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High Temperature Metal Sheathed Thermocouples (Type 27)

High Temperature Thermocouple with 316 Stainless Steel Head

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 4170°F. The combination of conductor, insulation material and sheath must be carefully selected to suit your process environment, service temperature and installation requirements (ie. whether the probe is flexible or not). Our experienced sales team are on hand to assist where required so please contact us if help is required.
  • Typically used with high temperature thermocouple types R, S, B, C and D
  • Temperatures up to 3990°F (continuous) or 4170°F (short term)
  • Semi-Rigid (mineral insulated) and Rigid (tube) styles available
  • Terminated in a 316 Stainless Steel standard terminal head
  • Calibration service for oxidizing and inert environments up to 3970°F

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 1470°F in oxidising atmospheres. Do not use in sulphur bearing atmospheres above 1020°F.
Semi-Rigid MgO R, S and B 0.040”, 0.062”, 0.125”, 0.188” and 0.250” 2140°F
600T Inconel 600® As above. Do not bend. Rigid Al2O3 R, S and B 0.125”, 0.188” and 0.250” 2140°F
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 0.040” and 0.062” 2820°F
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 0.040”, 0.062” and 0.125” 3990°F
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 0.062” and 0.125” 3990°F
MOL Molybdenum Suitable for use in inert, vacuum and reducing environments.
Do not bend.
Rigid MgO, Al2O3, HfO2 R, S, B, C and D 0.062”, 0.125”, 0.188” and 0.250” 3630°F
CMOL Coated Molybdenum Suitable for use in inert and oxidizing environments.
Do not bend.
Rigid MgO, Al2O3, HfO2 C and D 0.062”, 0.125” and 0.250” 2910°F

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1 Thermocouple Type Temperature Range (continuous) Temperature Range
(short term)
R Platinum - 13% Rhodium vs
Platinum
32 to +2820°F -60 to +3180°F
S Platinum - 10% Rhodium vs
Platinum
32 to +2910°F -60 to +3090°F
B Platinum - 30% Rhodium vs
Platinum 6% Rhodium
212 to +2910°F 212 to +3310°F
C Tungsten - 5% Rhenium vs
Tungsten - 26% Rhenium
120 to +3330°F 68 to +4170°F
D Tungsten - 3% Rhenium vs
Tungsten - 25% Rhenium
120 to +3330°F 68 to +4170°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
2 Insulation Material Comments Max.
Temperature
MGO

Magnesium Oxide
MgO

Very hygroscopic. Used mostly in compacted sheaths. 3090°F
ALO Aluminium Oxide
Al2O3
Excellent with Platinum alloys. 2820°F
HFO Hafnium Oxide
HfO3
Comparible to Berylium Oxide and safe to handle. 3990°F
* 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