Rf Correction; Atmospheric Temperature Correction - Toshiba LQ300A00 Series Operation Manual

9.2.3

RF correction

In addition to the liquid 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 θ2 as follows
to obtain the phase difference △θ.
△θ={θ −α（Τ−Τ
2
: Phase difference [degrees]
△θ
: Actual phase angle of measurement object liquid [degrees]
θ
2
: Phase during zero water measurement (degrees)
θ
１
(Measured during zero point calibration, and set in advance as a constant)
: Liquid temperature correction factor (degrees/°C)
α
T : Temperature of measurement object liquid (°C)
T 0 : Liquid temperature during zero calibration (°C)
(Measured during zero calibration, and set in advance as a constant)
: RF correction factor
δ
: RF data during measurement
Ｇ
: Zero point RF data
Ｇ
０
(Measured during zero point calibration, and set in advance as a constant)
9.2.4

Atmospheric temperature correction

In addition to the liquid temperature correction and the RF correction, the density meter is equipped
with the atmospheric temperature correction function in accordance with the features of the converter.
The correction is performed on θ2 as follows to obtain the phase difference △θ.
<IMPORTANT> Atmospheric temperature correction function is an option item, therefore, make sure
to set the atmospheric temperature correction factor β to "0.00".
△θ={θ −α（Τ−Τ
2
△θ : Phase difference [degrees]
: Actual phase angle of measurement object liquid [degrees]
θ
2
: Phase during zero water measurement (degrees)
θ
１
(Measured during zero point calibration, and set in advance as a constant)
: Liquid correction factor (degrees/°C)
α
: Temperature of measurement object liquid (°C)
Τ
: Liquid temperature during zero adjustment (°C)
Τ
０
(Measured during zero point calibration, and set in advance as a constant)
: RF correction factor
δ
: RF data during measurement
Ｇ
: Zero point RF data
Ｇ
０
(Measured during zero point calibration, and set in advance as a constant)
β
: Atmospheric temperature correction factor (degrees/°C)
A : Atmospheric temperature of measurement object liquid (°C)
A : Atmospheric temperature during zero adjustment (°C)
０
(Measured during zero point calibration, and set in advance as a constant)
）−δ（Ｇ−Ｇ ）}−θ
０ ０
）−δ（Ｇ−Ｇ
０
 76 
1
）−β（A−A ）}−θ
０ ０
6 F 8 A 0 7 8 7
1