6592 Linear heat Detector.qxd
Protectowire Linear Heat Detector
• Line coverage…continuous sensitivity.
• Six alarm temperature ratings.
• Withstands severe environmental conditions.
• Approved for hazardous locations.
• Easy to install, test, and splice.
• Compatible with other initiation devices on same circuit.
• Approved for up to 50 ft. (15.2m) spacing.
Protectowire Linear Heat Detector is a proprietary cable that detects
heat anywhere along its length. The sensor cable is comprised of two
steel conductors individually insulated with a heat sensitive polymer.
The insulated conductors are twisted together to impose a spring pressure between them, then wrapped with a protective tape and finished
with an outer jacket suitable for the environment in which the
Detector will be installed.
Protectowire is a fixed temperature digital sensor and is therefore capable of initiating an alarm once its rated activation temperature is
reached. At the rated temperature, the heat sensitive polymer insulation
yields to the pressure upon it, permitting the inner conductors to move
into contact with each other thereby initiating an alarm signal. This
action takes place at the first heated point anywhere along the
Detector’s length. It does not require that a specific length be heated in
order to initiate an alarm nor is system calibration necessary to compensate for changes in the installed ambient temperature. Protectowire
Linear Heat Detector provides the advantages of line coverage with
point sensitivity.
An ISO 9001:2008 Registered Company
the first name in linear heat detection.
Protectowire F eatures & Benefits
• Identifies and displays, at the control panel, the alarm location
anywhere along its length when used with the exclusive
Protectowire Alarm Point Location Meter.
• Sensitivity not effected by changes in ambient temperature or
length of cable used on the detection circuit. Compensating
adjustments are not required.
• Simple to install and splice with common tools. Junctions can
be made without effecting the integrity of the system.
Heat sensitive polymer
Protective tape
Outer covering
• Compatible with other types of alarm initiating devices on the
same circuit such as manual pull stations, thermal heat detectors and smoke detectors.
• Can be installed in hazardous areas when used with suitably
approved Protectowire FireSystem Control Panels.
• Full range of temperatures and models available to accommodate the most demanding applications.
• Different temperature detectors may be utilized in the same
initiating circuit.
5/32" (4mm) diameter
• Available on stainless steel messenger wire for installations
where mounting is difficult such as large open areas.
• Portable test equipment available for easy field service.
• Ideally suited for activation of extinguishment equipment,
such as deluge or pre-action sprinkler systems.
• Cable trays
• Conveyors
• Power distribution apparatus: switchgear, transformers,
motor control centers
• Dust collectors/baghouses
• Cooling towers
• Warehouses/rack storage
• Mines
• Pipelines
• Bridges, piers, marine vessels
• Refrigerated storage
• Tank farms
• Aircraft hangars
Ideally suited to industrial high risk hazards as well as many types
of commercial applications, Protectowire Linear Heat Detector has
unique advantages over other types of detectors, especially when
difficult installation factors or severe environmental conditions are
When used with a Protectowire FireSystem Control Panel, the
Detector will activate a display, showing the location of an over
heat or fire condition anywhere along its length. The Detector
also meets intrinsically safe standards and is FM Approved for Class I,
II, or III, Div. 1, Applicable Groups A, B, C, D, E, F & G hazardous
areas, when the appropriate control panel option is ordered.
The Detector is made in multiple temperature ratings to allow
for differences in normal ambient temperature. Guidelines for selecting the proper detector temperature rating are the same as for automatic sprinklers and other heat actuated devices. Refer to the
Temperature Rating Chart for proper model selection based upon
installation temperature limits.
The Detector's product range consists of two distinct types of cable.
Standard PHSC models and low resistance "Universal" versions designated with the prefix PLR. Each model number designation also identifies a specific outer jacket material carefully selected to accommodate
the widest range of installation environments. All specifications are
subject to change without notice.
EPC – Type EPC Protectowire consists of a durable flame retardant
vinyl outer jacket. This series is best described as multi-purpose and is
well suited to a wide range of both commercial and industrial applications. The outer jacket provides good all-around performance for most
installations. It features low moisture absorption, resistance to many
common chemicals, and excellent flexibility at low temperatures.
XCR – Type XCR utilizes a high performance fluoropolymer jacket.
This detector is specifically designed for use in applications where
extreme environmental and product performance criteria must be met.
In general, the flame retardant, low smoke XCR jacket provides excellent abrasion resistance and mechanical properties over a broad range
of temperatures. It provides excellent chemical and permeation resistance to a wide variety of acids, bases, and organic solvents as well as
simple gases. In addition, the jacket exhibits very little change in tensile properties upon outdoor exposure to sunlight and weather.
XLT – Protectowire Type XLT is a unique detector that has been
designed for use in cold storage facilities and other applications that
require a low alarm activation temperature. The outer jacket consists
of a proprietary flame retardant polymer that is specifically formulated
to provide low moisture absorption, good chemical resistance, and
excellent low temperature environmental performance.This detector has
been UL and FM tested to –60˚F (–51˚C).
PLR-R – The Protectowire PLR models are manufactured with special
low resistance tri-metallic inner conductors that enable the use of
longer detector zone lengths on most types of fire alarm panels including addressable. The outer jacket consists of an extruded flame retardant thermoplastic elastomer with a special UV stabilizer added to
enhance weathering performance. It is intended for a wide range of
industrial and commercial applications and is characterized by high
resiliency, good fluid resistance, excellent weathering properties, and
flexibility over a wide temperature range.
When Protectowire is used to activate sprinkler systems, special Factory
Mutual (FM) spacing guidelines may also be applicable to the specific
hazard being protected. It is mandatory that engineering judgment be
applied in determining final detector location and spacing.
In general, the use of Protectowire in any initiating device circuit, is
limited to coverage of a specific hazard or area. Copper wire, of an
approved type, with a minimum conductor size of 18 AWG, shall be
Protectowire Linear Heat Detector is approved as a heat actuated automatic fire detector and is intended to be used on a supervised initiating
circuit of an approved fire protective signaling control unit. The
Detector must be installed in continuous runs without taps or branches
in accordance with applicable sections of NFPA 70 National Electrical
Code, NFPA 72 National Fire Alarm Code, or as determined by the
local “authority having jurisdiction.”
Protectowire may be installed at the ceiling level or on the side walls
within 20 inches of the ceiling, to protect areas within buildings (area
protection). The Detector has the additional benefit of being suitable
for installation close to the hazard in order to provide a rapid response
(proximity or special application protection).
On smooth ceilings, the distance between detector runs shall not
exceed the listed spacing. There shall be a detector run within
a distance of one-half the listed spacing, measured at a right angle,
from all walls, or partitions extending to within the top 15% of the
ceiling height as shown in the illustration.
Ceiling of protected area
S=Listed spacing. See chart below.
installed from the control panel out to the hazard area where it is then
connected to the beginning of the Protectowire portion of the circuit.
The Protectowire portion of each initiating circuit shall begin and terminate at each end in an approved zone box or end-of-line zone box.
SR-502 Series, Strain Relief Connectors, shall be installed in all zone
boxes where Protectowire enters or exits the enclosure, in order to hold
the cable securely.
The listed spacing shall be used as a guide or starting point in detector
installation layout. Reduced spacing is required based upon factors
such as ceiling height and construction, physical obstructions, air
movement, or the authority having jurisdiction.
Temperature Ratings and Model Numbers (Use Linear Detector of Proper Temperature Rating)
Product Type
Commercial &
High Performance/
Industrial Applications
Excellent Abrasion &
Chemical Resistance
Excellent Low Temp.
Good Weathering
Properties & Flexibility
Over a Wide Temperature
Model Number
Alarm Temperature
Max. Recommended
Ambient Temperature
Approvals/Max. Listed Spacing
155˚ F (68˚ C)
190˚ F (88˚ C)
220˚ F (105˚ C)
280˚ F (138˚ C)
356˚ F (180˚ C)
115˚F (46˚C)
150˚F (66˚C)
175˚F (79˚C)
200˚F (93˚C)
221˚F (105˚C)
50 ft. (15.2m)
50 ft. (15.2m)
50 ft. (15.2m)
50 ft. (15.2m)
50 ft. (15.2m)
30 ft. (9.1m)
30 ft. (9.1m)
25 ft. (7.6m)
25 ft. (7.6m)
See Note 1
155˚ F (68˚ C)
190˚ F (88˚ C)
220˚ F (105˚ C)
280˚ F (138˚ C)
356˚ F (180˚ C)
115˚F (46˚C)
150˚F (66˚C)
175˚F (79˚C)
200˚F (93˚C)
250˚F (121˚C)
50 ft. (15.2m)
50 ft. (15.2m)
50 ft. (15.2m)
50 ft. (15.2m)
50 ft. (15.2m)
30 ft. (9.1m)
30 ft. (9.1m)
25 ft. (7.6m)
25 ft. (7.6m)
See Note 1
135˚ F (57˚ C)
100˚F (38˚C)
50 ft. (15.2m)
30 ft. (9.1m)
155˚ F (68˚ C)
190˚ F (88˚ C)
115˚F (46˚C)
150˚F (66˚C)
50 ft. (15.2m)
50 ft. (15.2m)
30 ft. (9.1m)
30 ft. (9.1m)
Note 1: FM Approved for special application use only.
All Protectowire models can be supplied on Messenger Wire. Add suffix “-M” to above model numbers.
Maximum Voltage Rating:
Resistance PHSC Models:
Resistance PLR Models:
Min. Bend Radius:
30 VAC, 42 VDC
.185 ohms/ft. (.607 ohms/m)
.058 ohms/ft. (.191 ohms/m)
2.5 inches (6.4cm)
Nominal 5/32 inch (4mm)
Nominal 8lbs./500 ft.
(3.6 kg/152m)
Installation Accessories
A comprehensive range of mounting and installation accessories are
available for the installation of Protectowire Linear Heat Detector.
These include several types of clips, straps, drive rings, beam clamps,
cable standoffs, connectors and zone boxes. Their proper use assures a
neat and reliable installation. Only installation hardware supplied or
approved by The Protectowire Company should be used.
Messenger wire is also available for any model Detector on special
order. It consists of high tensile strength stainless steel wire, which is
wound around the Detector at the rate of approximately one turn per
foot. It is a carrier or support wire which is designed to simplify the
installation of the Detector in areas where mounting is difficult due to
the lack of appropriate support structures or mounting surfaces. When
using messenger wire to support the Detector, turnbuckles and eyebolts must be employed at each end of a run to place tension on the
support wire. The maximum Detector run length between turnbuckles
should not exceed 250 feet (76m) and the wire must also be supported
with approved intermediate fasteners at intervals ranging from 15 feet
(4.5m) to 50 feet (15m) depending upon the application. Outdoor
messenger wire installations present additional challenges due to environmental factors such as snow loads, ice build-up or wind. Increased
detector support must be provided by using additional intermediate
fasteners with closer spacing in all outdoor installations. When ordering messenger wire configurations, add suffix “-M” to the Protectowire
model number.
All models of Protectowire Linear Heat Detector have the same size
conductors and are readily spliced together with common tools, by
means of PWSK-3 or PWSC Splicing Connectors. These devices are
designed for this specific purpose and are the only approved methods
of splicing the Detector.
System Capabilities
Protectowire Linear Heat Detector is a component of a complete family of systems manufactured by The Protectowire Company —
a leader in fire detection for over seventy five years.
Protectowire fire detection systems provide a complete single source
solution for meeting any fire defense need, from hazardous area detection to auxiliary equipment shutdown, and automatic extinguishing
The Protectowire Company offers an assortment of fasteners and splicing devices to facilitate installation for both standard and special applications. Full details are available upon request.
Pipe Strap
Flexible Lead
WAW Clip
Stainless Steel Line Clip
Cable Tray Clip
Cable Tray Clip
Beam Clamp
The Protectowire Company, Inc.
©2015 The Protectowire Co., Inc.
Splicing Connector
60 Washington Street, Pembroke, MA 02359, U.S.A. n p:781-826-3878
web: www.protectowire.com n email: [email protected]
DS 6592Y-0715 (2C)
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