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CTI stands for Confi rmed Temperature Initiation and 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 provides for short circuit discrimination.
CTI confi rms thermal activation of the Digital Linear Heat Detector before an alarm is initiated thereby re-
ducing 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 provide Short
Circuit Discrimination.
Introduction to CTI™ Technology
How CTI™ Technology Works
Digital Linear Heat Detection Operation
To understand how CTI technology works it is important to have an understanding of how traditional digital
linear heat detectors operate.
Figure 1 - Traditional digital linear heat detectors are constructed of a twisted pair of spring conductors coated
with a thermoplastic coating designed to soften at a specifi c temperature. An initiating device circuit monitors
a length of this detector installed in an area to be protected.
Monitor
Circuit
End Line
Resistor
Heat Sensitive
Insulation
Normal
G
Figure -1
Figure 2 - Traditional digital linear heat detectors are constructed of a twisted pair of spring conductors coated
with a thermoplastic coating designed to soften at a specifi c temperature. An initiating device circuit monitors
a length of this detector installed in an area to be protected.
HEAT
Monitor
Circuit
End Line
Resistor
Heat Sensitive
Insulation
Alarm!
R
Figure - 2
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