The Opal NFXI-TFIX58 & NFXI-TFIX78 are fi xed temperature analogue addressable sensors employing low mass thermistors and microprocessor technology for fast response and linear temperature sensing. Their linear response allows these sensors to be used to signal temperatures over the range of 58�C (Class A1S) to 78�C (Class BS).
The Opal NFXI-TDIFF uses the same thermistor and microprocessor technology to provide an alarm when the rate of rise in temperature exceeds 10�C/minute (typical) or if the temperature exceeds a threshold of 58�C (Response Class A1R). Notifi er's Opal protocol allows it to be software confi gured to be either a fi xed 58�C, a fi xed 78�C unit or a 58�C with rate of rise device. For backwards compatibility and approval continuity, three separate versions continue to be available as separate part numbers.
The sensing elements of all three heat sensors are panel controllable through the Opal Protocol so the sensitivity thresholds of each element can be changed by the panel offering the ability to customise the device for the changing use of the area it is protecting. The detectors have built in short circuit isolation and two integral tri-colour LEDs that provide 360� local visual indication of the device status. The LEDs are programmable with static or blinking red, amber and green status indications available.
