21 T/C Leadwire Types

Rolfes @ Boone set the Color-Code Standard for the leadwire industry. With reference to Rolfes @ Boone leadwire as the current and most widely used color-code, use the following charts to verify which code your facility is using.

Note: The #1 Thermocouple at the bottom of each temperature cable.

As an "ease for reading", the first T/C to the last is listed in the following format...

Please read any notes following the chart.


21 Thermocouple (T/C) Leadwire Manufactures
 

T/C Rolfes Burdick HotSpot * Old Rolfes
Constantan White Silver White White
1 Black Brown White

 String

 Violet Red
2 Blue Red Black Black
3 Green Orange Blue Green
4 Red Yellow Green Yellow
5 Yellow Green Red Pink
6 Clear Blue Yellow Blue
7 Violet Violet Clear Violet
Constantan Brown White White Brown
8 Black Brown Yellow

 String

 Violet Red
9 Blue Red Black Black
10 Green Orange Blue Green
11 Red Yellow Green Yellow
12 Yellow Green Red Pink
13 Clear Blue Yellow Blue
14 Violet Violet Clear Violet
Constantan Orange Black White Orange
15 Black Brown Black 

String

 Violet Red
16 Blue Red Black Black
17 Green Orange Blue Green
18 Red Yellow Green Yellow
19 Yellow Green Red Pink
20 Clear Blue Yellow Blue
21 Violet Violet Clear Violet

* The HotSpot leadwire has a BROWN Plastic Jacket and in rare circumstances, depending on the installer, the VIOLET wire in each group may be the SEVENTH Thermocouple in this group.  (i.e. similar to the current industry standard leadwire, black #1, blue #2, green #3, red #4, yellow #5, clear #6 and violet #7)

Verify the color-code with an OHM meter prior to replacement.


 
Rolfes @ Boone
P.O. Box 369
1773 219th Lane
Boone, IA 50036
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