Carbon monoxide detectors must be used in areas with blast furnaces. The employer is required to provide them for employees Blast furnaces must be equipped with a hydrogen detector to continuously monitor the hydrogen content in crude gas; portable detectors are required for spot checks of leaks or to enter blast furnace shafts In hardening shops, processing, or degreasing systems both portable detectors (for leak detection) and fixed monitors (for EX and TOX hazards) are required
Micro IV	Carbon monoxide, oxygen
G750, G333	Natural gas, flammable vapors, hydrogen, carbon monoxide, oxygen