Teledyne Gas and Flame PS500

Teledyne Gas and Flame PS200 details:

Personal Safety Gas Monitors-The PS500 can be configured to detect up to five gases. It does this with its electrochemical and catalytic sensors, photo ionisation detectors (PID), and infrared capabilities.
?Plug and Play? maximizes flexibility by allowing other gases to be detected, by simply inserting a new smart sensor assembly. The PS500 is effective in noisy environments, featuring a loud (95dB) penetrating and distinctive audible alarm together with a high visibility visual alarm.