Thermocouples

D&N have been manufacturing high quality Thermocouples in Newcastle since 1980 and specialise in customised solutions for the power, mining and smelting industries. We will happily match your current design and are able to work from diagrams, photographs or samples.

MINERAL INSULATED THERMOCOUPLES

Thermocouple with head and fittingThe Mineral Insulated Metal Sheath Thermocouple (MIMS Thermocouple) has become the accepted norm within most industries. It features a variety of temperatures and corrosion resistant sheaths with long lasting operational usage. Thermocouples are used internationally as the cheapest and the most interchangeable temperature sensor available, with a universal connection system they can measure a wide range of temperatures. The Thermocouple is widely used in harsh environments as configurations allow for thick walls and explosion proof heads. Thermocouples main limitation is that the accuracy of up to 1°C can occur and certain temperatures over a period of time. History Shows that an Estonian physician by the name of Thomas Seebeck discovered (Accidentally), that the junction between two different metals generates a small voltage which can be converted into a temperature coefficient. The Thermocouple measures the difference in temperature between two points, the active end or hot junction and the sensor junction cold end junction. This cold end junction is maintained at a constant temperature and is referenced with an RTD or Thermistor allowing a known cold end junction for calibration. There are many different types of metals that can be used that when placed together that produce a stable constant predictable voltage source. A list of the most common voltage sources is listed below.
As the choice of Thermocouple is varied a few factors need to be considered before ordering:

Compatibility

If you are replacing an existing Thermocouple probe, take into account the space allowed for the probe, the holes that are already in place and the connection lead types. It is also useful to note the model and type of the measuring equipment used what type of Thermocouple or RTD the meter reads.

Temperature Range

As shown below in the table and in appendix A the temperature range is critical when choosing a Thermocouple probe, as an incorrect probe may not operate correctly in that temperature zone but still may show a temperature, this may prove dangerous given the situation. We recommend that you add 10% to the hottest or lowest temperature of the equipment under test as this will allow for a safety margin.

Thermocouple Temperature Chart

 

Sheathing Material

The outer sheath of the Thermocouple or RTD will provide protection against heat allowing a longer lasting probe, chemical attack and abrasion resistance for further reference refer to Sheathing materials chart.

Thermocouple size sheath material Available 
sheathing material temperature range.
 

Overall Design

If planning a complete installation of temperature measuring equipment a range of factors needs to be taken into account:

Thermocouple Extension Cable

A Thermocouple extension cable must reflect the environment it is placed. ie .The temperature range and machinery that it passes through to get to the measuring instrument is it hot, cold, or abrasive. Will the cable be driven on or suspended over a given distance? For a selection of Extension, cables refer to the cable section.

Hot end junction

There a three ways the hot end can be configured each of these produces a different result for different applications.

Insulated Junction

Thermocouple Tips
Insulated Junction

Exposed Junctions

Thermocouple Tips
Exposed Junction

Bonded junctions

Thermocouple Tips
Bonded Junction

Tip Design

There are many methods that these junctions can be applied to a tip of a Thermocouple to increase it’s reliability and response time.

Standard rounded tip

Thermocouple Tips
Standard Round End Tip

Flat tip

Thermocouple Tips
Flat End Tip

Swage tip

Thermocouple Tips
Swage Tip

Extended welded tip

Thermocouple Tips
Extended Weld Tip

Thermocouple Sample
Thermocouple General Part Terms

 

Thermocouple styles available

ITEM

DESCRIPTION

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Thermocouple Drawing TA  THERMOCOUPLE STYLE  TA

M.I. Thermocouple Solid Tails

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Thermocouple Drawing TB  THERMOCOUPLE STYLE TB

M.I. Thermocouple Flex Tails

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Thermocouple Drawing TC  THERMOCOUPLE STYLE TC

M.I. Thermocouple Flex or Solid Tails BSP/ NPT fittings

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Thermocouple Drawing TD  THERMOCOUPLE STYLE TD

M.I Thermocouple Flex Tails, Polarised Plug or Jack

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Thermocouple Drawing TE  THERMOCOUPLE STYLE TE

M.I Thermocouple Polarised Plug or Jack

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Thermocouple Drawing TF  THERMOCOUPLE STYLE TF

M.I thermocouple Stellite coated Polarised Plug or Jack

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Thermocouple Drawing TG  THERMOCOUPLE STYLE TG

M.I thermocouple Extension cable With S/S Armour

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Thermocouple Drawing TH  THERMOCOUPLE STYLE TH

M.I thermocouple Spring Loaded Terminal Block

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Thermocouple Drawing  THERMOCOUPLE STYLE TI

M.I thermocouple Spring Loaded Hex nipples

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Thermocouple Drawing TJ  THERMOCOUPLE STYLE TJ

M.I thermocouple Surface Pad

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Thermocouple Drawing TK  THERMOCOUPLE STYLE TK

M.I thermocouple PROCESS FITTING

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Thermocouple Drawing TL  THERMOCOUPLE STYLE TL

M.I thermocouple Lug/washer all sizes

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Thermocouple Drawing TM  THERMOCOUPLE STYLE TM

M.I thermocouple bolt/threaded all sizes

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Thermocouple Drawing TN  THERMOCOUPLE STYLE TN

M.I thermocouple Magnetic surface probe

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 Thermocouple Drawing TO  THERMOCOUPLE STYLE TO

Thermocouple Surface probe Straight

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Thermocouple Drawing TP  THERMOCOUPLE STYLE TP

Thermocouple Surface probe Right angles

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Thermocouple Drawing TQ  THERMOCOUPLE STYLE TQ

M.I thermocouple Handheld probe Metal handle

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Thermocouple Drawing TR  THERMOCOUPLE STYLE TR

M.I thermocouple  MEAT STAB PROBE

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Thermocouple Drawing TS  THERMOCOUPLE STYLE TS

M.I thermocouple Small or Large head

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Thermocouple Drawing TT  THERMOCOUPLE STYLE TT

M.I thermocouple Small or Large head HEAVY DUTY THICK WALL

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Thermocouple Drawing TU  THERMOCOUPLE STYLE TU

M.I thermocouple Small or large head Holding tube Spring loaded

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Thermocouple Drawing TY  THERMOCOUPLE STYLE TV

M.I thermocouple PROCESS FITTING SPRING LOADED

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Thermocouple Drawing TN  THERMOCOUPLE STYLE TW

M.I thermocouple HOLDING TUBE PROCESS FITTINGS

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Thermocouple Drawing TX  THERMOCOUPLE STYLE TX

M.I thermocouple WITH FLANGE

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Thermocouple Drawing TY  THERMOCOUPLE STYLE TY

M.I thermocouple HOLDING TUBE & UNION

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Thermocouple Drawing TZ  THERMOCOUPLE STYLE TZ

M.I thermocouple Small or large head Ceramic sheath

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Thermocouple Drawing TAA  THERMOCOUPLE STYLE TAA

marshal tip thermocouple type k with holding handle

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 Thermocouple Drawing TAB  THERMOCOUPLE STYLE TAB

Thermocouple  Extension Cable Small Or Large Size Plugs or Jacks

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 Thermocouple Drawing TAC  THERMOCOUPLE STYLE TAC

Thermocouple Compensating Cable Junction all Options

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Thermocouple Plug MI 
Holding Support Thermocouple Plug 
Plug Support process Fitting.
Type K Thermocouple Plug MI 

 

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