Heavy Duty Thermocouple with Heavy Duty Cast Iron Head

Heavy Duty Industrial Metal Sheathed Thermocouples
Heavy Duty Thermocouple with Heavy Duty Cast Iron Head

  • Type 13 assemblies are available with thick wall protective sheaths in Stainless Steel, Inconel 600*, Incoloy 800*, Chromium Iron, Nicrotherm etc. as well as specialised sheath materials such as Hastelloy and Kanthal
  • Typical temperature measurement applications include: furnaces (blast, carburizing etc.), kilns, ovens, boilers, flues, cyanide/galvanising baths and general heat treatment applications
  • Alternatively, we have a large range of sensors available to buy online in various diameters and lengths
  • Calibration is available for our range of Heavy Duty Industrial Thermocouple assemblies
  • Suited to arduous temperature measurement up to 2280°F/1250°C
  • Depending on the sheath material selected, Type 13 assemblies are suitable for use in neutral, reducing or oxidising atmospheres and those with high concentrations of sulphurous gases
  • Available attachment fittings include adjustable flanges or welded bushes
  • See detailed information on how a thermocouple works

Heavy Duty Thermocouple Enquiry Form

1. Thermocouple Type
2. Number of Elements
3. Primary (metal) Sheath Diam.
4. Primary Sheath Material
5. Total Length below head
6. Secondary Sheath Material
7. Optional Tube Mounting

Illustration Select
Not Required
3/4" NPT Welded Fixed Position Screwed Bush
1" NPT Welded Fixed Position Screwed Bush
4" Adjustable
Cast Iron Flange
7a. Length below Tube Mounting to Tip

8. Optional 4 to 20mA Transmitter
9. Quantity Required

Contact Details

Company Name

Your Name



Additional Information

If your enquiry is for more than one style of sensor, please email us with your requirements or use the box below

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1 Thermocouple Type Temperature Range (continuous) Temperature Range
(short term)
K Nickel Chromium vs
Nickel Aluminium
32°F to +2010°F -290°F to +2460°F
J Iron vs Constantan +68°F to +1290°F -290°F to +1380°F
N Nicrosil vs Nisil 32°F to +2010°F -450°F to +2370°F
R Platinum - 13% Rhodium vs
32°F to +2820°F -60°F to +3180°F
S Platinum - 10% Rhodium vs
32°F to +2910°F -60°F to +3090°F
B Platinum - 30% Rhodium vs
Platinum 6% Rhodium
+212°F to +2910°F +212°F to +3310°F
C Tungsten - 5% Rhenium vs
Tungsten 26% Rhenium
+120°F to +3330°F +68°F to +4170°F
C Tungsten - 3% Rhenium vs
Tungsten 26% Rhenium
32°C to +3810°F 32°F to +4710°F
Temperature ranges refer to the thermocouple type.
The temperature range of the sensor may deviate from the above,
please refer to the product description for more details
3 Sheath Material Max.
Standard Sheath Materials

316L Stainless Steel
Very good corrosion resistance.
Wide range of applications

600 Inconel 600
Suitable for severely corrosive atmospheres.
Good resistance to oxidisation.
Do not use in sulphur bearing atmospheres.
800 Incoloy 800
Suitable for severely corrosive atmospheres.
Good resistance to oxidisation and carburisation.
Suitable for use in sulphur bearing atmospheres.
446 AISI 446
Suitable for severely corrosive atmospheres.
Suited for use in high concentration sulphur bearing atmospheres. at high temperatures.
Mount vertically above 700ºC.
Specialized Sheath Materials
114 Nicrotherm DTM
For high temperature Type K and almost all Type N applications.
Very good high temperature strength.
Excellent in oxidising, carburising, reducing and vacuum atmospheres.
Don not use in sulphur nearing atmospheres.
KAN Kanthal AF / Kanthal APM
Superior resistance to carburisation, thermal shock, sagging and distortion.
Excellent mechanical properties.
Kanthal AP for diams. up to 22mm. Kanthal APM for diams. above.
160 Haynes HR160
Outstanding resistance to high temperature corrosion.
Excellent resistance to sulphur and chloride attack.
Resistant to oxidation, hot corrosion, carburization, metal dusting, nitridation and corrosion attack.
601 Inconel 601
A nickel-chromium alloy with added aluminium for outstanding resistance to oxidation.
Highly resistant to carburization.
276 Hastelloy C276
Excellent corrosion resistance to both oxidising and reducing media.
Excellent resistance to sulphur compounds and cholride ions.
253 MA253
An austenitic chromium-nickel steel alloyed with nitrogen and rare earth metals.
High creep strength, very goodresistance to isothermal and cyclic oxidation.
6 Secondary Sheath
IAP Impervious Aluminous Porcelain
Suitable for base metal thermocouples.
Low temperature coefficient.
Suited to kiln applications.
Requires support at high temperatures if horizontal.
IM Impervious Mullite
For use with precious metal thermocouples
Great mechanical strength.
Relatively inert to suplhurous and carbonaceous atmospheres.
Often used as a secondary sheath with silicone carbide primary.
IRA Impervious Recrystallised Alumina
For use with precious metal thermocouples.
Fair thermal shcok resistance. High inertness to chemicals.
Ideal for reducing carbonaceous atmospheres.
High resistance to alkaline and other fluxes.
 When added protection to the conductors is required,
a secondary closed end ceramic sheath within the primary
metal protection sheath can be specified. This composite
protection sheath will encompass the twin or four bore
insulators and their associated thermocouple elements.

Hot junction insulated from sheath. Gives floating output with typical insulation resistance in excess of 100 megohms

Hot junction welded to sheath tip giving earthed output and faster response to temperature changes

Fastest response mainly for the measurement of air temperature in ducts. Restricted to a maximum operating temperature of 1110°F