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10.4 Electric Conductivity Correction
10.4.1
Standard conductivity correction factor
The indication of the density meter varies with the conductivity of the measured object fluid; however,
the variance is as small as approx. 0.15%TS to 1mS/cm change in conductivity and usually practically
negligible, thus making it unnecessary to input the conductivity meter signal to perform electric
conductivity correction. In the event that the conductivity change is large and thus its impact is not
ignoble, make sure to use the electric conductivity correction function. The formula for this correction
including the other corrections described in Chapter 9 is as follows.
△θ={θ
△θ : Phase difference (degrees)
θ
2
θ
1
α
Τ
Τ
０
δ
Ｇ
Ｇ
０
γ
E
E
０
β
A
A
０
At the time of factory shipment, the [electric conductivity correction factor γ] is set to zero for all the
products. If the conductivity change of the measured object fluid is large, input the electric conductivity
signal in accordance with "Fig.3.5 External Connection Diagram" and then reset the [electric
conductivity correction factor γ].
Table 10.4.1 shows the "standard values" of electric conductivity correction factors as well as the
"density line slope (a)" required in the event of obtaining electric conductivity correction factors
through calculation from measured values. The "standard values" shall be applicable when the range of
the electric conductivity meter used for conductivity correction is
0 to 10 mS/cm.
-α（Τ-Τ
）-δ（Ｇ-Ｇ
2
０
: Actual phase angle of measured object liquid (degrees)
: Phase during zero water measurement (degrees)
(Measured during zero calibration, and set in advance as a constant)
: Liquid temperature correction factor (degrees/°C)
: Liquid temperature of measured object liquid (°C)
: Liquid temperature during zero calibration
(Measured during zero calibration, and set in advance as a constant)
: RF correction factor
: RF data during measurement
: Zero point RF data
(Measured during zero calibration, and set in advance as a constant)
: Electric conductivity correction factor (degrees/(mS/cm))
: Electric conductivity of measured object liquid (mS/cm)
: Zero water conductivity (mS/cm)
: Atmospheric temperature correction factor (degrees/°C)
: Atmospheric temperature of measured object liquid (°C)
: Atmospheric temperature during zero calibration
(Measured during zero calibration, and set in advance as a constant)
) - β(A - A
）-γ(E-E
０
０
86
6 F 8 A 0 7 8 7
)} -θ
1
０
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