THERMOCOAX Heating elements

Resistance heating is one of the first applications of electricity..

In the course of a century, thousands of heating problems have been solved ranging from megawatts down to a few watts, or less.

The fundamentals are always the same, the requirements and solutions widely different.

Between a large furnace constructed as an individual unit and a domestic heater produced in large quantities, there exist a number of cases where no “ready-made” solution is available.

For such cases, THERMOCOAX often presents a suitable answer to:

• Heating from the cryogenic temperatures up to
  >1000°C.

• Heat dissipation either very low or very high power (from few watts to several tens of kilowatts).

• For use in air, under vacuum or high pressure and in any corrosive environment compatible with the sheath material.

• In applications requiring high reliability components.

Easy fitting

Electrical screening

• THERMOCOAX heaters can be attached directly to metal parts

Tight bending radius

• Only 3 times the outer diameter

Small dimensions

• The heat can be generated exactly where it is required thus power losses are reduced as well as power consumption

Excellent heat exchange

• The heater can be brazed onto any metal piece

More information about Heating Elements:
Download data sheets

Single core heating elements

• Standard range

• Without cold ends

• With cold ends

• With true cold ends

• Self-regulated

• With coiled core

Twin core heating elements

• Without cold end

Immersion heater

• Ceramic protected immersion heater

   

Others

• Connectors

• Accessories

Temperature sensors

The measurement of temperature is a very important element in many parts of research and industry.

A well-known and proven method in temperature measurement is the use of thermocouples.

Accurate and fast measurements, easy mounting, simple utilisation and interchangeability as well as low-cost production are the reasons for the widespread applications of the thermocouples.

They are resistant to heat and pressure and relatively insensitive to parasites.

Specific technical requirements like within nuclear reactors, in space research or in medical fields led to the development of sheathed thermocouples of small dimensions, high insulation resistance and high resistance to aggressive media.

All this is being fulfilled by miniature sheathed thermocouples.

THERMOCOAX offers the best possible solutions to temperature measurement. Many sensors are standard off-the-shelf designs, but many others are especially designed and manufactured to customer requirements, within a wide range of specifications or even developed in partnership with our customers.

• Small overall dimensions and high flexibility enable temperature measurement in locations with poor accessibility.

• High mechanical strength.

• Protection of the thermoelectric wires against oxidation, corrosion and chemical pollution.

Accurate measurement

• Short response time: as an example, the intrinsic response time of a 0.25 OD mm THERMOCOAX thermocouple is 7 ms, the actual response in high velocity air is then 0.1 s. This very fast response time allows measurement of very short temperature variations.

  Easy fitting

• The continuous metallic sheath ensures a mechanical and chemical protection of the couple and THERMOCOAX thermocouples can be attached directly to metal parts

  Tight bending radius

• Only 3 times the outer diameter

  Small dimensions

• Down to 0.25 mm OD, the THERMOCOAX thermocouples can be inserted in any tiny equipment

  More information about Thermocouples: Download data sheet

  • Type K: Ni-Cr (+) / Ni-Al (-)

  • Type N: NiCrSi (+) / NiSi (-)

  • Type J:Iron (+) -/ Constantan® (-)

  • Type E: Ni Cr (+) /  Constantan® (-)

  • Type T: Copper (+) / Constantan® (-)

  • High temperature thermocouples

  Type S: Pt 10 % Rh (+) / Pt (-)
  Type R: Pt 30 % Rh (+) / Pt (-)
  Type B: Pt 30 % Rh (+) / Pt Rh (-)

  • The tungsten-rhenium thermocouples

  Type C (rigid or flexible):
  Tungsten-rhenium 5 % Re (+) -
  Tungsten-rhenium 26 % Re (-)

  Other thermocouples

  • Standard off-the-shelf thermocouple range

  • Stick-on thermocouples

   

ATEX Temperature sensors

The thermocoupes and RTDs range covers Ex Zones 0 to 2 and 20 to 22.

• Zones 0 and 1: intrinsic safety - marking "EEx ia" in accordance with EN 50020.

• Zone 2: Energy Limited Circuit - marking "EEx nL" in accordance with en 50021

The same technical properties as for thestandard thermocouple rangeapply for these sensors. Only the fitting and some used components are adapted to the ATEX requirements. Technical details are available in the document SE900R009

ATEX heating

The Relevant Protection Principle for THERMOCOAX heaters are:

• Zone 1 and 2: flameproof enclosure marking "EEX d" in accordance with EN 50018.

  The heaters properties are those of the standard range. Details are given inthe heating product range.

  ATEX Questionnaire

  As for any product intended for potentially explosive atmospheres, a dedicated questionnaire has to be filled out prior order execution.

  Please download the form:ATEX questionnaire.pdfand fill it out directly. Once completed, print it, add your company stamp and signature and post it to our sales department.

Mineral Insulated
Signal Transmission Cables

Thanks to their exceptional properties, THERMOCOAX cables can:

Be used in the most aggressive media:

• high pressure, vacuum, corrosive liquids or gases, vibrations, nuclear

  Withstand very high insulation resistance:

• over  to 10¹³Ohms

  Resist to very high temperatures

• work up to 1200°C

  Carry relatively high currents

• as well as very low signals at high frequency

  Be welded

• or brazed onto any piece or to pass through a wall.

   

  Dedicated applications for

• Nuclear energy
• Aeronautics, Defence and Space
• Cryogenic processes
• Chemistry and petrochemistry
• Vacuum technology
• Hydraulic systems
• Steam and gas turbines
• Robotics

• Single conductor

• Multi conductors

• Low capacitance for hyperfrequency signals

• Coaxial and triaxial for high frequency

The COFRAC calibration

THERMOCOAX metrology department is accredited by the COFRAC Calibration Section under the registration number 2.1384 referring to calibration at fixed points of the thermoelectrical couples.

Oven 2000°C                     Thermal cycling

Controls and tests

Systematic controls guarantee the quality of the THERMOCOAX products :

• X-ray of the hot junction,
• sheath integrity test,
• metallographic test on sample,
• calibration with appropriate thermal treatment
• dimensional
• electromotive forces (ITS90).
• certificate of compliance on request

Specific sensors

High temperature Capacitive Sensors TURBOCOAX

The TURBOCOAX capacitive sensors were developed to measure the clearance between the tip of the turbine blades and the casing of turbo engines.

• Non-contact blade tip clearance measurement
• No cooling system required
• Small dimensions
• Withstand temperatures up to 1,400°C  

  Other applications:

• Speed and/or counting measurements,
• Level or thickness, vibrations

  NEGACOAX® overheating and fire detectors

  The linear sensors NEGACOAX, to detect overheating and fires, are all constructed employing the mineral insulated cable technology.

  Applications:

  Chemical and petrochemical industries

• temperature control and survey of processes

  Aerospace industries

• jet engine and structure

  Space industries

• rocket thrust, detection of leaking hot gas

  and any other industry where the safety aspect is a key factor.

  Traffic control with VIBRACOAX® Weigh-In Motion sensors

  When used with appropriate instrumentation, VIBRACOAX can provide a wide range of information including:

• Weigh-in-Motion(WIM)
• Vehicle classification
• Axle counting and distances between axles
• Gross vehicule and load distribution
• Speed measurement
• Traffic volume

  THERMOCOAX manufactures the VIBRACOAX piezoelectric axle sensor since the mid 1970s. The sensor is used in data collection applications. The sensor is highly accurate and reliable with tremendous longevity and generally outlives the pavement in which it is installed.

  NEUTROCOAX® neutron detectors by SPND

  The NEUTROCOAX SPND is a neutron absorber material called emitter, insulated from the sheath or collector by alumina or magnesia insulator in a coaxial geometry.

  The SPND is connected to an amplifier by a single lead or twin lead THERMOCOAX coaxial cable capable of correcting the spurious current due to the irradiation of the cable.

  The THERMOCOAX SPND can be used in all types of reactors for in-core measurement of thermal neutron flux for:

• good knowledge of the neutron flux distribution
• monitoring the energy conversion in the reactors
• a better control of the safety criteria.

  Applications:

• accurate monitoring of thermal neutron flux,
• in irradiation experiments or instrumentation