Yokogawa EXAxt SC450 4-Wire Analyzer for Conductivity/Resis Manual do Utilizador descarregar pdf (Página 55)

IM 12D08N05-01E

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)

: conductivity at T 1 (°C)

: conductivity at T 2 (°C)

Figure 11-1. Conductivity

Calculation example

Calculate the temperature coefficient 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SC450Gconverter.

1 2 ... 50 51 52 53 54 55 56 57 58 59 60 ... 70 71

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