Operation
Table 4-1: Thermocouple Types in the Model 1140A
Type* Positive Wire Negative Wire Temperature Range
B-MN175
[B-MN125]
70% Pt – 30% Rh Alloy 94% Pt – 6% Rh Alloy
250°C to 1820°C
482°F to 3308°F
523.15 K to 2093.15 K
22.33°R to 3767.67°R
C 95% W – 5% Re Alloy 74% W – 26% Re Alloy
0°C to 2315.56°C
32°F to 4200.01°F
273.15 K to 2588.71 K
491.67°R to 4659.68°R
D 97% W – 3% Re Alloy 75% W – 25% Re Alloy
0°C to 2320°C
32°F to 4208°F
273.15 K to 2593.15 K
491.67°R to 4667.67°R
E-MN175
[E-MN125]
90% Ni – 10% Cr Alloy
(Chromel)
55% Cu – 45% Ni Alloy
(Constantan)
−270°C to 1000°C
−454°F to 1832°F
3.15 K to 1273.15 K
5.67°R to 2291.67°R
G 100% W 74% W – 26% Re Alloy
0°C to 2315.56°C
32°F to 4200.01°F
273.15 K to 2588.71 K
491.67°R to 4659.68°R
J-MN175
[J-MN125]
100% Fe
55% Cu – 45% Ni Alloy
(Constantan)
−210°C to 1200°C
−346°F to 2192°F
63.15 K to 1473.15 K
113.67°R to 2651.67°R
K-MN175
[K-MN125]
90% Ni – 10% Cr Alloy
(Chromel)
96% Ni – 2% Mn –
2% Al Alloy (Alumel)
−270°C to 1372°C
−454°F to 2501.6°F
3.15 K to 1645.15 K
5.67°R to 2961.27°R
N-MN175
[N-MN161]
84% Ni – 14% to 14.4%
Cr – 1.3% to 1.6% Si Alloy
95% Ni – 4.2% to 4.6% Cr
– 0.5% to 1.5% Mg Alloy
−270°C to 1300°C
−454°F to 2372°F
3.15 K to 1573.15 K
5.67°R to 2831.67°R
PLII
(Platinel II™)
Proprietary Platinum Alloy Proprietary Platinum Alloy
0°C to 1395°C
32°F to 2543°F
273.15 K to 1668.15 K
459.67°R to 3002.67°R
R-MN175
[R-MN125]
87% Pt – 13% Rh Alloy 100% Pt
−50°C to 1768.1°C [1767.6°C]**
−58°F to 3214.58°F [3213.68°F]
223.15 K to 2041.25 K [2040.75K]
401.67°R to 3674.25°R [3673.35°R]
S-MN175
[S-MN125]
90% Pt – 10% Rh Alloy 100% Pt
−50°C to 1768.1°C [1767.6°C]**
−58°F to 3214.58°F [3213.68°F]
223.15 K to 2041.25 K [2040.75K]
401.67°R to 3674.25°R [3673.35°R]
T-MN175
[T-MN125]
100% Cu
55% Cu – 45% Ni Alloy
(Constantan)
−270°C to 400°C
−454°F to 752°F
3.15 K to 673.15 K
5.67°R to 1211.67°R
* MN175 is NIST Monograph 175, which is based on ITS-90. When using IPTS-68, the thermocouple types are
those shown in [brackets], referencing NIST Monograph 125 and Monograph 161.
** The upper temperature limits for Types R and S are slightly lower in NIST Monograph 125 than in NIST
Monograph 175.
4-5
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