Protectowire 2000 FireSystem Bedienungsanleitung PDF herunterladen (Seite 4)

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Since The Protectowire Company introduced

the first Linear Type Heat Detector in the United

States over 70 years ago, this type of detector,

with its unique characteristics, has been

employed in applications where it has proven

to be a highly reliable form of fire detection.

The construction and operating principles of

the various linear heat detectors that are avail-

able today, can with few exceptions, be classi-

fied in the following major categories:

Analog (Integrating) Linear Type Heat

Detectors -

These detectors are composed of sensing ele-

ments whose response to temperature is

summed in some way along the length of the

entire cable. The resistance of the insulation

between the conductors is monitored by a

control unit which may have adjustable alarm

threshold settings.

Typically, as the temperature of the cable

increases, the wire’s resistance will decrease.

When the preset alarm threshold is reached an

alarm condition is signaled by the control unit.

Digital Linear Type Heat Detectors -

Digital type detectors, such as Protectowire,

consist of sensing elements which respond to

a specific temperature at any point along their

length. The inner conductors are coated with

a polymer that melts at a predetermined tem-

perature which allows the conductors to

make contact with one another and thereby

signal an alarm condition.

While several other types of sensing technolo-

gies, such as fiber optics and pressurized

pneumatic tubing are also in use, the two

product categories stated above are the most

widely used today.

The present NFPA 72 National Fire Alarm and

Signaling Code, provides basic information on

the application of linear heat detectors such as

location and spacing distances for area protec-

tion. The ability to correctly engineer the appli-

cation of these detectors to special hazards,

however, is provided mainly by the manufac-

turers who have developed this technology

and expertise over the years.

In view of these factors, the purpose of this

manual is to ensure that coverage of the area to

be protected is in accordance with accepted

fire protection principles and to provide uni-

form installation guidance. Whenever there is a

choice between two or more possible proce-

dures, the one which results in increased pro-

tection should be followed. Also discussed will

be the operating characteristics of the

Protectowire sensor and the environmental

factors which may influence its operation.

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Protectowire Linear Heat Detector is com-

prised of two steel conductors individually

encased in a heat sensitive polymer. The

encased conductors are twisted together to

impose a spring pressure between them, then

spirally wrapped with a protective tape and

finished with an outer jacket to suit the instal-

lation environment.

The Detector’s current product range consists

of five distinct types of cable. Each designa-

tion identifies a specific model type and outer

jacket material which has unique characteris-

tics that have been selected to accommodate

the widest range of installation environments.

EPC - Type EPC consists of a durable vinyl

outer jacket. This series is best described as

multipurpose and is well suited to a wide

range of both commercial and industrial appli-

cations. The outer jacket provides good all-

around performance for most installations. It

features low moisture absorption, resistance to

many common chemicals, excellent flexibility

at low temperatures and is flame retardant.

EPR - The EPR series contains an extruded

flame retardant polypropylene based jacket

with a special UV stabilizer added to enhance

weathering performance. It is intended for a

wide range of industrial applications and is

characterized by high resiliency, good abra-

sion resistance, excellent weathering proper-

ties, and good high temperature performance.

TRI - Protectowire Type TRI, (TRI-Wire™) is a

unique dual temperature detector which is

capable of initiating separate pre-alarm and

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