YOKOGAWA FLXA21

<Appendix 3 For ISC (Inductive Conductivity)>
App.3-2
IM 12A01A02-01E 8th Edition : Oct. 01, 2015-00
A. Calculation of temperature coefcient factor (With known conductivity at reference
temperature).
K
t
- K
ref
α =
T - T
ref
100
K
ref
X
α = Temperature compensation factor in %/°C
T = Measured temperature in °C
K
t
= Conductivity at T
T
ref
= Reference temperature
K
ref
= Conductivity at T
ref
B. Calculation of temperature coefcient 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 coefcient set to 0,00%/°C and use
the following equation to calculate a temperature coefcient (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 1 Conductivity