System Sensor 2251B Photoelectric Smoke Detector

The System Sensor 2251B plug-in type smoke sensors combine a photoelectronic sensing chamber with addressable-analog communications. Also, the sensors transmit an analog representation of smoke density over a communication line to a control panel. Additionally, rotary-decade switches are provided for setting the sensor’s address.

System Sensor recommends spacing sensors in compliance with NFPA 72. In low airflow applications with smooth ceilings, space sensors 30 feet apart. When using the 2251TMB as a heat detector in FM3210 compliant applications, space sensors 20 feet apart. Furthermore, for specific information regarding sensor spacing, placement, and special applications, refer to NFPA 72 or the System Smoke Detector Application Guide, available from System Sensor.

All wiring installed in compliance with the National Electrical Code, applicable local codes, as well as any special requirements of the Authority Having Jurisdiction. Additionally, System Sensor 2251B Improper connections will prevent a system from responding properly in the event of a fire.

Features / Specifications

• Voltage Range: 15 to 32 VDC
• Standby Current: 300µA @ 24 VDC
• Humidity Range: 10% to 93%
• Temperature Range: 32°F to 120°F
• All wiring must be installed in compliance with the National Electrical Code
• UL Listed & ULC Listed