82.031.0101.0 WIELAND ELECTRIC, 82.031.0101.0 Datasheet - Page 499

• Manufacturer Part Number: 82.031.0101.0
• Description: COUPLING MODULE
• Manufacturer: WIELAND ELECTRIC

Specifications of 82.031.0101.0

• Connector Type: Modular
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

dipos
dipos
2, 3 or 4 wire connection technology
for RTD/Pt sensors
The range provided by Wieland offers
devices for all connection technologies.
The appropriate technique is used,
depending on the accuracy requirement.
The individual measurement types are
described in detail as follows.
The obvious benefit of a 2-wire
connection lies in the minimum wiring
costs. It should however be noted that
greater errors can occur during
measurement using this method. In the
case of a Pt100 sensor, an additional
resistance of only one ohm is sufficient
for an error of 2.5°C. This error acts as an
offset (zero displacement). This type of
increase in resistance can be caused by
cable resistances, contact resistances,
soldered connections, plugs etc. In order
to compensate for these errors, the
Wieland modules offer a zero balance.
This does not however prevent errors
from occurring during operation that are
caused by variations in the ambient
temperature.
In practice, a 2-wire connection is only
recommended if the application does not
require a high level of accuracy.
In the case of a 3-wire connection, one of
the sensor cables is used for measuring
the cable and contact resistances. The
influence of the additional resistances can
thus be largely eliminated. This however
only applies under one condition which is
often not observed:
The resistances of the three cables and
the respective connectors must match
exactly.
A differential of 0.39 ohm already causes
an error of 1 degree (Pt100). Only the
respective state can be equalized by
carrying out an adjustment during
commissioning. It is not possible to
remedy the sources of error that are
caused by temperature.
In the case of 4-wire technology, two
cables take over the temperature
measurement and two further cables
measure at high resistance the voltage
drop that arises via the resistance-type
sensor.
All the effects caused by contact or cable
resistances are fully eliminated.
The error is maximum 0.004% per ohm.
There is practically no influence produced
on the output variable. It is irrelevant if
the resistances have different values and
are subjected to different conditions due
to the application.
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