Thermocouple Cables

Permanoid manufacture thermocouple extension and compensating leads with a range of conductors. These are manufactured using either Polythene or high temperature PVC. The maximum operating temperature for these cables is 70°C for Polythene or 105°C for PVC.

Cables are constructed generally to BS5308, for multipair cables, with the additional ability to either braid or armour using galvanised steel wire.

These cables can be provided unscreened or screened with either aluminium mylar tape and tinned copper drain wire or copper braided.

The thermocouples produced are types K,J,T,E extension cables and types KCB and RCA/SCA compensating cables.

The conductors are either solid or stranded, as required, and are calibrated to BS4937 Pt 30.

Cables are colour coded to British or International standards. In the case of armoured cables, the sheath is coloured as the required standard.

Pair identification is by a numbered tape.

Thermocouple Types					Conductor size
Type	Positive (+)	Negative (-)	Temp. Range °C*		1/0.8	16/0.2	1/1.29	7/0.53
K	Nickel Chromium	Nickel Aluminium	To 1260	L/R μH/Ω	1.99	2.07	0.77	0.65
J	Iron	Constantan	To 760		1.19	1.24	0.5	0.39
T	Copper	Constantan	-184 to 370		1.02	1.06	0.46	0.33
E	Nickel Chromium	Constantan**	To 870		2.41	2.51	0.93	0.79
KCB***	Copper	Constantan**	To 100
RCA/SCA***	Copper	Cupronic	100 to 200

* Temperature range fo the thermocouple not the cable

** Special constantan. Not the same a type T

*** Compensating leads used to compensate for types R or S

Thermocouple Extension and Compensating Leads - International Colour Codes for Thermocouple Cable Insulation

Cable is required to make the connection between the thermocouple and the measuring instrument. Permanoid can supply either extension or compensating type. Extension cables use the same alloys as the thermocouple, whilst the compensating cable uses different alloys, which have a matched EMF output over the appropriate temperature range.

Cable selection should be made after consideration of the temperature, moisture, chemical and abrasive conditions to which it will be subjected.

EXTENSION CABLES