These flame detectors give excellent immunity to false flame sources both indoors or out. They have internal self-test sources that check the detector’s operation when remotely instructed. They can operate on a conventional 2-wire (14-28 Vdc) fire systems or 4-20mA process control systems. Relay contacts are also available for Fire and Fault signals. The detectors’ operating modes can be user selected giving a choice of alarm currents, response times, latching or non-latching outputs and sensitivity. The detectors have a maximum ambient operating temperature of 55°C.