AMS2750 Approved Thermocouples for Vacuum Furnaces

Vacuum Thermocouple with IP67 Die Cast Alloy Head

Ceramic Sheathed Vacuum Thermocouples
Type 40/41 assemblies incorporate an integral Spectite® seal and are ideal for vacuum furnace applications. The Spectite® vacuum seal is rated to 5 x 10-6 torr with low leak rates (better than or equal to 1 x 10-6 scc/sec. under 1 Atm @ 20ºC). These thermocouples can be supplied to all recognised standards and tolerances when combined with our UKAS calibration services. They are available in simplex and duplex junction styles with an optional test sensor hole for calibration / survey work. A wide range of support tube fittings for attachment into the process is available.
  • Vacuum seal rated 5 x 10-6 torr
  • Low leak rates
  • Integral Spectite® seal on internal wires maintains vacuum even if sheath is damaged
  • Wide operating temperature range up to 1600°C
  • Optional test sensor hole for calibration or system accuracy tests (SAT) without removal from process
  • Wide range of attachments for process installation
  • Simplex and Duplex versions available
  • UKAS and In-House calibration options available to all major international and industry specific standards
  • Flexible tagging options available for clear traceability
Calibration Accuracies:

Code Standard Accuracy Supplied Certification
IEC1 IEC 60584.2 Class 1 Types K/N: ±1.5ºC (-40 to +375ºC) or 0.4% (375 to 1000ºC)
Types R/S: ±1.0ºC (0 to 1100ºC) or 1ºC + 0.3% of temperature above 1100ºC (1100 to 1600ºC)
TC Ltd offer both UKAS and In-House (traceable to national standards) calibrations to all major international standards up to 1590°C. Our laboratory is fully accredited to ISO17025 and our reports are designed with the requested standard in mind. Our sales engineers are on hand to discuss any requirements so please do not hesitate to contact us for more details.
AMS1 AMS2750 Types K/N: ±1.1ºC or 0.4%
Types R/S: ±1.0ºC or 0.25%
(whichever is greater)
Type B: ±1.0ºC or 0.25%
(whichever is greater)
AMS2 AMS2750 ±2.2ºC or 0.75% of reading
(whichever is greater)
BAC2 BAC5621 ±1.1ºC <538ºC or
0.4% of reading >538ºC

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© 1998- TC Ltd., PO Box 130, Uxbridge, UB8 2YS, United Kingdom.
Tel.: 01895 252222, Fax: 01895 273540, Email:
© 1998- TC Ltd., PO Box 130, Uxbridge, UB8 2YS, United Kingdom.
Tel.: 01895252222, Fax: 01895 273540, Email:

1 Thermocouple Type Temperature Range (continuous) Temperature Range
(short term)
K Nickel Chromium vs
Nickel Aluminium
0°C to +1100°C -180°C to +1350°C
N Nicrosil vs Nisil 0°C to +1200°C -270°C to +1300°C
R Platinum - 13% Rhodium vs
0°C to +1600°C -50°C to +1750°C
S Platinum - 10% Rhodium vs
0°C to +1550°C -50°C to +1700°C
B Platinum - 30% Rhodium vs
Platinum 6% Rhodium
+100°C to +1600°C +100°C to +1820°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 Sheath Material Operational Properties Max.
IAP Impervious Aluminous Porcelain Ideally suited for use with base metal thermocouple conductor combinations. Has a very low temperature coefficient of expansion thus giving excellent resistance to thermal shock. Offers high strength and high resistance to flux and slag attack. Suited to kiln applications where low contamination requirements preclude the use of a metal sheath. NB. Requires support at high temperature if horizontal. 1400°C
IRA Impervious Recrystallised Alumina Ideally suited for use with precious metal thermocouples at high temperatures. Provides a fair resistance to thermal shock. High degree of inertness to chemicals. Ideal for reducing carbonaceous atmospheres and offers a high resistance to alkaline and other fluxes. 1600°C

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

Fastest response mainly for the measurement of air temperature in ducts. Restricted to a maximum operating temperature of 300ºC

3 Ceramic Sheath
Diameter 'd1'
Support Tube
Diameter 'd2'
  3.0mm 6.0mm Exposed Junction (simplex)
  3.5mm 6.0mm Exposed Junction (duplex)
  4.0mm 6.0mm Exposed or Insulated Junction
  6.0mm 10.0mm Exposed or Insulated Junction
  8.0mm 12.0mm Exposed Junction
  10.0mm 15.9mm Exposed Junction
  12.0mm 15.9mm Exposed Junctions