Yokogawa ISC450 4-Wire Analyzer for Inductive Conductivity Manual de usuario descargar pdf (Pagina 56)

48

IM 12D06D05-01E

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func-

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

compatiblewiththeNaClcompensationfunctionsoftypicallaboratoryorportableinstruments.ISC

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 ISC450 4-Wire Analyzer for Inductive Conductivity Manual de usuario Pagina 56