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Reference Manual
00809-0100-4444, Rev AC
Section 4: Operation
January 2015
Operation
4.4 Process variables
Process variables are available through the field communicator or AMS software suite. These
variables display flow in several ways that reflect your needs and the configuration of your
flowmeter. When commissioning a flowmeter, review each process variable, its function and
output, and take corrective action if necessary before using the flowmeter in a process
application.
Primary variable (PV) - The actual measured flow rate of the process fluid. Use the flow units
function to select the units for your application.
Percent of range - The process variable as a percentage of the analog output range, provides an
indication where the current flow of the meter is within the configured range of the flowmeter.
For example, the analog output range may be defined as 0 gal/min to 20 gal/min. If the
measured flow is 10 gal/min, the percent of range is 50 percent.
Analog output - The analog output variable provides the analog value for the flow rate. The
analog output refers to the industry standard output in the 4-20 mA range. The analog output
and 4-20 mA loop can be verified using the Analog Feedback diagnostic capability internal to
the transmitter (See “4-20 mA loop verification” on page 117).
Pulse output - The pulse output variable provides the pulse value in terms of a frequency for the
flow rate.
4.4.1 PV - Primary variable
The primary variable shows the current measured flow rate. This value determines the analog
output from the transmitter.
4.4.2 PV - Percent of range
The PV% range shows where in the flow range the current flow value is as a percentage of the
configured span.
LOI menu path
N/A
Traditional fast keys
1,1
Device dashboard
1
LOI menu path
Home screen if configured to display flow
Traditional fast keys
1,1,1
Device dashboard
1,2
LOI menu path
Home screen if configured to display percent span
Traditional fast keys
1,1,2
Device dashboard
3,4,4,2