Richards Thermocouple and Temperature Sensor Catalog 16

111 / 204

Limits of Error for Thermocouple Wire -
CELSIUS FAHRENHEIT
Type Calibration
Material
Temperature
Range
Standard
Grade
(Larger of)
Special
Grade
(Larger of)
Temperature
Range
Standard
Grade
(Larger of)
Special
Grade
(Larger of)
B Platinum, 30% Rhodium vs.
Platinum, 6% Rhodium
870°C to
1700°C
±0.5% - 1600°F to
3100°F
±0.5% -
E Nickel, 10% Chromium vs.
Constantan
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%
K Nickel, 10% Chromium vs.
Nickel, 5%, Al, Si, .1% Mg
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%
N Ni, 14% Cr, 1.5% Si vs.
Ni, 4.5% Si, 1% Mg
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%
R Platinum vs.
Platinum, 13% Rhodium
0°C to 1480°C ±1.5°C or ±0.25% - 32°F to 2700°F ±3°F or ±0.25% -
S Platinum vs.
Platinum, 10% Rhodium
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%
C Tungsten, 5% Rhenium vs.
Tungsten, 26% Rhenium
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
Type Calibration
Material
Temperature
Range
Standard
Grade
Special
Grade
Temperature
Range
Standard
Grade
Special
Grade
BX Copper/Magnesium vs. Copper - - - - - -
EX Nickel, 10% Chromium vs.
Constantan
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
KX Nickel, 10% Chromium vs. Nick-
el, 5%, Al, Si
0°C to 200°C ±2.2°C - 32°F to 400°F ±4°F -
NX Ni, 14% Cr, 1.5% Si vs.
NI, 4.5% Si, 1% Mg 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 Celsius and degree Fahrenheit tolerances shown in brackets, applies only when
the hot measuring junction temperature is greater than 1598°F or 870°C.
Thermocouple and Extension Wire - General Information and Limits of Error
Manufacturing, Engineering and Sales Since 1938
Phone: 617.527.4385 Fax: 617.964.3746 Email:
Page 111 Visit our website at
LIMITS