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High Temperature Thermocouple with Die Cast Alloy Flip Top BUZ Head

High Temperature Metal Sheathed Thermocouples (Type 27)

These high temperature thermocouples are used in applications where other thermocouples would fail due to excessive heat or severe environments. Utilising specialist exotic sheath materials such as Platinum 10% Rhodium, Molybdenum and Tantalum they can be used in service temperatures up to 2300°C. The combination of conductor, insulation material and sheath must be carefully selected to suit your process environment, service temperature and installation requirements (i.e. whether the probe is flexible or not). Our experienced sales team are on hand to assist where needed, so please do not hesitate to contact us if help is required.
  • Typically used with high temperature thermocouple types R, S, B, C and D
  • Temperatures up to 2200°C (continuous use) or 2300°C (short term use)
  • Semi-Rigid (mineral insulated) and Rigid (tube) styles available
  • Terminated in a die cast alloy flip top terminal head
  • Calibration service for oxidizing and inert environments is available up to 1600°C

Code Sheath Material Operational Properties MI (Semi-Rigid)
Tube (Rigid)
Insulation Material Thermocouple Types Available Sheath Diameters (mm) Max.
Continuous Temperature
600

Inconel 600®

Suitable for use in inert, vacuum and oxidizing environments.
Minimum bend radius: 5 x sheath diameter.

Not recommended for use above 800°C in oxidising atmospheres. Do not use in sulphur bearing atmospheres above 550°C.
Semi-Rigid MgO R, S and B 1.0mm, 1.5mm, 3.0mm, 3.2mm, 4.8mm, 6.0mm and 6.4mm 1175°C
600T Inconel 600® As above. Do not bend. Rigid Al2O3 R, S and B 3.0mm, 3.2mm, 4.8mm, 6.0mm and 6.4mm 1175°C
P10R Platinum 10% Rhodium Suitable for use in inert and oxidizing environments.
Minimum bend radius: 10 x sheath diameter.
Semi-Rigid MgO R, S and B 1.0mm, 1.5mm and 1.6mm 1550°C
TAN Tantalum Suitable for use in inert and vacuum environments.
Minimum bend radius: 5 x sheath diameter.
Semi-Rigid MgO, Al2O3, HfO2 R, S, B, C and D 1.0mm, 1.5mm, 1.6mm, 3.0mm and 3.2mm 2200°C
NIO Niobium 1% Zirconium Suitable for use in inert and vacuum environments.
Minimum bend radius: 10 x sheath diameter.
Semi-Rigid MgO, Al2O3, HfO2 R, S, B, C and D 1.6mm and 3.2mm 2200°C
MOL Molybdenum Suitable for use in inert, vacuum and reducing environments.
Do not bend.
Rigid MgO, Al2O3, HfO2 R, S, B, C and D 1.5mm, 1.6mm, 3.0mm, 3.2mm, 4.8mm, 6.0mm
and 6.4mm
2000°C
CMOL Coated Molybdenum Suitable for use in inert and oxidizing environments.
Do not bend.
Rigid MgO, Al2O3, HfO2 C and D 1.5mm, 1.6mm, 3.0mm, 3.2mm and 6.4mm 1600°C

High Temperature Thermocouple Enquiry Form

1. Thermocouple Type
2. Sheath Material (see above)
3. Insulation Material
4. Sheath Diameter
5. Sheath Length

 mm
6. Types of Sensing Junction

Illustration Select
INSULATED Junction
GROUNDED Junction
Duplex Element Required? (please tick box)
7. Quantity Required

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1 Thermocouple Type Temperature Range (continuous) Temperature Range
(short term)
R Platinum - 13% Rhodium vs
Platinum
0°C to +1600°C -50 to +1750°C
S Platinum - 10% Rhodium vs
Platinum
0°C to +1550°C -50 to +1700°C
B Platinum - 30% Rhodium vs
Platinum 6% Rhodium
+100 to +1600°C +100 to +1820°C
C Tungsten - 5% Rhenium vs
Tungsten - 26% Rhenium
0 to +2200°C 0 to +2300°C
D Tungsten - 3% Rhenium vs
Tungsten - 25% Rhenium
0 to +2200°C 0 to +2300°C
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
2 Insulation Material Comments Max.
Temperature
MGO

Magnesium Oxide
MgO

Very hygroscopic. Used mostly in compacted sheaths. 1700°C
ALO Aluminium Oxide
Al2O3
Excellent with Platinum alloys. 1550°C
HFO Hafnium Oxide
HfO3
Comparible to Berylium Oxide and safe to handle. 2200°C
* Please refer to the Sheath Material table above for applicable diameters

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

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