Confirmed Temperature Initiation (CTI)

Confirmed Temperature Initiation (CTI)

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.

  • Outermost layer providing mechanical and environmental protection to the linear heat detector.
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  • A detector's fixed activation temperature.
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    Protectowire’s CTI Linear Heat Detector is the only digital type linear heat detector capable of distinguishing between short circuits from mechanical damage and temperature-initiated alarm conditions.

    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.

    FAQ's
    Are CTI Linear Heat Detectors compatible with standard mounting hardware?
    Yes. All Protectowire CTI Linear Heat Detectors are compatible with the same mounting hardware and fixings used for our standard Digital Linear Heat Detectors. The only exception is that all terminations must be made using “T” type thermocouple terminal blocks. Protectowire provides a full line of splicing terminals and junction boxes specifically designed to be compatible with our CTI Linear Heat Detectors .
    Can CTI Linear Heat Detectors Be Installed in Classified Hazardous Locations?
    Yes, but only when using the CTM-530E-I interface module and if the installation is in compliance with Protectowire Control Drawing IL-1622. The CTM-530E-I is FM-approved and provides intrinsically safe connections suitable for monitoring CTI Linear Heat Detectors installed in Class I, II or III, Division I, applicable groups A, B C, D, E, F and G classified areas. Protectowire Control Drawing IL-1622 provides instruction on how to properly install both the CTM-530E-I and CTI Linear Heat Detector to comply with the requirements for intrinsically safe circuitry.
    Do CTI Linear Heat Detectors require compatible field wiring?
    Yes. Typically the CTI Linear Heat Detector will connect directly to the CTM-530 Interface Module. When this is not possible, “T” type extension cable can be used to connect the CTI Linear Heat Detector to the CTM-530 Interface Module. For all CTI type detectors, twisted “T” type extension grade thermocouple wire is required for use as interconnecting wire on the detection circuit. Minimum conductor size is 20AWG (0.812mm), or as required by local code.
    Does the CTI Linear Heat Detector require compatible termination hardware?
    Yes. CTI Linear Heat Detectors are constructed using “T” type thermocouple conductors which require all terminations be made via “T” type thermocouple terminals. This is to ensure the temperature measurements made by the CTM-530, which provide short circuit discrimination, are as accurate as possible. Protectowire provides a full line of splice terminals and junction boxes specifically designed for compatibility with our CTI Linear Heat Detectors.
    Is a CTI Linear Heat Detector compatible with other initiating devices?
    No. Unlike our Digital (PHSC) Linear Heat Detector, which is compatible with any normally open switch type initiating devices, CTI Linear Heat Detectors are not. Only CTI Linear Heat Detectors can be monitored by the CTM-530 Interface Module.

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