Cat16 R2

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Thermocouple and Extension Wire - General Information and Limits of Error

Limits of Error for Thermocouple Wire -

CELSIUS

FAHRENHEIT

Standard Grade (Larger of)

Special Grade (Larger of)

Standard Grade (Larger of)

Special Grade (Larger of)

Calibration Material

Temperature Range

Temperature Range

Type

Platinum, 30% Rhodium vs. Platinum, 6% Rhodium

870°C to 1700°C

1600°F to 3100°F

B

±0.5%

-

±0.5%

-

Nickel, 10% Chromium vs. Constantan

E

0°C to 900°C ±1.7°C or ±0.5%

±1°C or ±0.4%

32°F to 1650°F

±3°F or ±0.4%

±2°F or ±0.4%

J

Iron vs. Constantan

0°C to 750°C ±2.2°C or ±0.75% ±1.1°C or ±0.4% 32°F to 1400°F ±4°F or ±0.75% ±2°F or ±0.4%

Nickel, 10% Chromium vs. Nickel, 5%, Al, Si, .1% Mg

K

0°C to 1260°C ±2.2°C or ±0.75% ±1.1°C or ±0.4% 32°F to 2300°F ±4°F or ±0.75% ±2°F or ±0.4%

Ni, 14% Cr, 1.5% Si vs. Ni, 4.5% Si, 1% Mg

N

0°C to 1260°C ±2.2°C or ±0.75% ±1.1°C or ±0.4% 32°F to 2300°F ±4°F or ±0.75% ±2°F or ±0.4%

Platinum vs. Platinum, 13% Rhodium

R

0°C to 1480°C ±1.5°C or ±0.25%

-

32°F to 2700°F ±3°F or ±0.25%

-

Platinum vs. Platinum, 10% Rhodium

S

0°C to 1480°C ±1.5°C or ±0.25%

-

32°F to 2700°F ±3°F or ±0.25%

-

T

Copper vs. Constantan

0°C to 350°C ±1°C or ±0.75% ±0.5°C or ±0.4% 32°F to 660°F ±1.8°F or ±0.75% ±1°F or ±0.4%

Tungsten, 5% Rhenium vs. Tungsten, 26% Rhenium

C

0°C to 2315°C ±4.4°C or ±1%

-

32°F to 4200°F

±8°F or ±1%

-

Percent (%) refers to the measuring temperature, not the range. Tolerances in this table are not for the accuracy of thermocouples that have been in use. They are only for readings during the first initial; heating of the thermocouple elements. For cryogenic temperature materials— phone for details.

Limits of Error for Extension Wire -

CELSIUS

FAHRENHEIT

Calibration Material

Temperature Range

Standard Grade

Special Grade

Temperature Range

Standard Grade

Special Grade

Type

BX

Copper/Magnesium vs. Copper

-

-

-

-

-

-

Nickel, 10% Chromium vs. Constantan

EX

0°C to 200°C

±1.7°C

-

32°F to 400°F

±3°F

-

JX

Iron vs. Constantan

0°C to 200°C

±2.2°C

±1.1°C

32°F to 400°F

±4°F

±2°F

Nickel, 10% Chromium vs. Nick- el, 5%, Al, Si

KX

0°C to 200°C

±2.2°C

-

32°F to 400°F

±4°F

-

Ni, 14% Cr, 1.5% Si vs. NI, 4.5% Si, 1% Mg

NX

0°C to 200°C

±2.2°C

±1.1°C

32°F to 400°F

±4°F

±2°F

RX

Copper vs. #11 Alloy

0°C to 200°C ±.057 mv (±5°C) *

-

32°F to 400°F

±.057 mv (±5°C) *

-

SX

Copper vs. #11 Alloy

0°C to 200°C ±.057 mv (±5°C) *

-

32°F to 400°F

±.057 mv (±5°C) *

-

TX

Copper vs. Constantan

0°C to 200°C

±1°C

±0.5°C

32°F to 400°F

±1.8°F

±.9°F

CX

Alloy 405 vs. Alloy 426

0°C to 200°C

±.11 mv

-

32°F to 400°F

±.11 mv

-

* Due to the non-linearity of the Type R and S emf curves, the degree error introduced into a thermocouple system (i.e. the thermocouple and extension wire) will vary with temperature. Consequently, the degree C and degree F tolerances shown in brackets, applies only when the hot measuring junction temperature is greater than 1598°F or 870°C.

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