Kidde AlarmLine LHD4 Linear Heat Detector

Code: LHD4
  • Short Circuit Discrimination
  • Field adjustable alarm set point
  • Intrinsically safe option

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Now obsolete, replacement controller here. If the cable needs changing too, please contact us; an alternative controller will be required to work with the latest cable.

The Kidde LHD4 AlarmLine Linear Heat Detector is a two-component heat detection system. Comprising of the LHD4 interface module and heat sensor cable. The cable senses a change in temperature, which provides a decrease in resistance exponential, which the interface module computes and provides an output to the control panel if the user predetermined alarm set point has been exceeded.

Ideal for deployment where point smoke or heat detectors are not permitted. Suitable for use in confined spaces or hard to access areas or hazardous areas, with intrinsically safe options available. Installation is easy; detector cable can surround the protected area or be placed around machinery. Alarmline cable is supplied in standard PVC, Nylon coated PVC or Bronze Braided PVC.

If a fire or overheating occurs, the Alarmline cable can be restored up to temperatures of 257°F (125°C). Higher temperatures will warrant replacement.

False alarm protection is built-in; the system will output a trouble condition in the event of an electrical fault or short circuit.

Examples of deployment are; open areas, cable trays, storage racks, freezer warehouses, fuel tanks, cooling towers, waste fuel drum storage, escalators and power distribution.


  • Localised installation at the point of risk
  • Pairs with most central control panels
  • The alarm setpoint can be programmed by the user and can be adjusted
  • Durable, selection of cable options for applications
  • Reliability; false alarm protection, reusable cable after an event (analogue only)

Order Information

Alarmline Analogue Sensor Cables & Control Units

K82017 Alarmline Analogue sensor cable – Standard blue
K82021 Alarmline Analogue sensor cable – Nylon coated
K82078 Alarmline Analogue sensor cable – Bronze braided
K98166 Alarmline Analogue sensor cable – Stainless steel braid over nylon
53836-K254 LHD4 Control unit – Conventional
53836-K255 LHD4 Control unit c/w relay outputs
53836-K256 LHD4 Control unit c/w relay outputs (FM approved)

Alarmline Digital Sensor Cables

D5387-368 Alarmline Digital sensor cable H8040N
D5837-385 Alarmline Digital sensor cable H8045N
D5837-105 Alarmline Digital sensor cable H8028
D5387-174 Alarmline Digital sensor cable H8069
D5387-227 Alarmline Digital sensor cable H9650

Alarmline Accessories

K82023 End of line termination kit
K82024 In-Line jointing kit
B6782-070 Intrinsically safe zener barrier (MTL7761ac)
23911-K055 Dual Channel Galvanic Isolator (MTL5061)
23900-K227 DIN Rail interface enclosure – 4 interfaces
23900-K228 DIN Rail interface enclosure – 10 interfaces
B6782-002 Cable collector, stainless steel
B6782-036 Retractable cable – 10m
B6782-037 Retractable cable – 11m
B6782-038 Retractable cable – 12m
B6782-039 Retractable cable – 13m
B6782-040 Retractable cable – 14m
B6782-030 Retractable cable – 15m
B6782-041 Retractable cable – 16m
B6782-042 Retractable cable – 17m
B6782-043 Retractable cable – 18m
B6782-044 Retractable cable – 19m
B6782-045 Retractable cable – 20m
B6782-046 Retractable cable – 21m
B6782-047 Retractable cable – 22m
B6782-048 Retractable cable – 23m
B6782-049 Retractable cable – 24m
B6782-050 Retractable cable – 25m
B6782-170 Retractable cable – 30m
53836-K241EX Automatic cable reeler – Stainless Steel c/w Ex Polycarbonate junction box
53836-K247EX Automatic cable reeler – Stainless Steel c/w Ex Stainless Steel junction box
B6782-189 Ex Junction box c/w 2 cable glands
B6782-190 Ex Junction box c/w 3 cable glands

Alarmline Analogue and Digital Sensor Cable Fixings

B6782-024 Edge Clip, 3-8mm Web
B6782-025 Edge Clip, 8-14mm Web
B6782-026 Edge Clip, 14-20mm Web
B6782-195 Edge Clip, 2 – 3mm Web Stainless steel
B6782-004 ‘T’ clip:
B6782-005 Pipe clip
B6782-023 ‘V’ clip
B6782-154 “L” Bracket c/w strain relief bush
B6782-142 Channel bracket
B6782-194 L Bracket
27400-K244 P Clip
27400-K245 Tie wrap and cradle
B6782-120 200mm Distance piece
B6782-008 Neoprene sleeve
B6782-121 Cable tie
35100-K253 M6 HEX full nut stainless steel
35100-K254 M6 x 16 Hex bolt stainless steel
21176-K007 M6 flat washer stainless steel
21176-K008 M6 spring washer stainless steel

Other Part Numbers

73-117068-013 Standard PVC Sensor Cable 656 feet (200 meters) Roll
73-117068-113 Standard PVC Sensor Cable 3,280 feet (1,000 meters) Roll
73-117068-016 Nylon Coated Sensor Cable 656 feet (200 meters) Roll
73-117068-116 Nylon Coated Sensor Cable 3,280 feet (1,000 meters) Roll
73-117068-019 Bronze Braided Sensor Cable 656 feet (200 meters) Roll
73-117068-119 Bronze Braided Sensor Cable 3,280 feet (1,000 meters) Roll
73-117068-047 4-Wire Interface Module with Relay Output and surface Mount Enclosure
73-117068-020 Nylon Cable Tie (pkg 100) for pipe up to 8″
73-117068-022 Master Clamp (pkg 100) for flanges to 1/2″
73-117068-023 Flange Clip (pkg 100) for flanges to 3/16″
73-117068-024 Flange Clip (pkg 100) for flanges to 1/4″”
73-117068-025 Nylon Cable Clamp (pkg 100) for use with Master Clamp or Flange Clips or Nylon Cable Tie
73-117068-026 Weathertight Connector, used with Standard Sensor
73-117068-027 Weathertight Connector, used with Nylon Coated or Bronze Braided Sensor
73-117068-028 In-Line Sensor Splice (pkg 10) – 4 required per splice
73-117068-029 In-Line Sensor Splice Crimping Tool
73-117068-030 Sensor Termination Kit (pkg 10) – terminates 10 zones
73-117068-031 Intrinsic Safety Barrier (2 required per zone)
73-117068-032 Intrinsic Safety Barrier Weathertight Enclosure holds (2) Barriers
73-117068-033 Intrinsic Safety Barrier Weathertight Enclosure holds up to (5) Barriers
73-117068-034 Intrinsic Safety Barrier Weathertight Enclosure holds up to (12) Barriers
73-117068-035 Intrinsic Safety Barrier Weathertight Enclosure holds up to (24) Barriers

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Title Size
Kidde AlarmLine 967 KB

Additional information

Weight 0.09 kg