Thermocouples

Therm-x manufactures thermocouples for use in labs and the semiconductor industry where many processes operate in vacuum or gases. Use of multiple Mineral insulated thermocouple elements in a vacuum flange allows measurement of multiple points with one chamber feedthrough. Click for options for KF and CF thermocouples


Custom Options

  • Single or Multi Point
  • Helium Leak tested
  • Optional Calibration
  • Bendable
  • Optional screw on and spring loaded bushings
  • Operating temperatures -50°C – 500°C
  • Accuracy dependent on TC type
  • Electro polished
  • Passivated
  • Clean room packaged

 

Spring loaded Thermocouples

These thermocouples work great in any industry and operate in in vacuum or gases. Spring loaded tip and threaded bushing ensure intimate contact and repeatability.


Custom Options

  • Type K Special limits of error
  • Helium Leak tested
  • Optional Calibration
  • Bendable
  • Electro polished
  • Passivated
  • Clean room packaged
  • Threaded spring loaded bushings

Mineral Insulated Thermocouples

M.I Cable Thermocouples

Mineral Insulated Thermocouples (MI) thermocouples consist of matched thermocouple wires surrounded by insulating material (typically magnesia oxide) compacted by drawing or swaging the sheath. The result is a rugged and reliable construction suitable for a wide variety of applications including Semiconductor wafer processing, heat treating, medical, nuclear reactors, refineries and oil processing, vacuum furnaces, laboratory and research, etc. Advantages of mineral insulated thermocouples are:

  • Useable under severe conditions
  • Withstands temperatures up to metal melting point
  • Withstands corrosive conditions limited only by the choice of sheath material
  • Can be formed to a minimum radius of twice the sheath diameter without loss of integrity
  • Can be welded, brazed or soldered to other metals when proper techniques are used
  • Can be formed to a minimum radius of twice the sheath diameter without loss of integrity
  • Available in a wide variety of diameters from .010” to .500”
  • Available in standard and special limits of error
  • Can withstand external pressures up to 50,000 psi
  • Multiple element cable is available

M.I. Cable Specifications

  • Sheath Diameter: ± .002" or ± 1% of nominal diameter, whichever is greater.
  • Wall Thickness: ± .0015" or ± 15% of nominal wall thickness, whichever is greater, 10% of diameter as a minimum.
  • Insulation Material: 98% (min.) MGO Magnesium Oxide
  • Insulation Temp.: Insulation is useable over a temperature range of -450°F to 3000°F without change of phase or chemical reaction with adjacent metals. Melting temperature of insulation is 4800°F. Limiting temperature is associated with sheath material used.
logo Thermocouple Wire Specifications
T/C Type Single color Ansi Color Coding
Overall Extension
Overall thermocouple Conductor Alloys Temperature Range°F(°C)
Thermocouple Grade
Extension Grade
Tolerance(standard)
/ whichever is Greater
Tolerance(Special)
/ whichever is Greater
E Purple
Red
Purple Brown EP/EN Chromel/Constantan -328 to 1652
(-200 to 900)
32 to 392
(0 to 200)
+-1.7 deg C
or +-0.5%
+-1.0 deg C
or +-0.4%
J White
Red
Black Brown JP/JN Iron/Constantan 32 to 1382
(0 to 750)
32 to 392
(0 to 200)
+-2.2 deg C
or +-0.75%
+-1.1 deg C
or +-0.4%
K Yellow
Red
Yellow Brown KP/KN Chromel/Alumel -328 to 2282
(-200 to 1250)
32 to 392
(0 to 200)
+-2.2 deg C
or +-0.75%
+-1.1 deg C
or +-0.4%
N Orange
Red
Orange Brown NP/NN Nicrosil/Nisil -450 to 2372
(-270 to 1300)
32 to 392
(0 to 200)
+-2.2 deg C
or +-0.75%
(2% below 0 deg C)
+-1.1 deg C
or +-0.4%
T Blue
Red
Blue Brown TP/TN Copper/Constantan -328 to 662
(-270 to 350)
32 to 392
(0 to 200)
+-2.2 deg C
or +-0.75%
(1.5% below 0 deg C)
+-0.5 deg C
or +-0.4%
B Grey
Red
Grey None BP/BN Platinum 30% Rhodium
Platinum 6% Rhodium
32 to 3092
(0 to 1700)
32 to 212
(0 to 100)
+-3.7 deg C
or +-0.5% over 800 deg C
NOT ESTABLISHED
C White
Red
White
Red Trace
None CP/CN Tungsten 5% Rhenium
Tungsten 26% Rhenium
32 to 4208
(0 to 2320)
32 to 1600
(0 to 870)
+-4.5 deg C to or 425 deg C
1% to 2320 deg C
NOT ESTABLISHED
R/S Black
Red
Green None RP/RN R=Platinum/13% Rhodium
S=10% Rhodium/Pure Platinum
32 to 2462
(0 to 1450)
32 to 300
(0 to 150)
1.5 deg C or .25% .6 deg C or .1%

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