HT Ordering Information

ORDERING INFORMATION

 

 How to order wire and plug assemblies:

T-77

Example:  Part Number T-77N-24DAE(9.3)O-48

  • Style Number:  T-77
  • Insulation Material:  N – 99.4% min MgO purity
  • Sheath Length “L” in inches:  24 inches
  • Sheath Diameter:  D – 0.125 inch
  • Wire Calibration:  AE – Type C wire
  • Hot Junction:  (9.3) – Ungrounded
  • Sheath Material:  O – Molybdenum
  • Extension Wire Length “A” in inches:  48 inches

Wire Termination Style Thermocouples

Catalogue Standard TC Drawings (2)

HT_T-14
HT_T-107
HT_T-99
HT_T-31
Plug Termination Style Thermocouples
HT_T-77
HT_T-103
HT_T-37
HT_T-91
HT_HI_T-91
HT_T-191

ARi Part Numbering Symbols/Codes
Wire Type Symbol Sheath Type Symbol Insulation Type Symbol Sheath Diameter (inches) Code
S S Inconel 600 B Magnesia (MgO) N 0.040 A
R R Platinum 10% Rhodium AH Alumina Oxide (Al²O³) A 0.060 (.060)*
B B Tantalum N Hafnia Oxide (HfO²) H 0.062 B
C AE Molybdenum O Beryllia Oxide (BeO) B 0.118 (.118)*
D AO Niobium 1% Zirconium AV     0.125 D
    Coated Molybdenum OCR     0.177 (.177)*
            0.188 E
            0.236 (.236)*
            0.250 F

 *Non-standard/ metric size.

 

Thermocouple Wire Types
Sheath Type Wire Type Wire Symbol Standard Limits Of Error Recom. Temp. Range
Platinum 30% Rhodium (+) Vs. Platinum 6% Rhodium (-) B B ± 0.5% 870 – 1700 °C
Tungsten 5% Rhenium (+) Vs. Tungsten 26% Rhenium (-) C AE ± 4.4 °C (0 – 426 °C)* 0 – 2200 °C
± 1% (426 – 2315 °C)*
Tungsten 3% Rhenium (+) Vs. Tungsten 25% Rhenium (-) D AO ± 4.4 °C (0 – 426 °C)* 0 – 2200 °C
± 1% (426 – 2315 °C)*
Platinum 13% Rhodium (+) Vs. Platinum R  R  ± 1.5 °C or 0.25% **  0 – 1450 °C
Platinum 10% Rhodium (+) Vs. Platinum S  S  ± 1.5 °C or 0.25% **    0 – 1450 °C

*Per ASTM E-988

**Per ASTM E-230

 

Insulation Materials
Insulation Type ARi Symbol Maximum Operating Temp (°C) Approximate Melting Temp (°C) Comments
Magnesia (MgO) N 1700 2800 Very hydroscopic.  Used mostly in compacted sheaths.
 Alumina Oxide (Al²O³) A 1550 2040 Excellent with Platinum alloys.
Hafnium Oxide (HfO²) H 2200 2790 Comparable to Beryllium Oxide and safe to handle.
Beryllium Oxide (BeO)*** B 2200 2650 Excellent High Temperature thermal conductivity and resistivity.

***Beryllium is considered a toxic material and can cause health problems if particles are inhaled.