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

Section 2

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. If the estimated Vs is substantially differ-
ent from the measured value, the flow computer will request that you re-space the transducers during
the transducer install procedure.
NOTE: During the transducer install procedure (see paragraph 2.4), you can ignore a respacing
request by pressing the <Down Arrow> instead of the <ENT> key. If this triggers a
Spacing Alarm, check Diagnostic/Data [Site Setup Data] menu cell 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
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

How to Edit the Density (SG) Setting

Use the Density (SG) menu cell to edit the nominal specific gravity of the selected liquid. This allows
the flow computer to provide a flow rate output in mass units, if required. This mode suits applications
where the density is not only known, but also fixed, due to well-controlled liquid temperature and chem-
istry.
ENT
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ENT
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