System Sensor 1251B

Ionization smoke detector

  • Material Obsolete
Brand: System Sensor Part #: 039407 Category: Manufacturer Part #: 1251B


200 Series smoke detectors are intelligent (addressable) detectors with point ID capability that enable each detector address to be set with decade address switches to provide exact detector locations. The sensitivity of 200 Series detectors can be programmed using the control panel software to suit the environment. In addition, detector sensitivity is continually monitored and reported to the panel.

The 1251B ionization detector incorporates a unique single-source, dual-chamber design to respond quickly and dependably to a broad range of fires.


Weight 1.00 lbs
Dimensions 5 × 5 × 5 in

Rotary Dials

Detection Method



Production Status

Material Obsolete


  • Sleek, low-profile design
  • Analog communications
  • Low standby current
  • Rotary address switches
  • Superior EMI protection
  • Dual LEDs for 360° visibility


200 Series: Intelligent Low-Profile Plug-In Detectors
Installation and Maintenance Instructions: 1251B Plug-in Intelligent Ionization Sensor with Communications


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