Issues regarding the first and second level alarm settings for carbon disulfide detectors
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For carbon disulfide, when a toxic gas alarm is installed, according to the new standards issued in 2019, the first-level alarm threshold is set at 10 mmg/m3 (again, this value is calculated on a weighted time basis). However, modern alarms are very accurate in detecting zero drift related to carbon disulfide. Our facility has installed 7 such alarms from Teian, with a measurement range of 0–100 ppm; the first-level alarm threshold set for these alarms is 5 ppm, while the second-level threshold is 10 ppm. Out of these 7 units, roughly two are relatively stable, while the others all exhibit some degree of zero drift. I originally wanted to set it at 5% for fatal hazards, but I couldn’t find any specification indicating the IDLH value for carbon disulfide. I hope experts can guide me on how to set this value, or where the standards that define carbon disulfide’s IDLH are to be found! ! ! ! Thank you, thank you, thank you
This can be found with a quick search. Referring to Appendix B of GBT 18664-2002 \"Selection, Use and Maintenance of Respiratory Protection Equipment\", the IDLH for carbon dioxide is 50,000 ppm
Thank you so much! ! ! ! ! ! :handshake