Wika T12 Manual do Utilizador descarregar pdf (Página 20)

3211517.0707/2010GB/D

20 WIKAoperatinginstructionstemperaturetransmitterT12

6.2.2 Sensors

Schematic representation / conguration

6. Commissioning, operation

Resistance thermometer (RTD) and resistance sensor

Itispossibletoconnectanresistancethermometer(e.g.to

DINEN60751)ina2-,3-or4-wireconnectionmethod.Congurethe

inputofthetransmittertomatchwiththeactualmethodofconnection

used.Otherwiseyouwillnotfullyexploitthepossibilitiesofconnec-

tionleadcompensationand,asaresult,possiblycauseadditional

measuringerrors(seechapter„6.2Conguration“).

Thermocouples (TC)

Makesurethatthethermocoupleisconnectedwiththecorrect

polarity.Iftheleadbetweenthethermocoupleandthetransmitter

needstobelengthened,onlyusethermalorcompensationcablein

accordancewiththetypeofthermocoupleconnected.

Conguretheinputofthetransmitterappropriatelyforthethermo-

coupletypeandthecoldjunctionactuallyused,otherwisemeasure-

menterrorsmaybecaused(seechapter"6.2Conguration").

Shouldthecoldjunctioncompensationbeoperatedwith

anexternalresistancethermometer(2-wireconnection),

connectthistoterminalsand.

Thermocouple

Resistancethermometer/

linearresistance

4-wire3-wire2-wire

CJCwith

external

Pt100/Ni100



Input

mVsensor

4 ... 20 mA loop

CJC

internal

1)Connectsensor(Pt100/Ni100)forexternalcoldjunctioncompensationbetweenterminal1and4.

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