Thermocouples TC

Thermocouples (TC)

Content thermoelements

Catalogue download

Functionality / basics
Thermoelements delivery program survey
Thermopairs - types, materials, colour codes
Compensation line
Tolerances according to IEC 60 584
Thermoelements contact series (Type J, K, S and T)

TE-MI-(type K) with bare thermowire ends

Functionality / basics

The measured quantity temperature (TM) is transformed by a thermoelement without further auxiliary voltage source into an electrical voltage (UT). Inside every electrical conductor an electromotive force originates (EMK), if it is exposed to a temperature gradient. This EMK is dependent from the amount of the temperature gradient but also from its direction. Originates e.g. an increasing temperature gradient a positive EMK, so originates a decreasing temperature gradient a negative EMK. The amount of the resulting EMK is consequently dependent on the temperature difference between the two ends of the conductor. If two metals with most possible different thermo force are connected to a thermopair, so between the two free ends a voltage originates, which is dependent on the temperature difference of the connection point to the free end and the difference of the thermo forces of both metals.

Delivery program survey

Delivery program survey of thermoelements according to EN 60 584 and DIN 43 710
Thermo wires(TD) and compensation lines (AGL)	blank	Not insulated thermo wires of all available types, single (+ or - pole of the thermopair) or in pairs.
	Insulated	Insulated thermo wires of all available types, single (+ or - pole of the thermopair) or in pairs.
Winding tip thermoelements (TE-WK)	blank	Simplest design, thermopair with blank measuring point, max. temperature dependent on the thermopair.
	SH	Thermopair with shrinkage tube insulated measuring point (PTFE or PVDF),max. temperature 175°C...260°C.
	KH / MH	Thermopair, cemented in ceramic or metal sleeve, max. temperature approx. 500°C.
	SGH	Thermopair, cemented in Al or Ms screw-in housing, temperature approx. 500°C.
Slot thermoelements (TE-NT)	rigid design	Analogue to slot resistance thermometers with mica insulation usable temperature detector for industrial motor protection, types T, J, E, K, U and L, max. temperature up to 230°C.
Foil thermoelements (TE-F)	in polyimid or Al and polyamid foil	Extremely quick responding (<100 ms), thin thermopairs (types K, T and J) for surface measurements up to +200°C.
Plug-in thermoelements (TE-EST)	straight design	Thermoelement with fix screwing or bayonet-joint, free line ends or plug connector - even detector tip, half round or conical.
	angled design	dto. but with put angle plug.
Jacket thermoelements TE-MI)	with plug connection, free line ends or connector tip	Bendable, quick responding TE with high vibration resistance, ø0,5mm ... 8,0mm, with or without insulation against the housing, max. temperature 1300°C.
Thermoelements with protection tube and connector tip (TE-SRA)	with or without screwing, with fix mounted measuring adapter	For technical temperature measurement, mainly for all kinds of stoves, temperature ranges up to 1800°C, protection tubes made of metal and ceramic. For different applications are connecting tips according to DIN 43 729 available.
	with changeable measuring adapter	dto. with changeable measuring adapter, which allows and exchange of the thermoelement during operation.
Thermoelement measuring adapters (TE-MES)	1, 2 or 3 thermopairs	Measuring adapters for mounting in protection tubes with connector tip, according to DIN or with jacket line.
Thermoelement plug and clutches	Standard design / midget design	Plug connections for connection and for lengthening of thermoelements.

Thermopairs - types, materials, colour codes

Element	Norm	Material- combination
Type T	EN 60 584	Cu - CuNi
Type E	EN 60584	NiCr - CuNi
Type J	EN 60 584	Fe - CuNi
Type K	EN 60 584	NiCr - Ni
Type S	EN 60 584	Pt10%Rh - Pt
Type R	EN 60 584	Pt13%Rh - Pt
Type B	EN 60 584	Pt30%Rh - Pt
Type L	DIN 43 710	Fe - CuNi
Type U	DIN 43 710	Cu - CuNi
Tabelle [18kB]

The thermopair consists of two different metallic conductors, the so called thermo legs, which are connected with each other at the measuring point.
From the variety of the possible combinations of material are only several suitable for the production of thermoelements for measurement and control technique. The mostly used types of thermoelements are specified in EN 60 584 and DIN 43 710.

Foil thermocouple, 7x7mm

TE-MI with directly connected mini-plug type(K)

Compensation line

The compensation line forms the lengthening of the thermopair. It connects the both thermopairs with the comparison point.
Only materials with high purity and alloys with the same electrical characteristics as these of the to lengthen thermopair can be used. In opposite to the thermo lines the range of temperature at which the compensation line may be installed is highly restricted (approx. 0... +100°C).
The low resistance of substitution materials made these at times of moving-coil measuring instruments become an important component of the meate-suring circuit. Today's digital technique allows however very high input resistance, so that also at compensation lines with higher resistance occur no noticeable losses.

Tolerances

The thermoelement types normed according to IEC 60584 are classified into three tolerance classes:

Class	1	2	3
Max. limit deviation (±) type T	0,5°C or 0,004*\|t\| -40°C ... +350°C	1,0°C or 0,0075*\|t\| -40°C ... +350°C	1,0°C or 0,015*\|t\| -200°C ... +40°C
Max. limit deviation (±) type E type J type K	1,5°C or 0,004*\|t\| -40°C ... +800°C -40°C ... +750°C -40°C ... +1000°C	2,5°C or 0,0075*\|t\| -40°C ... +900°C -40°C ... +750°C -40°C ... +1200°C	2,5°C or 0,015*\|t\| -200°C ... +40°C -200°C ... +40°C
Max. limit deviation (±) type R and S type B	1°C or 1+(t-300)*0,003°C 0°C ... +1600°C	1,5°C or 0,0025*\|t\| 0°C ... +1600°C +600°C ... +1700°C	4°C or 0,005*\|t\| +600°C ... +1700°C
For the calculation of the limit declination the bigger one of the two values is valid. The limit declination of thermoelements is valid for their conditionat delivery.

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Class	1	2	3
Max. limit deviation (±) type T	0,5°C or 0,004*\|t\| -40°C ... +350°C	1,0°C or 0,0075*\|t\| -40°C ... +350°C	1,0°C or 0,015*\|t\| -200°C ... +40°C
Max. limit deviation (±) type E type J type K	1,5°C or 0,004*\|t\| -40°C ... +800°C -40°C ... +750°C -40°C ... +1000°C	2,5°C or 0,0075*\|t\| -40°C ... +900°C -40°C ... +750°C -40°C ... +1200°C	2,5°C or 0,015*\|t\| -200°C ... +40°C -200°C ... +40°C
Max. limit deviation (±) type R and S type B	1°C or 1+(t-300)*0,003°C 0°C ... +1600°C	1,5°C or 0,0025*\|t\| 0°C ... +1600°C +600°C ... +1700°C	4°C or 0,005*\|t\| +600°C ... +1700°C
For the calculation of the limit declination the bigger one of the two values is valid. The limit declination of thermoelements is valid for their conditionat delivery.