Heat detectors can be categorized as fixed temperature, rate compensation or rate-of-rise design and may be spot or line type.

The 600 Series Heat Detectors are attractive, durable and  feature combination rate-of-rise and fixed temperature  operation. The 600 Series heat detectors are available  in 135°F(57°C) and 200°F (93°C) temperature ratings.   Rate-of-rise detects heat by quickly responding to a rapid  temperature increase. Rate-of-rise units have a wide spacing  allowance of 50-foot centers. See specification table for  details.  Fixed temperature reacts to heat by responding to a  specific temperature setting.  The 600  Series detectors use  the same reliable pneumatic rate-of-rise element of former  models, but offer added aesthetic appeal.

The pneumatic rate-of-rise element responds to a rapid rise  in temperature, approximately 15°F (8°C) per minute, by  expansion of air within the sealed chamber faster than it can  escape through a calibrated vent. The resultant increase in  pressure depresses the diaphragm, causing the electrical  contact to close the circuit.  The fixed temperature element  uses a fusible alloy.  When activated, the external heat  collector drops away to provide quick visual confirmation  that the element has operated.  The units protrude only 1-3/8  inch from the ceiling surface with a junction box mounting.  They have pleasing contours and an all-white finish that  conforms to ceiling aesthetics.

The CR and CF-MP Series Moisture Proof Detectors are  designed for hazardous locations and Moisture Proof  applications. Each Moisture Proof detector is available in  single or multiple circuits with open and/or closed contact  configurations, and any of the fixed temperature settings  including 135, 165, 200 and 285 degrees Farenheit.

The Moisture Proof detector is characterized by a black  phenol-plastic seal plate and black and white pigtail  connections. It is specified for use in high humidity  environments and areas that are subject to corrosive  elements or spray washing. The suffix “MP” denotes  “Moisture Proof”.

CR-135MP
The Model CR-135MP is a combination Rate-of-Rise  and Fixed Temperature detector.  A set of normally  open contacts will close when the ceiling temperature  increases at a (minimum) rate of 8.4°C (15°F) per  minute.  Closing the contacts initiates the fire alarm  sequence. Independent of the rate-of-rise operation, the  fixed temperature portion consists of a spring-loaded  plunger retained by a fusible alloy that releases when  the ceiling temperature reaches 135°F (57°C). When  released, the plunger strikes the contacts and holds  them closed.  Spacing on an uninterrupted ceiling is 70  ft. (21.3m) for the rate-of-rise; 40 ft. (12.2m) for the fixed  temperature portion.

CF-135MP
The Model CF-135MP is a Fixed Temperature Only  detector. The fixed temperature portion consists of a  spring-loaded plunger retained by a fusible alloy that  releases when the ceiling temperature reaches 135°F  (57°C).  When released, the plunger strikes a normally  open set of contacts and holds them closed. Spacing on  an uninterrupted ceiling is 40 ft. (21.3m).  The CF-135MP  is identified by a black dot on its heat collector fin.

CR-200MP
The Model CR-200MP is a combination Rate-of-Rise  and Fixed Temperature detector that operates in the  same way as the CR-135MP, with the exception that  the fixed temperature portion releases when the ceiling  temperature reaches 200°F (93°C).  Spacing on an  uninterrupted ceiling is 70 ft. (21.3) for the rate-of-rise,  and 25 ft.(7.6m) for the fixed temperature portion (a  reduced spacing parameter from the CF-135MP).   The CR-200MP is identified by a white dot on its heat  collector fin.

CF-200MP
The Model CF-200MP is a Fixed Temperature Only  detector.  The fixed temperature portion releases when  the ceiling temperature reaches 200°F (93°C). Spacing  is 25 ft., (7.6m).  The CF-200MP is identified by a black  dot and a white dot on the heat collector fin.

 
The  5451  plug-in  heat  detectors  are  designed  to  meet  the  performance  criteria  designated  by  UL/ ULC.  Additional  key  features  include  a  recessed  mounting  option,  interchangeable  ion,  photo,  or  thermal detectors, a variety of mounting bases, and a  full line of optional accessories.

The 5451 thermal rate-of-rise with fixed heat detector  contains a unique dual thermistor heat sensing circuit  to  provide  maximum  performance  and  solid  state  reliability. The 5451 is designed to initiate an alarm  at 57°C (135° F) and to respond to an increase in excess of 8°C (15°F) per minute. 

This enables the heat detector to communicate an  alarm to the central control panel prior to reaching the  static set point for these high rates of rise, providing  a timely response to both rapid and slow temperature  increases. This model should be used in applications  where rapid response is desired and where rapid  temperature increases would only be caused by a  fire emergency.

The 5451 detector appears the same as a conventional  two wire smoke detector to the fire panel; this requires  that the 5451 heat detector be connected to a smoke  detector circuit from the fire alarm control panel. 

Addressable heat detectors appear similar to the 5451 series.

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.