DCP200 Profile Controller & Recorder -Product Manual
Page 24 Electrical Installation 51-52-25-150, Issue 1 –April 2009
Sensor Placement (Thermocouple or RTD)
If the temperature probe is to be subjected to corrosive or abrasive conditions, it must be
protected by an appropriate thermowell. The probe must be positioned to reflect true process
temperature:
1. In a liquid media -the most agitated area
2. In air - the best circulated area
CAUTION:
The placement of probes into pipe work some distance from the heating vessel
leads to transport delay, which results in poor control.
For a two wire RTD, a wire link should be used in place of the third wire (see the wiring
section for details). Two wire RTDs should only be used with lead lengths less than 3 metres.
Use of three wire RTDs is strongly recommended to reduce errors do to lead resistance.
Thermocouple Wire Identification Chart
The different thermocouple types are identified by their wires colour, and where possible, the
outer insulation as well. There are several standards in use throughout the world.
The table below shows the wire and sheath colours used for most
common thermocouple types. The format used in this table is:
Table 2. Thermocouple Extension Wire Colours
Type
International
IEC584-3
USA ANSI
MC 96.1
British
BS1843
French
NFC 42-324
German
DIN 43710
J+* Black Black White Black Yellow Black Yellow Black Red Blue
-White Red Blue Black Blue
T+Brown Brown Blue Blue White Blue Yellow Blue Red Brown
-White Red Blue Blue Brown
K+Green Green Yellow Yellow Brown Red Yellow Yellow Red Green
-* White Red Blue Purple Green
N+Pink Pink Orange Orange Orange Orange
-White Red Blue
B+Grey Grey Grey Grey Red Grey
-White Red Grey
R & S +Orange Orange Black Green White Green Yellow Green Red White
-White Red Blue Green White
C (W5) +White White
-Red
Note:
*= Wire is magnetic
+Wire Sheath
-Wire