Honeywell DCP200 Sensor Placement Thermocouple or RTD, Thermocouple Wire Identification Chart

DCP200 Profile Controller & Recorder - Product Manual

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:

+ Wire	Sheath
- Wire

Table 2. Thermocouple Extension Wire Colours

Type		International		USA ANSI		British		French		German
		IEC584-3		MC 96.1		BS1843		NFC 42-324		DIN 43710
	+*	Black		White		Yellow		Yellow		Red
J			Black		Black		Black		Black		Blue
	-	White		Red		Blue		Black		Blue
	+
		Brown		Blue		White		Yellow		Red
T			Brown		Blue		Blue		Blue		Brown
	-
		White		Red		Blue		Blue		Brown
	+
		Green		Yellow	Yellow	Brown	Red	Yellow	Yellow	Red	Green
K			Green
	-*	White		Red		Blue		Purple		Green
	+
		Pink		Orange	Orange	Orange	Orange
N			Pink
	-	White		Red		Blue
	+
		Grey		Grey						Red
B			Grey		Grey						Grey
	-
		White		Red						Grey
	+
		Orange		Black		White		Yellow		Red
R & S			Orange		Green		Green		Green		White
	-	White		Red		Blue		Green		White
	+			White
C (W5)					White
	-			Red

Note:

*= Wire is magnetic

Page 24 Electrical Installation 51-52-25-150, Issue 1 – April 2009