Field Instruments

General

The Opal NFX-TFIX58 & NFX-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 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 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 Advanced 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 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.

Features:

• 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

Specifications

• Make : Notifier By Honeywell
• Model: NFX-TDIFF
• Operating Voltage Range:  15 to 32Vdc
• Remote Output Voltage: 22.5Vdc
• Remote Output Current: 10.8mA @ 24Vdc
• Additional loop resistance  using the B501AP:  typ 20 mohm (max 30 mohm)
• Height: 61mm installed in B501AP base
• Diameter:  102mm installed in B501AP base
• Weight:   88g (inc base)
• Max Wire Gauge for  Terminals:  2.5mm2
• Colour:   White  
• Material:   PC/ABS

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