How To Edit The Estimated Vs (Liquid Sonic Velocity); How To Edit The Viscosity (Cs) Setting - Siemens SITRANS F Instruction Manual

Section 2
To select a Liquid Class:
To access the option list press
Scroll through the list to find the closest match to the application's liquid.
To register selection press

How to Edit the Estimated Vs (liquid sonic velocity)

During transducer installation, the flow computer bases its initial transducer spacing recommendation
on the value stored in this menu cell. [Estimated Vs m/s] allows you to review and modify (if necessary)
the Vs value for the liquid class you selected.
After you install the transducers, the computer will measure Vs directly. If the displayed (or edited) Vs
stored in this menu cell is accurate, the transducers will be spaced correctly. This will eliminate the need
to re-space the transducers after their initial installation. However, if the estimated Vs is substantially
different from the measured value, the computer will request you to re-space the transducers during the
transducer install procedure.
NOTE: During the Xdcr install procedure (see paragraph 2.4), you can ignore a re-spacing re-
quest by pressing the <Down Arrow> instead of <ENT>. If this triggers a Spacing Alarm,
check [Diagnostic Data/Site Setup Data] to make sure the measured Vs value does not
exceed the Vs max or Vs min items.
To edit the Estimated Vs m/s:
To activate numeric entry press
Type the sonic velocity value using meters-per-second.
To register the data press

How to Edit the Viscosity (cS) Setting

The [Viscosity cS] menu cell shows the kinematic viscosity of the selected liquid (in centi-stokes). The
viscosity value is particularly important for high viscosity liquids. The meter requires an accurate liquid
viscosity to compute the flow profile compensation. If the displayed viscosity is correct, bypass this menu
cell by pressing the <Down Arrow>. Please be aware that the viscosity of the liquid affects the Reynolds
Number compensation applied to the final rate output. Therefore, inaccurate data could cause flow data
errors. Edit this entry only if you know the true viscosity of your liquid. If necessary, our Technical Service
Group can provide reliable viscosity data for most liquids.
To edit the Viscosity setting:
To activate numeric entry press
Use the numeric keys to type the Viscosity value, which must be in centistokes.
To register the data press
ENT
1
ENT
ENT
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