User Manual

06-DPP-UM-00147 02/12 41
FLUID SPECIFIC GRAVITY
SP GRAV -- Fluid Specic Gravity (Value)
Unitless Value
Allows adjustments to be made to the specic gravity (density relative to water) of the liquid.
If Pounds (LBS) or Kilograms (KGS) is selected for either the RATE UNT or the TOTL UNT, a specic gravity
must be entered for the correct mass ow to be calculated. A list of uids and their associated specic
gravities is located in the Appendix of this manual.
NOTE: Specic Gravity only appears when LBS or KGS are selected in either Rate Unit or Total Unit
LOW FLOW CUTOFF
F C-OFF -- Low Flow Cut-o (Value)
Unitless Value
A Low Flow Cut-o entry is provided to allow very low ow rates (that can be present when pumps are
o and valves are closed) to be displayed as Zero ow. The value entered is in actual rate units.
SCALE FACTOR
SCALE F -- Scale Factor (Value)
0.500 to 5.000
This function can be used to make the DFX system agree with a dierent of reference ow meter, or to
compensate for an installation where there is inadequate straight pipe to obtain a laminar ow pro-
le, by applying a correction factor/multiplier to the readings and outputs. A factory calibrated system
should be set to 1.000. The range of settings for this entry is 0.5000 to 5.000. The following example
describes using the SCALE F entry.
The DFX meter is indicating a ow rate that is 4% higher than another ow meter located in the
same pipe line. To make the DFX indicate the same ow rate as the other meter, enter a SCALE F
of 0.960, to lower the readings by 4%.
SYSTEM DAMPING
DAMPING -- System Damping (Value)
Relative Percent Entry: 0-99%
Flow Filter Damping establishes a maximum adaptive lter value. Under stable ow conditions (ow var-
ies less than 10% of reading), this adaptive lter will increase the number of successive ow readings that
are averaged together up to this maximum value. If ow changes outside of the 10% window, the Flow
Filter adapts by decreasing and allows the meter to react faster. Increasing this value tends to provide
smoother steady-state ow readings and outputs.