Yokogawa ISC450 4-Wire Analyzer for Inductive Conductivity Instrukcja Użytkownika Pobierz pdf (Strona 57)

IM 12D06D05-01E

APPENDICES

B. Calculation of temperature coefficient factor

(with two known conductivity values at different temperatures)

Measure the conductivity of the liquid at two temperatures, one below the reference and above

thereferencetemperaturewiththetemperaturecoefficientsetto0,00%/°Candusethefollowing

equationtocalculateatemperaturecoefficient(α).

ref

1+α ( T - T

ref

)

- K

( T

- T

ref

) - K

( T

- T

ref

)

ref

1+α ( T

- T

ref

)

1+α ( T

- T

ref

)

(1 + α ( T

- T

ref

)) = K

(1 + α ( T

- T

ref

))

+ α ( T

- T

ref

) - K

+ α ( T

- T

ref

) = K

- K

Where T

, T

:liquidtemperature(°C)

K

: conductivity at T

(°C)

K

: conductivity at T

(°C)

Figure 11-1. Conductivity

Calculation example

Calculate the temperature co-efficient of a liquid from the following data.

Conductivity124.5µS/cmataliquidtemperatureof18.0°Canda

conductivity147.6µS/cmataliquidtemperatureof31.0°C.

Substitutingthedataintheaboveformulagivesthefollowingresult.

147.6 - 124.5

x 100= 1.298 %/C

α =

124.5(31.0 - 25) - 147.6(18.0 - 25)

SetthetemperaturecoefficientintheISC450Gconverter.

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