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Rosemount 8600 Vortex Flow Meter
Reference Manual
May 2019
Operation
00809-0100-4860, Rev BF
4.3.3 Signal processing
The Rosemount 8600D and its HART-based communications feature enable you to filter
out noise and other frequencies from the transmitter signal. The four user-alterable
parameters associated with the digital signal processing on the Rosemount 8600D include
low-pass filter corner frequency, low-flow cutoff, trigger level, and damping. These four
signal conditioning functions are configured at the factory for optimum filtering over the
range of flow for a given line size and service type (liquid or gas). For most applications,
leave these parameters at the factory settings. Some applications may require adjustment
of the signal processing parameters.
Use signal processing only when recommended in the Troubleshooting section of this
manual. Some of the problems that may require signal processing include:
High output (output saturation)
Erratic output with or without flow present
Incorrect output (with known flow rate)
No output or low output with flow present
Low total (missing pulses)
High total (extra pulses)
If one or more of these conditions exist, and you have checked other potential sources
(K-factor, service type, lower and upper range values, 4–20mA trim, pulse scaling factor,
process temperature, pipe ID), refer to Section 5: Troubleshooting. Remember that the
factory default settings can be re-established at any time with Filter Restore. If problems
persist after signal processing adjustments, consult the factory.
Optimize flow range
Automatically sets the 8600D filter levels, Low Flow Cutoff (LFC), Trigger Level, and Low
Pass Corner Frequency, to optimum settings based on the process density and process fluid
type.
Primary Variable (PV)
The actual measured variable rate in the line. On the bench, the PV value should be zero.
Check the units on the PV to make sure they are configured correctly. See PV Units if the
units format is not correct. Use the Process Variable Units function to select the units for
your application.
Low flow cutoff
Shown in engineering units.
FastKeys
1, 4, 3
FastKeys
1, 4, 3, 1
FastKeys
1, 4, 3, 1, 1
FastKeys
1, 4, 3, 1, 2
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