Digital Linear Temperature Sensing

Provides “point of risk” …not the most convenient roof /ceiling height…. or “area detection” of overheat or incipient fire conditions within ALL environments….including dirty, dusty, damp and corrosive. No minimum length exposure is required in order to generate an alarm condition at a pre-determined temperature level! The combined cable and continuous detector monitors and detects adverse temperature rises at any and all points along its installed length…it’s not more sensitive at specific points!

  • FREE from RFI and /or EMI Interference
  • On site post installation direct flame testing possible without need to replace installed linear sensor cable
  • Most Economic U.K. / USA / EUROPEAN  manufactured range of linear sensor cables. Not poorer quality non European manufacture. 

Proline “TH” digital linear temperature sensing cable is manufactured as 2 twisted and tensioned tin plated copper coated steel conductors, each covered by a temperature sensitive polymer. At its rated temperature, the insulation breaks down allowing the conductors to come together to produce an alarm signal. In the event of mechanical damage at temperatures below its alarm threshold the conductors extrusion is maintained resulting in an open circuit fault /trouble signal being generated. An outer extrusion of colour coded polymer is applied around the two insulated conductors to provide a 3.5 mm external diameter linear sensing cable. For particularly high corrosive or abrasive environments a RILSAN protective extrusion may also be incorporated. Its ability to operate without adversely affecting response times / operating sensitivity has been positively tested by Underwriters Laboratories (U.L.).
Proline provides Conformity with EN54-28……..The ONLY Global standard dedicated to linear detection


  • Low Cost and Fast Response
  • FM Approved AND UL listed
  • Conforms with EN54-28
  • User Friendly- with all central alarm control panels
  • Overheat Detection = Fire PREVENTION
  • Incipient Fire Detection
  • Continuous Monitoring -100% sensor cable length
  • Not affected by RFI or EMC
  • Installed length not restricted by high ambient temperatures
  • ATEX certified zener barrier use in hazardous areas
  • Continuous operation within -40C / - 40F to + 125C /+257F
  • Section Replacement after an alarm – not total length
  • On site In service alarm testing possible
  • Maintenance Free
  • Optional Interface unit Range provides……….. Colour coded LCD DISPLAY Alarm Point location feature Volt free contact outputs – alarm & fault /trouble Multi - channel detection in a single enclosure Pre-Alarm Signalling Continued detection when in fault mode Remote alarm signalling – SMS to specified cell phones

"TH" SENSOR CABLE – Technical Specification

External Diameter 3.5 mms (0.138 in)
Dielectric Withstand 500Vdc – UL tested
 Conductors Tin Plated Copper Covered Steel
Electrical Rating 30Vac (42.4Vdc) 10A
Conductor Resistance 92.1 ohms Maximum per 1,000 m
Conductor Extrusion Temperature Sensitive Polymer
External Sheath Colour Coded Polymer Lead & Cadmium free / UV resistant
Tensile Strength 1,700min: (N/mm2) to BS EN 60811-1
Optional Coverings RILSAN corrosion & Abrasion resistant or 316 Stainless Steel
Messenger Wire Nylon covered S/S 1.05mm (0.04in)
Capacitance TH68: 150pF/m, TH88: 97pF/m, TH105: 88pF/m
Inductance TH68: 960n H /m, TH88: 540n H/m TH105: 1060n H/m
Impedance TH68: 80 ohms, TH88: 75 ohms, TH105: 110 ohms
Minimum Bend Radius 100 mms (4.0 in)
Shipping Weight 27 kgs (60 lbs)
Alarm Rating
68C /155F
88C /190F
105C /221F
185C /365F
Approvals Max: Spacing
FM, UL, ULC 10.67 m (35 ft)
FM, UL, ULC 10.67 m (35 ft)
FM, UL, ULC 10.67 m (35 ft)
UL, ULC 10.67 m (35 ft)


Digital (LHS) & Analogue Linear Sensing

The means to locally monitor for temperature changes (rise or fall) at "point of risk" and at ANY /ALL locations along an installed length of temperature sensitive cable - regardless of environmental conditions.

Fibre Optic Linear Temperature Sensing

Line detection of temperature change and rate of rise along multi -kms lengths of small diameter fibre optic cable. It provides high performance near real time temperature Sensing and Alarm functionality with standard communication interfaces.

Proline 'Nero' Water & Moisture Detection

Rapid detection of the smallest of leaks within Industrial, Commercial Environments by a recoverable cable. Designed to provide 24 hours/day x 7 days/week continuous monitoring of areas where even the smallest of leaks can prove disastrous. Essential where undetected leakages can cause serious damage to today’s complex electrical, communications and computer networks.



A U.K. registered Company with hands-on product development, global market & application experience dating from the 1970's.

Proline equipment conforms to all NFPA 72 and EN54 standards requirements for linear detection.

Pneumatic, Digital, Analogue, Fibre Optics, Measuring Point System, Aspirating Systems...regardless of your linear detection requirement PROLINE will be happy to assist you.