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4 Thermocouples
4 Thermocouples
4.1 Design
A thermocouple essentially comprises a pair of thermal wires, which can be insulated and are inserted
into protection tubes. The thermal wires are connected to thermal or compensating cables. Their con-
nection side can be designed as a line end that has been kept free, or designed with a terminal head,
with a connector, etc.
Alongside a variety of special versions, some thermocouples are described fully by standards, such as
• Straight thermometers with interchangeable sensor units – DIN 43764
• Threaded-stem thermometers with G 1/2 mounting thread – DIN 43765
• Threaded-stem thermometers with G 1 mounting thread – DIN 43766
• Welded-stem thermometers – DIN 43767
• Thermometers not fitted with protecting tubes – DIN 43769
• Fast response thermometers – DIN 43771
• Mineral insulated metal-sheathed thermocouple cables and thermocouples –
DINEN61515
In some cases, individual components are also described by standards, such as
• Protective tubes – DIN 43772
• Flanges – DIN EN 1092
The basic construction is similar to that of RTD temperature probes.
chapter 3.1 "Design", Page 9
The main difference lies in the construction of the measuring insert.
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