Emerson MMI-20019043 User Manual

6.3.3

Configure Frequency Output Scaling Method

Display

OFF-LINE MAINT

 > OFF-LINE CONFG > IO > CH B > SET FO > FO SCALE

ProLink II

ProLink

 > Configuration > Frequency/Discrete Output > Frequency > Scaling Method

ProLink III

Device Tools

 > Configuration > I/O > Outputs > Frequency Output

Field Communicator Configure > Manual Setup > Inputs/Outputs > Frequency Output > FO Scaling

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.

1.

Set Frequency Output Scaling Method.

Frequency=Flow

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:

Factor to convert selected time base to seconds

Integrate the meter with the control system

111