring range of the existing detector cannot meet the requirements, the primary alarm value shall not exceed 5% IDLH and the secondary alarm value shall not exceed 10% IDLH.
Comprehensive requirements of the above standards, we can derive the following four-in-one gas detector hydrogen sulfide alarm value setting guidelines:
1. Measuring range: 0~30mg/m3, which is equivalent to 0~20ppm volume concentration.
2. the first level of low alarm setting value (AL): not more than 10mg/m3, that is, not more than 6.5ppm volume concentration.
3. secondary high alarm setting value (AH): not exceeding 20mg/m3, i.e. not exceeding 12ppm volume concentration.
The range of alarm values set in this way ensures a timely alarm when the safe concentration is exceeded, protecting the health and lives of personnel.
In choosing a specific 4-in-1 gas detector, you should pay attention to its quality and performance. A good gas detector should be characterized by high accuracy, high sensitivity, fast response, stability and reliability. At the same time, the instrument is easy to operate, portable and convenient, and can meet the requirements of different working environments and needs.
