Wika T12 Manuale Utente Scaricare il pdf (Pagina 14)

3211517.0707/2010GB/D

14 WIKAoperatinginstructionstemperaturetransmitterT12

4. Design and function

4.1 Description

ThetemperaturetransmittermodelT12.x0isusedforconvertinga

resistancevalueoravoltagevalueintoaproportionalcurrentsignal

(4...20mA).

Thusthesensorsarepermanentlymonitoredfortheirfault-free

operation.

Theanaloguesignalistransmittedtoaseries-connectedlogicunit

(e.g.aPLCoraswitchcontact)whereitismonitoredforanydeviation

overamaximumvalueorbelowaminimumvalue.

Forfailuremonitoring,thelogicunitmustbecapableofrecognising

bothHIalarms(adjustablefrom21...23.0mA)andLOalarms

(3.6mA).Theelectricalcomponentsofthetransmitteraremountedin

aplasticcaseandfullyencapsulated.

Thetemperaturetransmittermeetstherequirementsfor:

■

Explosionprotection(dependingontheversion)

■

Electromagneticcompatibilityinaccordancewith2004/108/EG

■

SignallingattheanalogueoutputinaccordancewithNAMUR

recommendationNE43

4.3 Scope of delivery

Cross-checkscopeofdeliverywithdeliverynote.

4. Design and function

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Wika T12 Manuale Utente Pagina 14