- 43 -
Tolerance of the thermocouple probes:
The tolerance of a type of thermocouple corresponds to the maximum acceptable deviation 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 tolerances refer to the operating temperature expected for the thermocouple, in agreement with
the diameter of the thermoelements.
TOLERANCE CLASSES OF THERMOCOUPLES
Tolerances according to
IEC 60584-2
standard.
The values refer to thermocouples with
reference junction at 0 °C
.
Tolerance class 1
Tolerance class 2
Tolerance class 3
Type of
thermocouple
Temperature
range
(°C)
Tolerance
(°C)
Temperature
range
(°C)
Tolerance
(°C)
Temperature
range
(°C)
Tolerance
(°C)
B
--- ---
+600…+1700
± 0.0025
⋅
t
+600…+800
± 4
--- --- --- ---
+800…+1700
± 0.005
⋅
t
E
-40…+375
± 1.5
-40…+333
± 2.5
-167…+40
± 2.5
+375…+800
± 0.004
⋅
t
+333…+900
± 0.0075
⋅
t
-200…-167
± 0.015
⋅
t
J
-40…+375
± 1.5
-40…+333
± 2.5
---
---
+375…+750
± 0.004
⋅
t
+333…+750
± 0.0075
⋅
t
--- ---
K , N
-40…+375
± 1.5
-40…+333
± 2.5
-167…+40
± 2.5
+375…+1000 ± 0.004
⋅
t
+333…+1200 ± 0.0075
⋅
t
-200…-167
± 0.015
⋅
t
R , S
0…+1100
± 1
0…+600
± 1.5
---
---
+1100…+1600
± [1+0.003
⋅
(t-1100)]
+600…+1600 ± 0.0025
⋅
t
--- ---
T
-40…+125
± 0.5
-40…+133
± 1
-67…+40
± 1
+125…+350
± 0.004
⋅
t
+133…+350
± 0.0075
⋅
t
-200…-67
± 0.015
⋅
t
Note: t = temperature of measurement junction in °C.
