Yokogawa EXAxt SC450 4-Wire Analyzer for Conductivity/Resis Uživatelský manuál stáhnout pdf (Strana 54)

IM 12D08N05-01E

Appendix 1

Temperature compensation

The conductivity of a solution is very dependent on temperature. Typically for every 1°C change in

temperaturethesolutionconductivitywillchangebyapproximately2%.Theeffectoftemperature

varies from one solution to another and is determined by several factors like solution composi-

tion,concentrationandtemperaturerange.Acoefficient(α)isintroducedtoexpresstheamountof

temperatureinfluencein%changeinconductivity/°C.Inalmostallapplicationsthistemperature

influence must be compensated before the conductivity reading can be interpreted as an accurate

measure of concentration or purity.

NaCl or standard temperature compensation

FromthefactorytheEXAxtissetwiththedefaultofageneraltemperaturecompensationfunction

basedonaSodiumChloride(tablesalt)solution.Thisissuitableformanyapplicationsandiscom-

patible with the NaCl compensation functions of typical laboratory or portable instruments.

SCtemperaturecompensation.

Table 11-1. NaCl-compensation according to IEC 60746-3 with Tref = 25 °C

Configure calculated temperature coefficient (TC).

Followrouting

Commissioning >> Measurement setup >>

Temp.compensation >> T.C.

Enter the temperature coefficient calculated from the

following formula:

A. Calculation of temperature coefficient factor

( With known conductivity at reference temperature).

- K

ref

α =

T - T

ref

100

ref

α =Temperaturecompensationfactorin%/°C

T =Measuredtemperaturein°C

 =ConductivityatT

ref

 =Referencetemperature

ref

 =ConductivityatT

ref

APPENDICES

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Yokogawa EXAxt SC450 4-Wire Analyzer for Conductivity/Resis Uživatelský manuál Strana 54