User's Manual

2-14
1010NFM-3JSection 2
How to Edit the Viscosity (cS) Setting
The [Viscosity cS] menu cell shows the kinematic viscosity of the selected liquid (in centistokes). 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
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. The default specific gravity setting is 1.000. The flow computer uses the liquid’s specific gravity to
form a multiplier for the conversion of volumetric flow to mass flow. Mass flow appears (in selected
units) on the display screen. [Density SG] (as it applies to this system) is defined as the ratio of the
mass of this liquid to the mass of an equal volume of water at 20°C or 68°F.
ENT
To edit the Density SG setting:
To activate numeric entry press
Use the numeric keys to type the Density SG value.
To register the data press
2.3.2 UniMass TABLE
Some 1010 family meters provide a feature we call UniMass. These meters support a UniMass Table
which associates the metered liquid’s current temperature and sonic velocity (Vs) with its specific
gravity and viscosity. These variables are then used to provide mass metering and real-time flow
profile compensation based on Reynold’s numbers. For hydrocarbon liquids requiring standard vol-
ume compensation, a 1010DV flowmeter should be specified.
Note that the UniMass option will provide value to the extent that the table is accurately prepared for
your particular liquid and installed correctly. The table scanning routine can function with as few as two
(completely) defined data points. If the sensed variable(s) assume values beyond the table limits, the
routine does not extrapolate, but rather produces “flat” or “clipped” data, assuming the value of the last
valid table entry.
ENT