Notifier NFXI-TDIFF A1R 58°C Addressable Heat Detector

The Notifier NFXI-TDIFF A1R 58°C Heat Detector is an analogue addressable unit that uses low-mass thermistors and microprocessor technology to deliver rapid response and accurate, linear temperature sensing. Thanks to this linear behaviour, the detector can signal temperatures ranging from 58°C (Class A1S) to 78°C (Class BS).

The Opal NFXI-TDIFF also employs thermistor and microprocessor technology to trigger an alarm when the temperature rises at more than approximately 10°C per minute, or when it exceeds the 58°C threshold (Response Class A1R). Through Notifier’s Opal protocol, the device can be software-configured as a fixed 58°C unit, a fixed 78°C model, or a 58°C detector with rate-of-rise functionality. For compatibility with legacy systems and existing approvals, three dedicated versions are still offered as separate part numbers.

All three sensor types feature panel-controlled sensing elements via the Opal Protocol, enabling sensitivity settings to be adjusted to suit changes in the protected area’s use. Each detector includes built-in short-circuit isolation and two tri-colour LEDs that provide 360° visual status indication, programmable for static or flashing red, amber, or green signals.

• Built in short circuit isolation

• New advanced Opal protocol allows mapping of the loop for precise fault location using isolators

• Tri colour LED offering red, green and amber colours

• Rotary decade address switches

• Pure white colour to complement modern buildings

• 100% mechanical and electrical backwards compatibility

• Base designed to ease installation and wiring