Siemens SITRANS FUH1010PVDX, Руководство по эксплуатации, Страница: 120 / 308

5-18
CQO:1010PVXFM-3 Section 5
Setting the LiquIdent Index
A Liquid Class must have an associated LiquIdent Index Scale. The FUH1010PVX uses this scale to
compensate its outputs for variations in liquid type, specific gravity, and viscosity. The LiquIdent Index
Scale enables the following:
Reynolds number compensation over the entire temperature range.
Positive liquid identification.
A LiquIdent Index is the sonic velocity for the liquid at the Base Temperature, generally 60ºF (15ºC).
When a LiquIdent Index is entered for a particular liquid within the Liquid Class, the liquid’s specific gravity
and its viscosity must also be entered at the LiquIdent Index.
To create a LiquIdent Index Scale for the Liquid Class, a minimum of two LiquIdent Indices are required to
be entered. If desired, up to thirty-two LiquIdent Indices can be entered. However, the computer only
needs two to establish a scale of all the possible LiquIdent™ indices for the Liquid Class. If a LiquIdent
beyond the limits of the table is sensed, the instrument uses the last valid values creating a “clipped”
table. The instrument does not extrapolate output variables.
After the computer interpolates the LiquIdent Index Scale, its projections can be checked by entering a
meaningful LiquIdent Index and examining the reported specific gravity and viscosity values. The scale
can be fine-tuned by manually adjusting the factors at up to thirty-two points.
To enter the LiquIdent Index:
From the [Liquid Table] menu cell, press to scroll down to [LiquIdent Index].
Press to enable numeric entry.
Use the keypad numeric keys to enter the desired LiquIdent Index.
To enter the LiquIdent Index press .
ENT
Calculate the average of all the Pressure Slope Factors within the Liquid Class.
To enter the Pressure Slope Factor:
From the [Liquid Table] menu cell, press to scroll down to Pressure Slope .
Press to enable numeric entry.
Use the keypad numeric keys to enter the desired Pressure Slope Factor.
To enter the Pressure Slope Factor press .
ENT