Barometric Pressure; Dp Zero Cutoff; Orifice Material; Figure 3 Constants Tab - ABB Totalflow uFLO 6213 Application Manual

3.2.1

Barometric Pressure

Barometric Pressure (PSIA) is a floating point number that represents the barometric
pressure. Enter the current barometric pressure within the corresponding field.
3.2.2

Dp Zero Cutoff

Dp Zero Cutoff (In H20) is a floating point value that represents the lowest expected
non-zero differential pressure reading. A reading less than this value will cause the
value, 0.0, to be used for the differential pressure for flow rate and volume calculation.
The value, shown under the Current Values tab within the Flow Measurement
application, is filtered. To test this, use the following steps.
1) Set the Dp Zero Cutoff value to the Dp reading value. A holding register used
2) Select the Current Values tab.
3) Click the Re-read button. Verify the Diff. Pressure Value is equal to or greater
To view information on how to test this feature, please refer to the Test section later in
this manual.
3.2.3

Orifice Material

The Orifice Material field enables the user to make selections based on the type of
material used for the orifice plate. The current selections are Stainless or Monel. The
selection effects the orifice expansion factor (Fa). Changing this selection will effect
flow rate by a relatively small amount. These rate changes can be viewed within the
Current Values tab.
2012981-001 rev. AB
for the Dp ensures that this is easy to test. A Dp transducer or Totalflow test box
can be used.
than the Dp Zero Cutoff.

Figure 3 Constants Tab

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