Secutron's low profile addressable plug-in smoke and heat detectors with integral communications provide features that surpass conventional detectors. Sensitivity is continuously monitored and reported to the panel where the desired detector sensitivity can be programmed. Point ID capability allows each detector’s address to be set with decade address switches, providing exact detector locations for selective maintenance when chamber contamination reaches an unacceptable level.






Model MRI-2251B photoelectric smoke detector provides a unique optical sensing chamber that senses smoke produced by a wide range of combustion sources.

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

Model MRI-2251TMB is a multi-criteria photoelectric smoke detector with supplementary 135°F thermal sensing. It uses advanced on-board software to combine the signals from the photoelectric and thermal elements. This software creates a multi-criteria detector capable of rejecting nuisance sources but still responding quickly to real fires. Additionally, this model also adjusts its sensitivity according to the local installed environment.

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

Model MRI-5251B uses an innovative thermistor sensing circuit to produce 135°F fixed temperature detection in a low profile package. These thermal detectors provide cost effective, intelligent property protection in a variety of applications.

Model MRI-5251RB provides both 135°F fixed and rate-of-rise thermal detection. These thermal detectors provide cost effective, intelligent property protection in a variety of applications. Model MRI-5251H provides 190°F (88°C) fixed temperature detection for high temperature applications. 

Features

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 or with multi-criteria photo/heat detection operation
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

Must be used with one of the following bases.

MRI-B210LP Flanged Mounting BaseMRI-B501 Flangeless Mounting Base
MRI-B501BH Sounder Base
MRI-B501BHT Temporal Tone Sounder Base
MRI-B224RB Relay Mounting Base, Form C Contact
MRI-B224BI Isolator Mounting Base
RMK400 Recess Mounting Kit
SMK400 Surface Mounting Kit, Flangeless
SMB600 Surface Mounting Kit, Flanged
MRD-F110 Retrofit Replacement Ring for MRI-B501B Base