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Protectowire Linear Temperature Detector is a patented detector cable that detects elevated temperature along its entire length. The probe cable comprises two twisted steel wires which are individually insulated with a temperature-sensitive polymer. The individually insulated conductors are intertwined and held together through their elasticity. The conductors are also wound in protective tape and an outer sheath, which is suitable for different environments in which the linear detector can be installed. Protectowire is a permanently installed digital sensor which, when it reaches its activation (nominal) temperature, signals an alarm. The temperature-sensitive polymer begins to wear off at nominal temperature due to internal stresses in the material, allowing the contact of internal conductive wires and consequently triggering the alarm.


Rooms and areas with extreme environmental conditions:

  • Cable trays
  • Switchgear
  • Pipelines
  • Transport systems
  • Storage/shelving
  • Oil fields
  • Devices for the distribution / storage of electrical energy
  • Storage
  • Road and rail transport of flammable liquids
  • Tunnels

Different types of cables

The portfolio of linear temperature detectors consists of four different types of cables. Each type contains a specific material, specially adapted outer sheath with selected features that suit different installation requirements.

The EPC durable vinyl outer sheath is fire resistant and is also resistant to the majority of chemicals, it does not absorb humidity and has excellent flexibility even at low temperatures. This type of cable is versatile and meets a wide range of commercial and industrial applications.

The XCR high-performance fluorine polymer sheath is designed for applications in which extreme environmental and product requirements must be complied with.

The XLT with a vinyl-polymer sheath is a special detector designed for use in cold storages and other applications where the alarm is triggered at very low temperatures. The line detector is UL and FM certified up to –51 °C.

The TRI-WIRE dual-range detector detects separately the preliminary alarm and then the alarm when each of the two nominal temperatures are reached. The outer sheath of the detector is made of vinyl.


Temperature of the alarm The maximum recommended ambient temperature The maximum allowed distance between cables Implementation of the cable/model
57°C 38°C UL 15,2 m, FM 9,1 m PHSC-1 35-XLT Linijski temperaturni javljalniki
68°C 46°C UL 15,2 m, FM 9,1 m PHSC-155-EPC
68°C 46°C UL 15,2 m, FM 9,1 m PHSC-155-XCR
68°C/93°C 38°C FM 4,6 m PHSC-6839-TRI
88°C 66°C UL 15,2 m, FM 9,1 m PHSC-190-EPC
88°C 66°C UL 15,2 m, FM 9,1 m PHSC-190-XCR
105°C 79°C FM 7,6 m PHSC-220-EPC
105°C 79°C FM 7,6 m PHSC-220-XCP
138°C 93°C UL15,2 m, FM 7,6 m PHSC-2B0-EPC
138°C 93°C UL15,2 m, FM 7,6 m PHSC-2B0-XCP
180°C 105°C UL15,2 m PHSC-356-EPC
180°C 105°C UL15,2 m PHSC-356-XCR



The RedGuard® system of temperature observation

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Allows an easy and secure way of observing temperature in hazardous areas. The design of the RedGuard system is simple. The system consists of a detection cable with built-in sensors and a processing unit. The processing unit captures and analyses temperature readings from 250 temperature sensors. Whenever the temperature exceeds the pre-set temperature values, the system reports an alarm and sends out other system data that the user set. The SSP/SRG processing unit reads the detector cable and converts the analogue values into temperature readings. The entire system is programmed with RGCC software, while TMON is the software used for visualization of the observed temperature profile on the computer. For each sensor four values can be pre-set. An additional four values can be arbitrarily set up along the whole length of the detector cable. Sensor values ​and operating states are processed in real time in the interfaces. All this enables for unusual situations and states to be recognised immediately and information about such occurrences to be adequately reported or used to trigger an alarm.




Detector cable

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It contains all the necessary electronics for measuring temperature, addressing and data transfer to the processing unit. A flat probe cable consists of eight conductors: two lines serve as a redundant grounding conductors, two lines are intended for power supply, two lines for data transfer, and two lines serve for addressing. The top layer of the cable consists of two protective sheaths. The internal thermoplastic elastomer is used as protection against humidity, the outer polyurethane or fluorine polymer protects against mechanical and chemical influences. The cable is available in two versions, namely: The SD is designed for a temperature range of –40 °C to 85 °C, and the HD version for a range of –55 °C to 125 °C.


The RedGuard system is useful in similar conditions as the Protectowire cable, while it also offers additional advantages. The location of the alarm can be accurately determined, and the temperature and the gradients can be set for each sensor separately. The RedGuard system is also useful for monitoring the temperature of industrial processes.

System design and connection

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It is the functional equivalent of the linear temperature detector system, but it uses the latest sensing technology with optical fibres. The system consists of a standard probe cable from the fiber-optic fibres and PTS controllers with the appropriate software. The PTS family of controllers can be programmed according to different alarm criteria and can be connected to a certified alarm central control panel via relay inputs and outputs. Locally, the position of the critical temperature is determined by measuring the reflection time of the light pulse, similar to what a radar does, where the echo defines the distance to a car or an air plane. This allows the controller to determine the exact location of elevated temperature or a fire along the entire length of the probe cable. The temperatures are recorded in the form of a continuous recorder. The whole system enables for a graphical representation of the fire and the direction in which the fire is spreading, which is based on the distance of the sensor in the alarm.


  • Special possibility of division into zones – the single length of a sensor can contain up to 256 areas (zones),
  • Numerous options of zonal criteria for triggering an alarm,
  • Adjustable user program logic,
  • The possibility of continuous temperature observation,
  • Graphical representation of the temperature profile, fire size and the direction in which it is spreading through a computer interface,
  • A LAN interface (TCP/IP) allows access from different locations.

Fibre-optic sensor cable

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The core of the probe cable is a stainless steel or a non-metallic material tube with an outer diameter of between 1.2 and 1.8 mm. Inside it are two independent, colour-coded, quartz optical fibres. Depending on the model the outer layer of the tube can be a braid made of stainless steel, or aramid fibres. The core of the sensor is covered on the outside with a fire-resistant and halogen admixtures free coating with a diameter of 4 mm.


The system is primarily intended for commercial and industrial applications with high risk that require high reliability and solutions tailored to users.


  • Power supply: 10 to 30V DC
  • Consumption: 15W (20 °C) on average, the maximum power consumption is less than 40W (in any operating conditions)
  • Temperature range of operation: 10 °C to 60 °C for two channel models: -5°C to 60°C
  • Temperature range of storage: 40°C to +80°C
  • Relative humidity: 0% to 95% non-condensing humidity 2-channel models 15% to 85%, non-condensing humidity
  • Housing: The PTS controller is installed into a NEMA 1 type red housing with the texture 51cm x 76cm x 18cm (W x H x D)
  • Interfaces: optical connector E2000, eight degrees number of channels: 1 or 2, depending on the model computer interface: USB, LAN relay card: 4 inputs/20 outputs