Sheet 8745-1 Page 2
Head Type
Length
Type and Tube
Mounting Options
Tip and Vent Options
Immersion Length
Wire or Tip Option
Type and Tube
Flange or Bushing with Immersion Length
Head Style
Tube Length
Straight Assemblies with Full Length Ceramic Protecting Tubes
Straight Assemblies with Full Length Metal Protecting Tubes
LEGEND: Actual Curves 1 - Type E Chromel
THERMOCOUPLE TYPES
Temperature, C
Constantan
2 - Type J Iron
204
427
649
871
1093
1315
1538
1761
1985
2219
70
1
Reference Junction at 0 C (32 F)
Constantan
3 - Type T
60
Copper Constantan
4
50
4 - Type K
Chromel Alumel
2
40
C
5 - Type R
Platinum, 13% Rhodium Platinum Platinum, 10% Rhodium Platinum
30
A
6 - Type S
5
20
A
6
C
3
7 - Type B
7
10
Platinum, 30% Rhodium Platinum, 6% Rhodium Tentative Curves: A - Tungsten, 5% Rhenium Tungsten, 26% Rhenium B - 40% Iridium, 60% Rhodium Iridium C - Tungsten Tungsten, 26% Rhenium
B
0
12 14 16 18
22 24 26 28
32 34 36 38
42
2 4 6 8
2000
3000
4000
1000
Temperature, F
Type T Copper, Constant: High resistance to corrosion from atmospheric moisture condensation. Can be used in either oxidiz- ing or reducing atmospheres.
Type R and S Platinum-Rhodium, Platinum; Type B Plati- num-30% Rhodium, Platinum-6% Rhodium. Recommended for use in oxidizing atmospheres. Easily contaminated in any other atmosphere, so caution should be used in these cases.
Type E Chromel † , Constantan † : Primarily for oxidizing atmo- spheres. Does not corrode at sub-zero temperatures.
40% Iridium-60% Rhodium, Iridium: Suitable for oxidizing and inert atmospheres or vacuum.
Type K Chromel, Alumel ‡ : Recommended between 583°C (1000°F) and 1093°C (2000°F) in oxidizing atmospheres.
Tungsten, Tungsten-26% Rhenium; Tungsten-5% Rhenium, Tungsten-26% Rhenium: Recommended for reducing and inert atmospheres or vacuum. CAUTION: DO NOT use in the presence of FREE OXYGEN.
Type J Iron, Constantan: Suitable where free oxygen is deficient. As oxidation of the iron conductor increases rapidly above 583°C (1000°F), heavier gauge wires should be used at high tempera- tures.
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