WIKA T32.1S Betriebsanleitung Seite 33

9. Electrical connections
Should the cold junction compensation be operated with
an external resistance thermometer (2-wire connection),
connect this to terminals  and .
9.3.4 Connect mV-sensor
Make sure that the mV-sensor is connected with the correct polarity.
9.3.5 Potentiometer
Connection of a potentiometer is possible.
9.4 HART signal
®
The HART -signal is measured directly via the 4 ... 20 mA signal line.
®
The measuring circuit must have a load of at least 250 Ω. However,
the load must not be too high, as otherwise, in the case of relatively
high currents, the terminal voltage at the transmitter will be too low.
For that reason, connect the cable clamps of the modem and/or
the HART communicator, as described (see chapter "6.5 HART
®
configuration tree" or use the existing communication connectors of a
power supply/line transformer. The connection of the HART
and/or the HART
HART modem or the HART
®
parallel to the resistor! When connecting an Ex-version of the
transmitter, observe the special conditions for safe use (see chapter
"10. Notes for mounting and operating in hazardous areas").
WIKA operating instructions temperature transmitter T32.xS
communicator is not dependant on polarity! The
®
communicator may also be connected
®
GB
®
modem
®
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