1. Linear Heat Detection

2. Temperature Related Risk Protection
Data supplied by fire insurance companies indicates that most industrial fires are caused by
- Friction heat & sparks - Overheating of equipment
- Spontaneous combustion - Oil & oil fired equipment

3. What is Linear Heat Detection?
Continuous heat detector in the form of a cable - Alarmline Analogue: averaging heat detector - Alarmline Digital: fixed temperature heat detector

4. Analogue LHD Cable Definition:
- Multi-conductor cable containing insulators whose resistance varies proportionately to changes in temperature
- Re-settable provided temperature does not exceed burn-off point of PVC coating
- Alarm level adjusted via controller

5. Alarmline Analogue LHD Cables
High resistance - standard applications
Nylon extruded - chemical resistance
Bronze braided - increased mechanical protection over standard blue
Stainless Steel braided over nylon extrusion - offshore applications

6. LHD 4 Controller
K82012
K82194

7. LHD 4 Controller Features - Alarm level adjusted via moveable link
- Open circuit and closed circuit fault monitoring
- Fire and fault output to conventional fire alarm panels
- Volt-free relay option for analogue addressable fire alarm panels
- Eurocard 19” rack option

8. Alarmline Nomogram - Mark the Max Temperature
- Select the sensor cable length being used (D)100m
- Mark the Max Temperature
where an alarm must not be
given (B) 45 degrees
- Draw a line from point on “D” through point on “B” to the switch setting line (A). This is the switch setting that will not give a false alarm at the Max ambient temperature

9. Alarmline Nomogram
-In the event of a hot spot occuring, it can be shown how hot this would need to be to give an alarm for a given length
- 10 metre length = 83 degrees
- 1 metre length =120 degrees

10. Digital LHD Cable Definition:
- A cable which contains an insulator which melts at a specific temperature
- Switch output provided once alarm temperature reached
- Not re-settable

11. Alarmline Digital LHD Cables
Polythene braid 70º C
Nylon over sheath 70º C
Polythene braid 90º C
Nylon over sheath 90º C
PVC 113º C
PVC 180º C
Fluoropolymer 238º C

12. Alarmline Digital Control Units
Firebeta 2 to 12 zone conventional panel with optional extinguishant release module
Any other conventional fire alarm panel and/or extinguishant release module (retrofit)

13. Alarmline LHD - Advantages
Flexible
- Mechanically
- Electrically
Durable
- Wide range of casings / braiding
- Operating range -65º to +200º C
- Unaffected by operating environment

14. Analogue & Digital Properties
Alarmline Analogue
Alarmline Digital
Analogue
Recoverable
Open & short circuit fault detection
Min Operating Temp -65° C
Min Alarm Temp 35° C
Max Alarm Temp 105° C
Max recoverable Alarm Temp 150° C
Max length 1000m
Digital
Non-recoverable
Open circuit fault detection
Min Alarm temp 61° C
Max Alarm Temp 238° C
N/A
Max length 10,000m

15. Sensor Clips Edge clip ‘V’ Clip Sensor cable Sensor Neoprene
Neoprene sleeve
Cable tie
‘V’ Clip
Sensor
cable
Neoprene
sleeve

16. Applications Heavy industry Warehousing / storage tanks
Conveyors and escalators
Cable trays
Floor & ceiling voids
Tunnels
Car parks

17. Applications - Case Study 1
Electricity generation
- Cable trays and risers
- Boiler fronts
- Conveyors
- Cooling towers
- Transformers

18. Applications - Case Study 2
Warehousing and bulk storage
- Alarmline Digital cable with conventional control unit or
- Alarmline Analogue high resistance / Nylon extruded cable with LHD 4 controller
- Fixing clips as required
- “T” Clips
- Edge connectors
- Cable tray fixings

19. Racking
Sensor Cable

20. Trays
Traywork width 600mm maximum
Sensor
cable
Power
cables
supports

21. Applications - Case Study 3
Conveyors and escalators
- Alarmline Analogue bronze braided cable
- Sensor Pads Bronze Braided
- Series 4 LHD Control Unit
- Alarmline Digital Cable
- Conventional control unit
- Clips & Brackets to match site requirements

22. Conveyor
Heat
sensing
cable
Idle rollers
Conveyor Belt
Conveyor return

23. Escalators
Sensor Pad
LHD Bronze Braided sensor cable

24. International Approvals
Alarmline (Analogue)
Alarmline (Digital)
UK power generation
P 11
- EPA 022/215
Factory Mutual
- OB 9A2.AY
- OR 5A4.AY
Chinese Fire Officers
- MAAL 96652
Chinese Power Generation
- NSTCFEPQ (Appr) 92005
German VdS (1995)
UK power Generation
- EPA
- EPA 206/220
- OD 6A9.AY

25. LHD - Competition Digital systems - Protectowire Analogue systems
- Firesense
Fibre optic systems
- York Sensors
- Siemens

26. LHD 5 Trend Control Unit

27. Features Continuous monitoring of Analogue Linear Sensor cable
Detection of changes in ambient temperature & local hot spots
Auto recognition of ambient temperature
Auto recognition of cable length
Fully site programmable
3 programmable alarm levels
History buffer and event log storage

28. Cable requirements Bronze braided sensor
Stainless steel braided sensor
Note: Minimum length per unit 100 metres
Maximum length per unit 1000 metres

29. Specification Dimensions: 280 x 188 x 120 Weight: 2 Kg
Enclosure: Mild steel, IP30
Current consumption: Quiescent 110mA
Maximum 200mA
Relays: 2A at 30v dc
1A at 120VAC

30. Installation Four 6mm mounting holes
20mm knockouts for external cabling
Terminal connections for external wiring
Note: Power supplies and relay circuits should use screened cable approved by the current British Standard for “prolonged operation in fire”

31. Applications Cable tunnels Road/Rail tunnels Warehousing
Petrochemical Installations
Car Parks

32. Hot zone temperature V Hot zone length
100.0%
90.0%
80.0%
70.0%
Line 1 (Max Sensitivity)
Line 2
60.0%
Hot Zone Length (% of cable length)
Line 3
Line 4
50.0%
40.0%
30.0%
20.0%
10.0%
0.0% 10 20 30 40 50 60
Hot Zone Temperature above ambient (C)