Catalogue CâblesCâbles de liaison pour instrumentation

Câbles de liaison pour instrumentation

The cables presented in this section are meant for making the connection between the RTD and the measuring device (resistance loop) or between the transmitter and the measuring device (mA) loop.
In both cases, the idea is to keep the resistance of the cable as small as possible to reduce the measurement error or to allow the transmitter to draw its maximum current in the case of 4-20 mA loops. Therefore, the cross section of the cable should be increased when the cable length increases.

The cables are usually manufactured according to IEC 751 (EN60751) standards, but can also be made according to ANSI, UL or other standards upon request.

Colour code according to IE C751:

  • Single temperature sensor: white/red
  • Dual temperature sensor: white/red (sensor 1) yellow/black (sensor 2)

Depending on the application and to suit particular environmental factors like temperature, humidity, physical integrity, the user can usually choose among several insulating materials.

  • PVC (code PVC – short code P)
    Polyvinyl Chloride is a thermoplastic resin with good resistance to water and aqueous saline solutions, acids and alkalis, moderate resistance to organic solvents and oils. PVC is a self extinguishing material. Generally usable between -30 and +105 °C.
  • Silicone rubber (code SIL – short code S)
    Silicon rubber insulate d cables show resistance to hot air up to 180-200°C. This material is not recommended for exposure to steam above 130°C. Do not use with alkalis, acids, liquid fuels, chlorinated hydrocarbons, esters, ketons and ethers, aromatic oils. Generally usable between -40 and +200 °C.
  • Glass braid
    Impregnated glass fibres type «E» (code TEX – short code E) usable to 400 °C.
  • Fluorinated resins
    These resins exhibit outstanding chemical inertia, dielectric properties and heat resistance. Most common types are PTFE (short code F), PFA (short code A) and MFA (short code M). While PTFE has the highest melting point, other perfluorinated resins like PFA and MFA exhibit similar chemical resistance with slightly lower melting points but have the advantage to be easily extruded.
    - PFA melts at 306 °C and can be used for continuous operation between -200 and +260 °C
    - MFA melts at 280 °C and can be used for continuous operation between -200 and +250 °C

Fire resistant cables: available upon request

Most common protections are:

  • Braids: tinned copper (short code CS), steel (short code TA) and stainless steel (short code TI)
  • Shields: aluminised polyester tape with drain wire (short code AL)
  • Steel armour (short code AC)
  • Cables with double braid or double shield (short code DX) can also be ordered upon request.

RTD and measuring cables are also identified with their cross-sectional area in mm2 (3-digit short codes) which also indicates that the conductors are made of strands of thin wires to keep the cable flexible.
In case that solid conductors are required, the diameter will be mentioned (short codes starting with D and diameter in tenths of mm ex: D13 for Ø1,3 mm)

Remark: more detailed data sheets can be obtained upon request.