MRI-2251TMB 200 Series Dual Photo, Heat Intelligent Sensor

Model MRI-2251TMB is a photoelectric smoke detector with supplementary 135°F thermal. Also known as Acclimate™, it uses advanced on-board software to combine the signals from the photo and thermal elements.

The MRI-2251TMB is a true multicriteria detector capable of rejecting nuisance sources, but still responding quickly to real fires. Acclimate has the capability of adjusting its sensitivity according to the type of environment that it is installed in.

Plug-in. Requires a Low Profile 200 Series Base.


  • Sleek, low profile design
  • Detectors are equipped with a built-in analog communications module
  • Smoke detectors are available with photoelectric or ionization technology
  • Photoelectric detectors are available with additional fixed temperature detection
  • Heat detectors are available as fixed temperature or fixed temperature with rate-of-rise detection
  • Dual LEDs indicate communications and activate steady when in alarm
  • Low profile base provides easy interchangeability
  • Low standby current
  • Rotary address switches
  • Magnetic test feature
  • Superior EMI protection
  • Sealed against dirt, insects, and back pressure