Wika TGT73 Manuel d'utilisateur télécharger pdf (Page 19)

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

+/Sig+

+0V/Sig-

Evaluation

(display)

Power supply

Terminal box

Earth, connected

to case

out

Terminals 4, 5 and 6:

only for internal use

+/Sig+

+0V/Sig-

Evaluation

(display)

Power supply

As a power supply, an unstabilised DC power supply is sucient, with

a max. ripple of 10 % ss in the range of the specied 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.

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Wika TGT73 Manuel d'utilisateur Page 19