Toxic gas detector (H2S, CO)
Offshore F&G layout practice (ISA 5.1-style letter codes) / ISO 7240 / NFPA 72
Drawn as
A detector bubble marked with the toxic gas, usually "H2S" (or "CO").
Meaning
Electrochemical toxic gas detector, usually H2S with alarms at about 5 and 10 ppm. Becomes toxic-gas-detector. Hydrogen detectors (battery rooms) are marked "H2" and become hydrogen-detector.
Variants
- Some legends use a triangle with T or TOX
Tags
GD · TD · AT · AT