Thermo Scientific Sarasota SG901, Руководство пользователя

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Calibration
Adjustment
Thermo Fisher Scientific Sarasota SG901 User Guide
5-3
Example
Real SG = 0.88, Displayed SG = 0.8, error = -10%
Line density = 3.84 kg/m
3
Density correction = (Density * (Error %/ 100))
= (3.84 * 0.1) = 0.384 kg/m
3
Change the Doff to 0.384.
Note that if the DCF is used, then
DCF = (1 – (Error % / 100))
In the example, DCF would equal 1.1.
If the applied SG is calculated from MW, compressibility should be taken
into account.
Table 5–1 gives compressibility for gases at the specified conditions. Table
5–2 provides the compressibility at reference conditions (Zref) of 0°C and
1.01325 bar A. This can be used to estimate the compressibility (Z and
Zref) in the density at reference conditions equation (Ref – 1.01325 bar A
and 0°C).
Table 5–1.
Gas Compressibility at specified conditions
Gas Pressure 25°C 30°C 35°C 40°C 45°C
2 bar A 0.9965 0.9967 0.9969 0.9971 0.9973
C1 3 bar A 0.9948 0.9951 0.9954 0.9957 0.9959
4 bar A 0.9931 0.9935 0.9939 0.9943 0.9946
2 bar A 0.9849 0.9856 0.9864 0.9870 0.9877
C2 3 bar A 0.9772 0.9783 0.9794 0.9805 0.9814
4 bar A 0.9694 0.9710 0.9725 0.9738 0.9751
2 bar A 0.9677 0.9694 0.9710 0.9725 0.9739
C3 3 bar A 0.9508 0.9535 0.9559 0.9582 0.9603
4 bar A 0.9333 0.9370 0.9404 0.9435 0.9465
2 bar A 0.9383 0.9420 0.9483 0.9483 0.9512
C4 3 bar A Liquid Liquid 0.9153 0.9203 0.9248
4 bar A Liquid Liquid Liquid Liquid 0.8968
2 bar A Liquid Liquid Liquid Liquid Liquid
C5 3 bar A Liquid Liquid Liquid Liquid Liquid
4 bar A Liquid Liquid Liquid Liquid Liquid