YOKOGAWA EXAxt 450 User Manual

49
IM 12D06D05-01E
A
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).
K
T
K
ref
=
1+α ( T - T
ref
)
K
2
- K
1
α
=
K
1
( T
2
- T
ref
) - K
2
( T
1
- T
ref
)
K
1
K
2
K
ref
=
=
1+α ( T
1
- T
ref
)
1+α ( T
2
- T
ref
)
K
1
(1 + α ( T
2
- T
ref
)) = K
2
(1 + α ( T
1
- T
ref
))
K
1
+ α ( T
2
- T
ref
) - K
2
+ α ( T
1
- T
ref
) = K
2
- K
1
Where T
1
, T
2
:liquidtemperature(°C)
K
1
: conductivity at T
1
(°C)
K
2
: conductivity at T
2
(°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.

YOKOGAWA EXAxt 450 Specifications

General

Brand	YOKOGAWA
Model	EXAxt 450
Category	Media Converter
Language	English