Siemens SITRANS FUH1010PVDX, Руководство по эксплуатации, Страница: 121 / 308

5-19
CQO:1010PVXFM-3 Section 5
Each of the data points of a Site Liquid Table (maximum of 32) may be filled in by the user as indicated
in the menu screen shown above.
Index Value - The temperature-corrected sonic velocity (LiquIdent) which points to the output variables
forming the balance of the table entry. Below this you may enter the values associated with that LiquIdent
value.
S.G. - The specific gravity of the liquid at system Base Temperature, usually 60ºF. By specific gravity we
mean the ratio of equal volumes of this liquid and water at this base temperature.
Viscosity - The kinematic viscosity of the liquid at system Base Temperature (units: centistokes).
Visc Slope - The exponent of the logarithmic expression used to project the liquid viscosity at measured
temperature. The default value (-0.0287) has been found to be adequate for many hydrocarbons.
γγγγγ
n
=
e
where:
γ
n
= Kinematic viscosity at current measured temperature (cS)
e = Base of natural logarithms
V
SLP
= Viscosity Slope (i.e., -0.0287)
Ì
t = Current Measured Temperature minus Base Temperture (degrees F)
γ
b
= Visc @ Base Temperature (cS)
( )
V
SLP
x
Ì Ì
Ì Ì Ì
t + ln(
γγγγγ
b
)
Siemens Dual Path Site 1
LiquIdent Index
Index Value 1440
Visc (cS) @ 400 1.00
Visc Slope @ 400 -0.0287
Kill Index @ 400 No
Temperature Corrected Vs Index