5 Lines
24
5.2
Lines of thermocouples
Thermal cables or compensating cables can be used for thermocouples.
Thermal and compensating cables differ as follows:
Thermal cables are made of the same material as the element itself.
Compensating cables are made of special materials with identical thermoelectric features in restricted
temperature ranges.
When mounting and routing the lines, pay attention to the operating temperatures as they depend on the
materials used. The typical maximum application temperatures are shown in chapter 5.1 "Lines of RTD
temperature probes", Page 22. Follow the particular specifications for the temperature probe in individ-
ual cases.
Data sheet 909735 (compensating cables and connection lines)
Identification marking for compensating cables:
Example: KX = thermal cable NiCr-Ni element type "K" made of thermal material
The limit deviations (in µV or K) only apply at the measurement temperature (right-hand column) here.
This is due to the non-linear nature of the thermoelectric voltage.
1st letter
Identifier for the type of element according to the standard
2nd letter
X = same material as the element according to the standard
C = special material
3rd letter
If there are several compensating cables, the third letter differentiates them.
Element and
wire type
Limit deviation classes
Application
temperature range
Measurement tem-
perature
1
2
In °C
In °C
"JX"
±85 µV/±1.5 K
±140 µV/±2.5 K
-25 to +200
500
"TX"
±30 µV/±0.5 K
±60 µV/±1.0 K
-25 to +100
300
"EX"
±120 µV/±1.5 K
±200 µV/±2.5 K
-25 to +200
500
"KX"
±60 µV/±1.5 K
±100 µV/±2.5 K
-25 to +200
900
"NX"
±60 µV/±1.5 K
±100 µV/±2.5 K
-25 to +200
900
"KCA"
-
±100 µV/±2.5 K
0 to 150
900
"KCB"
-
±100 µV/±2.5 K
0 to 100
900
"NC"
-
±100 µV/±2.5 K
0 to 150
900
"RCA"
-
±30 µV/±2.5 K
0 to 100
1000
"RCB"
-
±60 µV/±5.0 K
0 to 200
1000
"SCA"
-
±30 µV/±2.5 K
0 to 100
1000
"SCB"
-
±60 µV/±5.0 K
0 to 200
1000
