Toshiba Density (Consistency) Meter LQ500, Operation Manual

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9.2.3 RF correction
In addition to the fluid temperature correction, the density meter is equipped with the RF correction
function in accordance with the features of the converter. The correction is performed on
θ
2 as
follows to obtain the phase difference
△θ
.
△θ
={
θ
2
−α（Τ−Τ
０
）−δ（Ｇ−Ｇ
０
）
}
−θ
1
△θ
: Phase difference [degrees]
θ
2
: Actual phase angle of measurement object fluid [degrees]
θ
１
: Phase during zero water measurement (degrees)
(Measured during zero point calibration, and set in advance as a constant)
α
: Fluid correction factor (degrees/
℃
)
Τ
: Temperature of measurement object fluid (
℃
)
Τ
０
: Water temperature during zero adjustment (
℃
)
(Measured during zero point calibration, and set in advance as a constant)
δ
: RF correction factor
Ｇ
: RF data during measurement
Ｇ
０
: Zero point RF data
(Measured during zero point calibration, and set in advance as a constant)
9.2.4 Ambient temperature correction
In addition to the fluid temperature correction and RF correction, the density meter is equipped with
the ambient temperature correction function. The correction is performed on
θ
2
as follows to
obtain the phase difference
△θ
.
<Note> Since ambient temperature correction function is an option, ambient temperature
correction factor ß must be set “0.00”.
△θ
={
θ
2
−α（Τ−Τ
０
）−δ（Ｇ−Ｇ
０
）
ß
（Ａ‐Ａ
０
）
}
−θ
1
△θ
: Phase difference (degrees)
θ
2
: Actual phase angle of measurement object fluid (degrees)
θ
１
: Phase during zero water measurement (degrees)
(Measured during zero point calibration, and set in advance as a constant)
α
: Fluid correction factor (degrees/
℃
)
Τ
: Temperature of measurement object fluid (
℃
)
Τ
０
: Water temperature during zero adjustment (
℃
)
(Measured during zero point calibration, and set in advance as a constant)
δ
: RF correction factor
Ｇ
: RF data during measurement
Ｇ
０
: Zero point RF data
(Measured during zero point calibration, and set in advance as a constant)
ß : Ambient temperature correction factor (degrees/
℃
)
Ａ
: Ambient temperature (
℃
)
Ａ
０
: Ambient temperature during zero adjustment
(Measured during zero point calibration, and set in advance as a constant)