Index Value; Viscosity; Visc Slope; Liquid Name - Siemens SITRANS F FUH1010 Series Operating Instructions Manual

Section 2
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 out-
put 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: centi-
stokes).
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.
(
e
V
γ γ γ γ γ
SLP
=
n
where:
γ
= Kinematic viscosity at current measure temperature (cS)
n
e = Base of natural logarithms
V = Viscosity Slope (i.e., -0.0287)
SLP
t = Current Measured Temperature minus Base Temperature (degrees F)
γ
= Visc @ Base Temperature (cS)
b
Liquid Name - You may install a name here if you wish to identify the liquid in the meter's
datalogger report. To prevent flicker of two names when the LiquIdent is at transition points,
you may wish to create ranges of LiquIdent and additional entries in between with no name
installed.
K0 and K1 - These variables, also found in the global table area as defaults for each table
point, are used by the ASTM D1250 or API 2540 routine to project liquid S.G. at the measured
temperature (refer to Entering K0 and K1 Parameters above). If you are measuring only one
class of liquids, for example oils, accept the default for each data point. For a pipeline carrying
many different hydrocarbon classes, you may be able to create a table that will automatically
move from one set of factors to another, based on LiquIdent. Just as with liquid names, you
Controlotron Dual Path
Temperature Corrected Vs Index

Index Value

S.G. @ 400
Visc (cS) @ 400

Visc Slope @ 400

Liquid Name

K0
K1
Kill Index @ 400
LiquiIdent Index
)
x t + ln(γ γ γ γ γ )
b
Site 1
1440
1.0000
1.00
-0.0287
Crude
341.0957
1.0000
No
2-18
1010BXFM-3