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The Protectowire
Alarm Point Location Meter
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An exclusive feature of Protectowire FireSystem
control panels, the alarm point location meter is designed to locate a heat
actuated point on a length of Protectowire Linear
Heat Detector. The Meter provides a means to display
the alarm point location, represented as a linear
distance in Feet or Meters, from the start of the
Protectowire portion of the circuit to the heat
actuated alarm point on the detector.
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Electrical Characteristics of Protectowire
Linear Heat Detector
Alarm
Point Location is made possible by
Protectowire Linear Heat Detectors
electrical resistance characteristic. The
detectors steel conductors have a high
resistance per foot compared to the copper
feed wires connecting the detector to the
control panel. This resistance can be
measured and used to determine the length of
the detector.
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Alarm Point Location Setup
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Each Protectowire zone is field
calibrated after installation to eliminate copper
feed cable resistance from the Alarm Point Location
reading. This is done by manually shorting the
detector at the beginning of the zone and adjusting
the display to zero "0000". |
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Alarm Point Location
Reading
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When an overheat (alarm) occurs in a
zone, an alarm point reading is taken either
*manually or *automatically at the control panel.
This reading represents the linear distance to the
actuated point along the detectors length. |
 
* = Determined by control panel type
and options ordered |
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Zone Mapping
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When a Protectowire Linear Heat
Detection System using the Alarm Point Location
Meter is first brought online, points along the
detector correlating to a floor plan or installation
detail can be temporarily shorted an measured.
Each
distance reading can then be marked on the floor
plan or detail at it's corresponding point. In the
future, a reading of the Alarm Point Location Meter
can be referenced on the floor plan or detail,
making location of the overheated (alarm) portion of
the wire easier to locate. |
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