System Sensor 5151 Plug-In Heat Detector

- Low standby current
- Two visible LEDs “blink” in standby and provide a 360° field viewing angle
- Wide variety of mounting bases with built-in shorting spring
- Detector head plugs easily into base
- Built-in test switch
- Field sensitivity metering of detector to meet the requirements of NFPA 72
- Built-in tamper-resistant feature
- SEMS screws for easy wiring
- Optional recessed mounting
- Removable cover for field cleaning

- Diameter: 4.1 inches (104 mm)
- Height: 2.1 inches (53 mm)
- Weight: 5 ounces (150 g)
- Installation Temperatures: 32° to 100°F (0° to 38°C)
- Operating Humidity Range: 10% to 93% Relative Humidity
- Latching Alarm: Reset by momentary power interruption
- Sensitivity 135°F (57°C) Fixed or 15°F/min rate-of-rise
- Operating Voltage: 15-35 VDC
- Standby Current: 100 μA

System Sensor 5151 Spec Sheet 

System Sensor 5151  Manual

The 5551 thermal detector meets the needs for applications where rapid response is vital and rapid temperature increases would only be caused by a fire emergency.

This detector contains a unique dual thermistor heat sensing circuit that provides maximum performance and solid-state reliability. It initiates an alarm in response to rapid rate-of-rise (increases in excess of 15°Fper minute) and fixed heat (135°F) conditions. This enables the detector to communicate an alarm to the central control panel prior to reaching its fixed set point for high rates of rise, providing a timely response to both rapid and slow temperature increases.

The detector also provides other key features, including a recessed mounting option, a variety of mounting bases, and a full line of optional accessories. S2101 OB3AO.