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.
Set Frequency Output Scaling Method.
Option Description
Frequency=Flow (default)
Frequency calculated from flow rate
Pulses/Unit
A user-specified number of pulses represents one flow unit
Units/Pulse
A pulse represents a user-specified number of flow units
2. 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.
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
The maximum flow rate that you want the frequency output to report.
Above this rate, the transmitter will report A110: Frequency Output Saturated.
Frequency
Factor
A value calculated as follows:
FrequencyFactor = x N
RateFactor
T
where:
T
Factor to convert selected time base to seconds
N
Number of pulses per flow unit, as configured in the receiving device
The resulting Frequency Factor must be within the range of the frequency output (0 to
10,000 Hz):
• If Frequency Factor is less than1 Hz,reconfigure the receiving device for a higher
pulses/unit setting.
• If Frequency Factor is greater than 10,000 Hz, reconfigure the receiving device for a
lower pulses/unit setting.
Integrate the meter with the control system
Configuration and Use Manual 91
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