Whilst TUNNELS (road / rail) themselves may only present owners and operators with a nominal risk of fire, a much greater risk comes from items which pass through the tunnel. A typical example of this being the recent fire (January 2015) within the Channel Tunnel where smoke from a vehicle fire onboard a train located approximately 33% of the way between the UK and FRANCE - and deep beneath the English Channel -  created a situation whereby all travel  through the tunnel was temporarily suspended and a grave risk to human life and capital investment was highlighted!!  We were also reminded of the limited escape options available to those trapped beneath ground in a tunnel as a result of a fire occuring. 

Many personnel consider specification of a very expensive and proven  unreliable detection concept who's  limited experience has resulted in a number of failures to detect an adverse tunnel condition or the system has generated false alarms .....FIBRE OPTICS LINEAR DETECTION. In many cases the false alarms have been the result of either accidently induced sharp bends in the fibre cable during  installation - which has prevented uninterrupted performance of the laser light within the cable during non alarm conditions - or from nominal levels of local vibration. Another condition which can adversely affect the laser light under non alarm conditions.  PROLINE F.M. approved, UL /cUL listed, NFPA72 & EN54-28 linear detection  dedicated standard conformity type TH  "digital" linear detection provides a more economic and reliable solution to rapid detection of overheat or incipent fire conditions by continuously monitoring for abnormal temperature conditions at point of risk along the entire length of the installed sensor cable. Whilst Proline may recommend a minimum bend radius for the sensor cable, the potential for false alarm signals  from anyone not adhering to manufacturer recommendations is not as harsh for Proline as it is for a fibre optics linear detection system. The Proline linear sensor is NOT affected by RFI or EMI /EMC , is classified as a "simple electrical apparatus" because of its extremely low monitoring current ( milli-amps) and when used together with a Proline supplied ZI interface unit, can provide indication of the location of the alarm condition along an associated length of TH sensor cable of up to 10,000 metres in length!!!  Full in situ site testing is also possible without having to repair or replace the linear sensor cable. Additionally, the ZI interface unit can be conveniently located within a security office or control room  with interconnecting cable installed between the risk area installed sensor cable and "remote" interface. Maximum length of interconnecting cable can be in excess of 2,000 metres!!

For full details and competitive pricing contact 



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.