Wika T12 Manuel d'utilisateur télécharger pdf (Page 33)

3211517.0707/2010GB/D

WIKAoperatinginstructionstemperaturetransmitterT12 33

11. Faults

Fault-tree

l=0mA

Currentloop

disconnected

Wrongpolarityof

thesupplyvoltage

Transmitternot

connected

Wrongsensortype

Wrong2-,3-or

4-wireconnection

Wrong

temperaturerange

Wrong

compensation

Sensor=

Sensor=

RTD

l>20mA

l<4mA

4mA<l<20mA

butwrongvalues

Currentvalueisokay,but

temperaturedriftwhile

transmitterisheatingupor

coolingdown

Process

temperatureoutof

range

Wrongsensor

connection

Sensorburnoutor

shortcircuit

Wrongtransmitter

conguration

Capacitiveor

inductivecoupling

overthesensor

Capacitiveor

inductivecoupling

overtheloop

Wrongpolarityof

thermocouple

Loopresistancetoohigh

Electromagnetic

interferences

Linearizationerrorfor

sensor/transmitter

Currentvaluefallswhile

measuringtemperaturerises

(andviceversa)

Currentvalueisokayatlow

values,buttoolowathigher

temperatures

Currentvalueisunstableand

changeswithinseconds

Temperaturevaluesonly

correctatthemeasuringlimits

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Wika T12 Manuel d'utilisateur Page 33

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