Open-path (line-of-sight) gas detector
Offshore F&G layout practice (ISA 5.1-style letter codes) / ISO 7240 / NFPA 72
Drawn as
A transmitter box and a receiver box joined by a dashed beam line, marked OGD or Tx/Rx.
Meaning
Infrared beam detector covering a path (LEL·m), for perimeters and modules. Becomes open-path-gas-detector.
Variants
- Some legends draw a single box with a long dashed arrow
Tags
OGD · OPGD · LOS