Pv Units; Range Values; Pv Damping - Emerson Rosemount 8600 Series Reference Manual

Reference Manual
May 2019
2.3.7

PV units

FastKeys
Selections for this include all units available for the selection of PV. This will set the units for
the flow rate or process temperature.
2.3.8

Range values

FastKeys
Range Values enables you to maximize resolution of analog output. The meter is most
accurate when operated within the expected flow ranges for your application. Setting the
range to the limits of expected readings will maximize flowmeter performance.
The range of expected readings is defined by the Lower Range Value (LRV) and Upper Range
Value (URV). Set the LRV and URV within the limits of flowmeter operation as defined by the
line size and process material for your application. Values set outside that range will not be
accepted.
Primary Variable Upper Range Value (PV URV)
FastKeys
This is the 20 mA set point for the meter.
Primary Variable Lower Range Value (PV LRV)
FastKeys
This is the 4 mA set point for the meter, and is typically set to 0 when the PV is a Flow
Variable.
2.3.9

PV damping

FastKeys
Damping changes the response time of the flowmeter to smooth variations in output
readings caused by rapid changes in input. Damping is applied to the Analog Output,
Primary Variable, Percent of Range, and Vortex Frequency. This will not affect the Pulse
Output, Total, or other Digital Information.
The default damping value is 2.0 seconds. This can be reset to any value between 0.2 to 255
seconds when PV is a flow variable or 0.4 to 32 seconds when PV is Process Temperature.
Determine the appropriate damping setting based on the necessary response time, signal
stability, and other requirements of the loop dynamics in your system.
Note
If the vortex shedding frequency is slower than the damping value selected, no damping is
applied.
Rosemount 8600 Vortex Flow Meter
1, 3, 7
1, 3, 8
1, 3, 8, 1
1, 3, 8, 2
1, 3, 9
Configuration
00809-0100-4860, Rev BF
17