Confirmed Temperature Initiation (CTI)
The Protectowire Company is proud to announce the latest innovation in Linear Heat Detection, Confirmed Temperature Initiation or CTI.
CTI is a new Digital Linear Heat Detection technology created and patented by The Protectowire Company. This technology is an enhancement to traditional digital linear heat detection technology and enables short circuit discrimination.
CTI confirms thermal activation of the Digital Linear Heat Detector before an alarm is initiated thereby reducing the incidence of false alarms created by physical damage to the detector. Protectowire CTI Digital Linear Heat Detectors are the only digital linear heat detectors to feature Short Circuit Discrimination.
Frequently Asked Questions
The main benefit of CTI technology is short circuit discrimination or the ability to distinguish between thermal activation of the detector and a mechanical short caused by physical damage. This feature greatly reduces the potential for false alarms. Along with this unique feature our CTI linear heat detectors also afford all the benefits of our standard Digital Linear Heat Detectors such as…
Line coverage provides superior sensitivity.
- Compatible with virtually any fire alarm control panel.
- Alarm Point Location.
Suitable for installation in severe environmental conditions.
Easy to install, test, and splice.
CTI technology is an enhancement to standard digital linear heat detection operation. Where traditional digital linear heat detectors have a single mode of detection, CTI digital linear heat detectors add a second mode of detection. This second mode of detection utilizes the thermo-electric effect to measure the temperature at the short circuited point of the detector to confirm a true alarm condition exists.
CTI digital linear heat detectors are constructed of a twisted pair of dissimilar metal spring conductors coated with a thermoplastic coating designed to soften at a specific temperature. An initiating device circuit monitors a length of this detector installed in the area to be protected.
When a short occurs at a point along the detectors length the initiating device circuit of the CTM-530 Interface Module detects the short and then automatically switches to a thermocouple measurement mode. The shorted portion of the detector forms a thermocouple junction and it’s temperature can be measured. The thermocouple measurement represents the current temperature of the shorted portion of detector. If the short is below the pre-set alarm threshold for the installed detector, a short fault is reported instead of an alarm condition. If the short is above the pre-set alarm threshold for the installed detector an alarm condition is reported immediately.
Currently the CTI product line carries Factory Mutual Approval, Underwriters Laboratories Listing & California State Fire Marshal (CSFM) Approval.
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. The Protectowire Company provides a full line of splice terminals and junction boxes specifically designed for compatibility with our CTI linear heat detectors.
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. The Protectowire Company provides a full line of splicing terminals and junction boxes specifically designed to be compatible with our CTI linear heat detectors.
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.
Explanation: CTI linear heat detectors are constructed using “T” type thermocouple conductors which require all wiring between the CTM-530 Interface Module and the CTI Linear Heat Detector be made with compatible “T” type extension grade thermocouple wire. This is required to ensure the temperature measurements made by the CTM-530 which provide short circuit discrimination are as accurate as possible. Please read the CTM-530 Installation & Operation manual for more information.
No. Unlike our standard Digital 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.
Yes, but only when using the CTM-530E-I interface module and 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 to properly install both the CTM-530E-I and CTI linear heat detector to comply with the requirements for intrinsically safe circuitry.
Introduction to CTI Video
Click here to view a video introducing Protectowire CTI Series Linear Heat Detectors.
- CTI technology Provides short circuit discrimination greatly reducing false alarms
- Detects at any point along its length providing uniform sensitivity.
- Available in a wide range of operating temperatures and outer jackets.
- CTM-530 interface module is compatible with any manufacturers control panel
- CTM-530 Provides integrated alarm point location.
- CTM Series CTM-530 Interface Module Datasheet
- CTM Series Linear Heat Detectors Datasheet
- CTM Series Linear Heat Detectors and CTM-530 Module Datasheet – En Espanol
- CTM-530 Interface Module Installation & Operation Manual
- CTI Series Installation Information Form
- CTI Series Linear Heat Detector Splicing Instructions