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The 2351TIR multi-criteria detector is a combination heat and smoke detector, with supplementary infra-red (IR) sensor, for Pertronic intelligent addressable fire alarm systems.

This detector features a smoke sensing chamber designed to detect smoke and diminish stray internal reflections that can cause nuisance alarms. These features were developed to satisfy stringent nuisance alarm immunity tests defined in the US smoke detector standard, UL 268 edition 7.

A photoelectric sensor measures the smoke density in the sensing chamber. Temperature in the detector’s surroundings is measured by two thermal sensors, one on each side of the detector. In addition, an IR sensor measures the level of infra-red light in the IR sensor’s line of sight.

The PTIR becomes more sensitive to smoke if the infra-red sensor detects flickering, typical of flames. In addition, smoke sensitivity increases if the thermal sensors detect a temperature increase that is not enough to trigger a thermal alarm.

Capable of responding rapidly to fast-flaming fires, the PTIR is designed to reduce nuisance alarms.

A thermal alarm signal is reported to the fire panel if either thermal sensor exceeds 135 °F. This thermal alarm is independent of the photoelectric and IR sensors.

A suitably configured fire panel will display the location of any detector which has triggered an alarm, fault, or maintenance signal.

Features

• Each detector is individually identifiable on the fire panel display
• Intelligent addressable (IA) communication with fire panel
• Automatic drift compensation
• Stable communication with excellent noise immunity
• Fire panel may be configured with separate alarm, fault, and maintenance thresholds for each individual detector
• Rotary address switches for setting the address on the intelligent addressable SLC
• Fire panel identifies active detectors by lighting up two red LEDs on the detector housing
• LEDs briefly light up (“blink”) when the detector is polled
• LED blink may be disabled via the fire panel configuration
• Dual LEDs for visibility from all normal viewing angles
• Optional remote LED indicator available
• Magnet test function activates detector and bypasses inbuilt delays to facilitate testing
• Compatible with B300-6 and other System Sensor intelligent addressable bases
• Compatible bases provide an optional anti-tamper feature
• UL listed to UL 268 edition 7 and UL 521