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High Temperature Ceramic Sheathed Thermocouples

with IP67 heavy duty cast iron head

  • These assemblies are used for temperature measurement to 2920°F/1600°C plus in kilns, furnaces and flues etc
  • These assemblies are available as standard with primary and optional secondary ceramic protective sheaths in a range of diameters of; impervious aluminous porcelain, impervious recrystallised alumina, impervious mullite and silicon carbide
  • Alternatively, we have a large range of sensors available to buy online in various diameters and lengths
  • UKAS calibration is available for our range of Ceramic Sheathed Thermocouple assemblies
  • Assemblies in all the common high temperature thermocouple conductor combinations are available in both simplex or duplex styles
  • Available attachment fittings include adjustable flanges or welded bushes

Enquiry Form

1. Thermocouple Type

2. Number of Elements

3. Primary Sheath Material

4. Primary Sheath Diameter

5. Sheath 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

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
D 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
3/6 Standard 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.
SC Silicone Carbide
A Porous material with outstanding resistance to thermal shock.
Good mechanical strength.
Often used as a primary sheath material enclosing a secondary.
Unsuitable for highly oxidising atmospheres.
Primary Sheath
Metal Support Tube
8mm 21.3 x 100mm
Support Tube
10mm 21.3 x 100mm
Support Tube
12mm 21.3 x 100mm
Support Tube
17mm 26.7 x 100mm
Support Tube
20mm 26.7 x 100mm
Support Tube

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 570°F