H2S alarm value setting
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I would like to ask the experts: What should be the first-level and second-level alarm settings for the H2S alarm value on the DCS? The safety supervision agency inspected us and said that our set values were incorrect – 10%, 30%?
If the safety supervision department says you’re wrong, then won’t you let them guide you in setting the correct value? ! It’s really pointless. Coming here to ask – what can you possibly find out? ...
Level 1: ≤10 mg/m3; Level 2: ≤43 mg/m3. If it is in ppm, conversion is required
Grade 1 <10mg/m3 Grade 2 <20mg/m3
The settings vary from place to place, making it hard to know what to answer
The maximum allowable concentration of hydrogen sulfide in the air according to national standards is 10 ppm. Section 4.1 on allowable concentrations of chemical substances in workplace air in the standard \"Occupational Exposure Limits for Hazardous Factors in the Workplace – Part 1: Chemical Hazardous Factors\" (GBZ 2.1-2007) specifies that the maximum allowable concentration of hydrogen sulfide is 10 mg/m3. The third-level alarm value for hydrogen sulfide gas detectors is: 2TLV=20ppm. Level 1 alarm: 1/2 TLV = 5 ppm; Level 2 alarm: 1 TLV = 10 ppm.
The unit for hydrogen sulfide is ppm, right?