Description

System Sensor 2251BR is a plug-in type smoke sensor that combines a photoelectronic sensing chamber with addressable-analog communications. Also, the sensor transmits an analog representation of smoke density over a communication line to a control panel. Rotary-decade switches are provided for setting the sensor’s address.

Two LEDs on the sensor are controlled by the panel to indicate sensor status. An output is provided for connection to an optional remote LED annunciator. When 2251BR is used in duct applications with a DNR/DNRW, testing can be done remotely using approved System Sensor test accessories, eliminating the need for a test coil. Besides, the 2251BR requires compatible addressable communications to function properly. Connect the 2251BR sensor to listed compatible control panels only.

All wiring must be install in compliance with the National Electrical Code, applicable local codes, as well as any special requirements of the Authority Having Jurisdiction. Proper wire gauges should be use. Furthermore, the installation wires should be color-code to limit wiring mistakes and ease system troubleshooting. In addition, improper connections will prevent a system from responding properly in the event of a fire.

In general, the System Sensor 2251BR includes a tamper-resistant capability that prevents its removal from the bracket without the use of a tool. Refer to the base manual for details on making use of this capability.

Features / Specifications

• Operating Voltage Range: 15 to 32 VDC
• Standby Current: 300µA @ 24 VDC
• Maximum Alarm Current (LED on:) 6.5 mA @ 24 VDC
• Operating Humidity Range: 10% to 93% Relative Humidity, Non-condensing
• Operating Temperature Range: 32°F to 120°F (0°C to 49°C)