WIKA TGT73 - Manual (Page 19)

GB
14028755.02 08/2012 GB/D/F/E
WIKA operating instructions model TGT73 19
8. Electrical connection / 9. Maintenance ...
2-wire system 3-wire system
e.g. 4 ... 20 mA e.g. 0 ... 10 V
Earth, connected
to case
Terminals 3, 4, 5 and 6:
only for internal use
U
B
+/Sig+
+0V/Sig-
Evaluation
(display)
Power supply
Terminal box
Earth, connected
to case
I
out
/U
out
Terminals 4, 5 and 6:
only for internal use
U
B
+/Sig+
+0V/Sig-
Evaluation
(display)
Power supply
As a power supply, an unstabilised DC power supply is sufficient, with
a max. ripple of 10 % ss in the range of the specified power supply
limits. It is important to ensure that the applied power supply is at least
greater than the maximum required voltage drop from the external
display and evaluation units; i.e. the voltage at the transmitter must
not fall below 12 V.
9. Maintenance and cleaning
9.1 Maintenance
Gas-actuated thermometers with transmitters are maintenance-free!
The indicator should be checked once or twice every year. To do this
the instrument must be disconnected from the process and checked
using a temperature calibrator.
Repairs must only be carried out by the manufacturer.