Heat detectors

Heat detectors have two main classifications of operation, “Rate of Rise” and “Fixed temperature” and are used in kitchens, car parks, loading bays and any area where combustion by product may occur.

—Fixed temperature heat detectors operate when the ambient temperature increases sufficiently to predetermined level where the heat detector will operate; or

—A rate-of-rise heat detector operates when the ambient temperature increases over time equal to or greater than the rate of change the detector was manufactured to operate.

    Suggested systems

  • Fixed temperature
  • Fixed temperature heat detectors detect heat using thermistor technology to provide a reliable response to fire in areas where environmental conditions prohibit the use of smoke detection. Most are low profile design with red LED and automatic locking plug-in base. The usual operating temperature is fixed at 58°, but other temperatures are available.


  • Rate of rise
  • Rate-of-Rise (ROR) heat detectors operate on a rapid rise in element temperature of 12° to 15°F (6.7° to 8.3°C) increase per minute, irrespective of the starting temperature. This type of heat detector can operate at a lower temperature fire condition than would be possible if the threshold were fixed. It has two heat-sensitive thermocouples or thermistors. One thermocouple monitors heat transferred by convection or radiation. The other responds to ambient temperature. Detector responds when first’s temperature increases relative to the other.

    Rate of rise detectors may not respond to low energy release rates of slowly developing fires. To detect slowly developing fires combination detectors add a fixed temperature element that will ultimately respond when the fixed temperature element reaches the design threshold.


  • Linear heat detection
  • Rate of rise detectors may not respond to low energy release rates of slowly developing fires. To detect slowly developing fires combination detectors add a fixed temperature element that will ultimately respond when the fixed temperature element reaches the design threshold.


  • Beam detection
  • Beam detection has become commonplace within large open areas, such as atriums, warehouses, etc. Beam Detectors are cost effective when compared with using point detection and suitable for heights way above the operating limits of conventional smoke detection. A device which senses smoke by projecting a light beam from a transceiver unit across the protected area to a reflector that returns the light signal back to the transceiver unit. Smoke entering the beam path will decrease the light signal causing an alarm.

    Beam Detection is perfect for applications in environments like atriums, freezers, aircraft hangars, cold storage warehouses, shipping warehouses, enclosed parking facilities, sporting arenas, stadiums, concert halls, barns, and tunnels.

    High air movement areas present a special problem for spot-type detectors, because the propagation of smoke developing under normal conditions may not occur. Since high air velocity may blow smoke out of the sensing chamber, careful consideration should be given to the spot-type detector’s performance where air velocities exceed 1,500 feet per minute.


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“DAS Fire have been servicing my fire Suppression system and when we had a system discharge there team had our system back up and running again in 48 hours, truly impressive.”
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DAS Fire have a network of Engineers throughout the UK and are able to service a wide range of systems from most manufacturers

For more information call : 0845 544 2316