09/2006 GB
WIKA Alexander Wiegand GmbH & Co. KG
Alexander-Wiegand-Straße 30
63911 Klingenberg/Germany
Phone (+49) 93 72/132-0
Fax (+49) 93 72/132-406
www.wika.de
Analogue Temperature Transmitters
Model T91.30
C_224.01
Pt100
230 VAC
24 VDC
Load
(PLC, PC)
876
12 34
Zero
Span
!
Pt100
C_214.01
230 VAC
24 VDC
Load
(PLC, PC)
876
12 34
Zero
Span
Operating Instructions
1. Safety instructions
When mounting, commissioning and operating these
transmitters, it is important to observe the respective
national safety precautions and regulations in effect
(e.g. VDE 100). Nonobservance of the applicable
regulations may cause severe injury to persons or damage to
equipment. Only staff with suitable qualifications should work with
these transmitters. Before commissioning, check the instrument's
suitability for the intended application. In particular, it is important
to observe the ambient and operating limits as specified in the
WIKA data sheet, TE 91.02.
2. Mounting
The model T91.30 transmitters are intended for mounting on a
standard rail.
They can be fastened without tooling by clipping onto a 35 mm
DIN rail (DIN EN 50 022-35). To remove, release the clip
mechanism.
3. Maintenance
The temperature transmitters described here are maintenance
free! The electronics do not incorporate any components which
could be repaired or replaced. Depending upon operating
conditions, it may be advisable to check the calibration of the
transmitter yearly.
4. Electrical connections
These transmitters have an internal galvanic connection between
the sensor input and analogue output. No external connection
should be made (for example, by earthing) between the
connected temperature sensor and analogue output! For this
reason it is best to use isolated thermocouples. (With the
exception of model T91.30.232: This transmitter is galvanically
isolated between input and output. For further information on this
model, see point 4.2).
For flying leads we recommend using crimped connector sleeves.
To connect a thermocouple: Make sure that the thermocouple is
connected with the correct polarity. If the cable between the
thermocouple and the transmitter must be extended, only use the
appropriate thermal or compensating cable for the connected
thermocouple type.
4.1 Pt100 input
Model T91.30.214
Pt100 in 2- or 3-wire connection.
For a 2-wire connection the resistance of the wires affects the
measurement results. Therefore this circuit should only be
selected if the wires are short, or accuracy requirements are low.
If using a 2-wire connection, always connect a jumper between
terminals 1 and 2, and 3 and 4 respectively.
With a 3-wire connection the measurement results are not
affected by the resistance of the corresponding partial circuit due
to the isolation between the input leads and the power and signal
terminals. If using a 3-wire connection, always connect a jumper
between input terminals 1 and 2.
Model T91.30.224
Pt100 in 2- or 3-wire connection.
With a 2-wire connection, the resistance of the input leads affects
the measurement results. Therefore this connection should only
be selected if the wires are short, or accuracy requirements are
low.
If using a 2-wire connection, always connect a jumper between
input terminals 3 and 4.
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