82
Reference Manual
00809-0300-4750, Rev CA
March 2016
4.5
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 123
).
Pulse output
- The
pulse output
variable provides the pulse value in terms of a frequency for
the flow rate.
4.5.1
PV - Primary variable
The
primary variable
shows the current measured flow rate. This value determines the
analog output from the transmitter.
4.5.2
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
Field Mount: Home screen if configured to display flow
Wall Mount: FLOW RATE
Traditional Fast Keys
1, 1, 1
Device dashboard
1, 2
LOI menu path
Field Mount: Home screen if configured to display percent span
Wall Mount: N/A
Traditional Fast Keys
1, 1, 2
Device dashboard
3, 4, 4, 2
Summary of Contents for Rosemount 8750W
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