Confirmed Temperature Initiation (CTI)

Confirmed Temperature Initiation (CTI)

Safety Tech Innovation Inc.

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The CTI Linear Heat Detector is a twisted pair of dissimilar spring conductors which are insulated with a heat-sensitive material. This material is designed to soften and allow the conductors to short when exposed to a specific alarm temperature. The dissimilar conductors, when shorted, form a temperature measurement junction called a thermocouple.


Features of Protectowire’s CTI Linear Heat Detector also include:

  • Temperature verification and short circuit discrimination
  • Multi-criteria detector
  • Engineered and designed for use with suppression systems
  • Approved for use in hazardous locations
  • Detector MUST be connected to a CTM-530 interface module
  • CTM-530 is a four-wire device that is compatible with any manufacturer control panel
  • CTM-530 provides integrated alarm point location
  • CTM-530 control module can support up to 4000 feet (1220 meters) of CTI Linear Heat Detector per zone
  • Available in a wide range of operating temperatures and outer jackets
  • Easy to install, test, and splice


CTI Linear Heat Detector (CTI & CTM-530)

Using thermocouple technology, the CTI Linear Heat Detector can distinguish between a short caused by physical damage or a short caused by heat actuation. Dissimilar metal conductors enable the CTI Linear Heat Detector to determine the exact alarm point location as well as the temperature of any short. If the temperature of the short is below the linear heat detector’s fixed temperature, a short fault or trouble condition is initiated. If the temperature of the short is above the linear heat detector’s fixed temperature, an alarm condition is initiated.

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