HD2328
- 17 -
V1.7
The tolerance of a type of thermocouple corresponds to the maximum acceptable
departure from the e.m.f. of any thermocouple of that type, with reference junction at
0°C.
The tolerance is expressed in degrees Celsius, preceded by the sign.
The percentage tolerance is given by the ratio between the tolerance expressed in
degrees Celsius and the measurement junction temperature, multiplied by one
hundred.
The thermocouples conforming to regulations must comply with one of the following
tolerance levels, the values of which are reported in the table.
G I (special tolerances)
G II (normal tolerances)
The tolerances refer to the expected thermocouple operating temperature, in
agreement with the thermoelements' diameter.
Tolerance of the thermocouples:
Type of
themocouple
Range °C
G I*
G II*
K
0 … +1370°C
±1.1°C or ±0.4%
±2.2°C or ±0.75%
J
0 … +750°C
±1.1°C or ±0.4%
±2.2°C or ±0.75%
T
0 … +400°C
±0.5°C or ±0.4%
±1°C or ±0.75%
E
0 … +750°C
±1°C or ±0.4%
±1.7°C or ±0.5%
K**
-200 … 0°C
---
±2.2°C or ±2%
T**
-200 … 0°C
---
±1°C or ±1.5%
E**
-200 … 0°C
---
±1.7°C or ±1%
* The higher of the two optional limits is the valid one. Example: at 200°C the
percentage tolerance for type K thermocouple, tolerance G II, is ±0.75% and is equal
to ±1.5°C. Therefore, the limit of ±2.2°C is valid. On the other hand, at 600°C the
percentage tolerance is equal to ±4.5°C, and therefore this is the limit to use.
** The thermocouples that meet the limits for temperatures higher than 0°C do not
necessarily meet the limits for the range under 0°C.
Summary of Contents for Delta OHM HD2328.0
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