MRI-2251TB Low Profile Intelligent Photoelectric Sensor

Model MRI-2251TB adds dual electronic thermistors to the MRI-2251B to provide 135°F (57°C) fixed temperature thermal sensing.

135 Fixed Thermal Detector. 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