Rosemount 8712, Reference Manual

Page: 32 / 212

Reference Manual
00809-0100-4664, Rev BA
January 2010
Rosemount 8712
3-6
DIAGNOSTIC
MESSAGES
The following error messages may appear on the LOI screen. See
“Maintenance and Troubleshooting” on page 6-1 for potential causes and
corrective actions for these errors:
• Electronics Failure
• Coil open circuit
• Digital trim failure
• Auto zero failure
• Auto trim failure
• Flow rate >42 ft/sec
• Analog out of range
• PZR activated
• Empty pipe
• Reverse flow
• Reverse flow indicator
(A flashing letter “R” on the LOI indicates a reverse flow)
• Totalizer indicator
(A flashing letter “T” on the LOI indicates to totalizer is activated)
Review
The 8712 includes a capability that enables you to review the configuration
variable settings.
The flowmeter configuration parameters set at the factory should be reviewed
to ensure accuracy and compatibility with your particular application of the
flowmeter.
NOTE
If you are using the LOI to review variables, each variable must be accessed
as if you were going to change its setting. The value displayed on the LOI
screen is the configured value of the variable.
PROCESS VARIABLES
The process variables measure 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
Process Variable (PV) – The actual measured flow rate in the line. Use the
Process Variable 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.
Totalizer Setup – Provides a reading of the total flow of the flowmeter since
the totalizer was last reset. The totalizer value should be zero during
commissioning on the bench, and the units should reflect the volume units of
the flow rate. If the totalizer value is not zero, it may need to be reset. This
function also allows for configuration of the totalizer parameters.
Pulse Output – The pulse output variable provides the pulse value for the flow
rate.
Fast Keys 1, 5
Fast Keys 1, 1