EN
11WIKA operating instructions, models TRxx and TCxx
14150915.08 04/2024 EN/DE/FR/ES
Sensor connection methods
■
2-wire connection
The lead resistance to the sensor is recorded as an error in the measurement. For
this reason, this connection type is not advisable when using Pt100 measuring resis-
tors for accuracy classes A and AA, since the electrical resistance of the connection
leads and their own temperature dependency are fully included in the measuring
result and thus falsify it.
■
3-wire connection (standard version)
The influence of the lead resistance is, largely, compensated for. The maximum
length of the connection lead depends on the conductor cross-section and the
compensation options of the evaluation electronics (transmitter, display, controller or
process control system).
■
4-wire connection
The influence of the connection lead on the measuring result is completely elimina-
ted since any possible asymmetries in the lead resistance of the connection lead
are also compensated. The maximum length of the connection lead depends on the
conductor cross-section and the compensation options of the evaluation electronics
(transmitter, display, controller or process control system). A 4-wire connection can
also be used as a 2-wire or 3-wire connection by disconnecting the unnecessary
conductors.
→ For further information on the sensor connection methods, see chapter 9 “Specifica-
tions” and technical information IN 00.17
Model TCxx thermocouples consist of mineral-insulated sheathed cable. The tempera-
ture-sensitive measuring point of the thermocouple is located in the probe tip.
The measuring point (welding point) is insulated from the surrounding sheathed cable
(standard version).
For specific applications, the measuring point will be welded to the base of the sheathed
cable.
→ For further information on the sensor connection types, see chapter 9 “Specifications”
and technical information IN 00.23.
4. Design and function
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