Wika T32.xS Manual do Utilizador descarregar pdf (Página 33)

11258421.10 08/2014 GB/D

WIKA operating instructions model T32.xS 33

9.3 Sensors

9.3.1 Schematicrepresentation,conguration

Thermocouple

Resistance thermometer/

resistance sensor

4-wire 3-wire 2-wire

CJC with

external Pt100

Input

Sensor 1

Sensor 2

Sensor 1

Sensor 2

9. Electrical connections

9.3.2 Resistance thermometer (RTD) and resistance sensor

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

EN 60751) or any resistance sensor in a 2-, 3- or 4-wire connection

method and to connect two identical resistance thermometers, having

the same measuring ranges, in a two-wire circuit. 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 connection lead

compensation and, as a result, possibly cause additional measuring

errors (see chapter 6.3 “Conguration”).

9.3.3 Thermocouples (TC)

It is possible to connect one or two identical thermocouples. Make

sure that the thermocouple is connected with the correct polarity. If

the lead between the thermocouple and the transmitter needs to be

extended, only use thermal or compensation cable appropriate for the

connected thermocouple type.

Congure the input of the transmitter appropriately for the

thermocouple type and the cold junction compensation actually

used, otherwise measurement errors may be caused (see chapter

6.3 “Conguration”).

Duplex

thermocouple

duplex mV-

Sensor

Potentio-

meter

Dual resistance

thermometer/

Dual resistance

sensor

2+2-wire

1 2 ... 28 29 30 31 32 33 34 35 36 37 38 ... 91 92

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