Configure Frequency Output Scaling Method - Emerson Micro Motion 1700 Configuration And Use Manual

6.3.2

Configure Frequency Output Scaling Method

Display
ProLink III
Field Communicator Configure > Manual Setup > Inputs/Outputs > Frequency Output > FO Scaling
Overview
Frequency Output Scaling Method defines the relationship between output pulse and flow
units. Set Frequency Output Scaling Method as required by your frequency receiving
device.
Procedure
1.
2.
Calculate frequency from flow rate
The Frequency=Flow option is used to customize the Frequency Output for your application
when you do not know appropriate values for Units/Pulse or Pulses/Unit.
If you specify Frequency=Flow, you must provide values for Rate Factor and Frequency
Factor:
Rate Factor
Frequency
Factor
Configuration and Use Manual
OFF-LINE MAINT > OFF-LINE CONFG > IO > CH B > SET FO > FO SCALE
Device Tools > Configuration > I/O > Outputs > Frequency Output
Set Frequency Output Scaling Method.
Option
Frequency=Flow (default)
Pulses/Unit
Units/Pulse
Set additional required parameters.
• If you set Frequency Output Scaling Method to Frequency=Flow, set Rate Factor
and Frequency Factor.
• If you set Frequency Output Scaling Method to Pulses/Unit, define the number of
pulses that will represent one flow unit.
• If you set Frequency Output Scaling Method to Units/Pulse, define the number of
units that each pulse will indicate.
For all scaling methods, the transmitter puts out a fixed number of pulses per unit,
and at the same time, the Frequency Output signal varies in proportion to flowrate.
The maximum flow rate that you want the Frequency Output to report.
A value calculated as follows:
FrequencyFactor =
where:
Integrate the meter with the control system
Description
Frequency calculated from flow rate
A user-specified number of pulses represents one flow unit
A pulse represents a user-specified number of flow units
RateFactor
x N
T
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