Standard for hydrogen sulfide alarm value of four in one gas detector
The setting of the hydrogen sulfide alarm value for the four in one gas detector is very important, as it needs to determine the appropriate value according to relevant standards and requirements. Hydrogen sulfide is a highly toxic gas that poses great harm to both the human body and the environment. Therefore, early detection and alarm are 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 maximum allowable MAC concentration for occupational exposure limits of hydrogen sulfide is 10mg/m3. This standard provides an acceptable concentration range for hydrogen sulfide in the workplace.
According to the national standard "GB/T 50493-2019 Design Standard for Combustible and Toxic Gas Detection and Alarm in Petrochemical Industry", the measurement range of toxic gases should be 0-300% OEL, with an OEL of 10mg/m3. The first level alarm value should be less than or equal to 100% OEL, i.e. 10mg/m3, and the second level alarm value should be less than or equal to 200% OEL, i.e. 20mg/m3. When the measurement range of the existing detector cannot meet the requirements, the first level alarm value shall not exceed 5% IDLH, and the second level alarm value shall not exceed 10% IDLH.
Based on the requirements of the above standards, we can come up with the following guidelines for setting the hydrogen sulfide alarm value of the four in one gas detector:
1. Measurement range: 0-30mg/m3, equivalent to a volume concentration of 0-20ppm.
2. First level low alarm set point (AL): not exceeding 10mg/m3, i.e. not exceeding a volume concentration of 6.5ppm.
3. Secondary high alarm set point (AH): not exceeding 20mg/m3, i.e. not exceeding 12ppm volume concentration.
The alarm value range set in this way can ensure timely alarm when the safe concentration is exceeded, protecting the health and life safety of personnel.
When selecting a specific four in one gas detector, attention should be paid to its quality and performance. A good gas detector should have the characteristics of high accuracy, high sensitivity, fast response, and stability and reliability. At the same time, the instrument is easy to operate and portable, which can meet the requirements of different working environments and needs.
In short, setting the hydrogen sulfide alarm value of the four in one gas detector reasonably is crucial for protecting the health and safety of personnel in the workplace. When setting alarm values, reference should be made to relevant national standards to ensure that the set values can timely and effectively issue alarms, reducing potential risks and hazards. At the same time, when selecting and using gas detectors, attention should be paid to their quality and performance to ensure the accuracy and reliability of the instrument.
