Notifier NFXI-TDIFF-BK Opal Rate-of-Rise Heat Detector (Black, Isolated)

The Notifier NFXI-TDIFF-BK is the black version of the Opal NFXI-TDIFF analogue addressable rate-of-rise heat detector with built-in short-circuit isolator. It uses thermistor and microprocessor technology to give an alarm when the temperature rises faster than about 10°C per minute, or when it goes above 58°C (response class A1R). It works on the Notifier Opal advanced digital protocol and fits the B501AP analogue sensor base.

Key features

• Rate-of-rise plus 58°C fixed-temperature detection (class A1R)
• Sensitivity thresholds can be changed from the panel through the Opal protocol
• Built-in short-circuit isolator
• Two tri-colour LEDs (red, green, amber) for 360° status indication, static or blinking
• Rotary decade address switches
• 100% mechanically and electrically backwards compatible

Technical specifications

• Response: rate of rise above 10°C/min (typical) or 58°C fixed threshold, class A1R
• Height: 61 mm; diameter: 102 mm (installed in B501AP base)
• Weight: 88 g excluding base
• Operating voltage: 15 to 28.5 V DC
• Maximum standby current: 200 µA at 24 V DC (no communications); 300 µA at 24 V DC (LED blink enabled)
• Maximum continuous current: 1 A (switch closed)
• Isolation current: 15 mA at 24 V DC
• Remote output: 22.5 V DC, 10.8 mA at 24 V DC
• Maximum terminal wire size: 2.5 mm²
• Material: PC/ABS
• Operating temperature: -30°C to +70°C (do not install where the normal ambient temperature exceeds 50°C)
• Humidity: 10 to 93% RH, non-condensing
• IP rating: IP20 in B501AP base; IP23 in WB-1AP wet base
• Approval: 0786-CPR-20643, EN 54-5 and EN 54-17