Digital Line Heat Detector & Fire Sensor
The Patol Digital
Linear Heat Detectors are designed to provide early detection of fire conditions
and overheating in circumstances where other forms of detection would
not be viable, either due to inability to sustain the environmental requirements
or through prohibitive costs.
Extensive single zonal lengths of the Linear Heat Detector (LHD)
may be installed with the ability to trigger alarms for ‘hot spots’ occurring
on very small sections of the overall cable.
The LHDC may be employed in a wide variety of applications but is particularly
suited where there is a harsh environmental condition, a physical or hazardous
maintenance access constraint to the protected area, and/or a requirement
to cost effectively install detection in close proximity to the risk(s)
- Early detection of hazards at temperatures well below flame point.
- Rugged construction for use in harsh environments.
- Ease of installation - wide range of fixings available.
- Compatible with many existing zone monitors / control equipments.
- Fixed Alarm Trigger Temperature
- Intrinsically Safe configurable for Hazardous Areas.
- Compliant with industry standards (e.g. CEGB GDCD-187)
- Extensive range of proven applications.
- UL Approved and Listed.
The primary mechanism of heat (fire) detection is that inner core insulating polymer is specially formulated such that it plasticizes at a specific temperature. The cable is constructed such that the twisted steel cores are in tension, and at the polymer trigger temperature the conductors connect. This provides an alarm signal to any associated monitoring device.
The LHDC may be used as a simple switch to operate a relay etc. However in most fire alarm installations the minimum requirement is that the LHDC circuit is monitored for disconnections by means of an End Line (EOL) device and an appropriate Fire Alarm Channel or Address Loop interface unit.
Patol can provide more sophisticated monitoring schemes that can discriminate and identify Zone / Area alarm initiations whilst maintaining a single length of LHDC.
PASSIVATED
STEEL
CONDUCTORS
TEMPERATURE
REACTIVE
POLYMER
INSULATION
OUTER
PROTECTIVE
SHEATH
* Escalators & Moving Walkways
* Petro-Chem Storage Tank Rim Seals
* Shops & Spray Booths
* Conveyors - Coal, Wood, Sulphur, etc..
* Ceiling Voids & Attic Spaces
* Road & Rail Tunnel Carriageways
* Nuclear Reactor Plant Areas
* Refrigerated Stores & Cold Rooms
* Electrical Control & Switchgear Cabinets
* Warehouse High Rise Pallet Racking
* Oil Rigs & Off Shore Platforms
* Fume Cupboards & Glove Boxes
* Grain Silos & Agricultural Storage
* Road / Rail Vehicle Engine Compartments
* Steam Pipe Leaks & Trace Heating Faults
* Product Lines - Flanges, Valves & Pumps
* Computer Room Under Floor Cable Voids
The detector is particularly suited to applications where harsh environmental conditions preclude the use of other forms of detection.
The low maintenance requirement of the detector provides a unique solution to fire detection in areas that have access restrictions due to either physical difficulties or personnel health risk.
The cable may be installed in Hazardous Areas by means of Intrinsically Safe Zener Barriers. When the protected area is remote from the monitoring equipment ‘interposing’ cables may be employed.
See Following Figure.
The LHDC can
be provided in a variety of constructional configurations that will meet
the requirements of both standard and special applications.
These include:-
High Temperature Ambient / Trigger LHDC
Specific sheath materials especially resistant to unusual environments.
Overbraids to customer / application requirements.
See "LHDC Special Applications Data Sheet" for Ruggedised / Braided Over-sheathing
Data.
Two of the most commonly employed (standard) types are defined in the
following table :-
|
LHDC
TYPE
PART NO. |
ALARM
TEMPERATURE |
MAXIMUM
AMBIENT |
SIZE
- OVAL
MIN / MAX |
SHEATH
MATERIAL |
SHEATH
COLOUR |
CORE
IDENT
COLOURS |
|
700-070
|
70
C
|
45
C
|
3.5
- 4.5 mm
|
NYLON
|
BLACK
|
ORANGE/BLUE
|
|
700-090
|
90
C
|
70
C
|
3.5
- 4.5 mm
|
NYLON
|
BLACK
|
RED/WHITE
|
PATOL ANALOGUE L.H.D.C.
