Suitable for Notifier fire detection and alarm systems.

The Opal NFX-TFIX58 and NFX-TFIX78 are fixed 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 NFX-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). With the implementation of the advanced protocol, any model can be software configured to be either a fixed 58°C, a fixed 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.

Features and benefits:

• 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.
• 100% mechanical and electrical backwards compatibility.
• Base designed to ease installation and wiring.
• EN54 Certified.