Micro Motion RFT9709 Manual de instrucciones Pagina 124

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110
Using ProLink
®
Software with Micro Motion
®
Transmitters
Configure Menu: Transmitter Outputs
continued
Frequency/pulse output
Table 10-1. RFT9739 Frequency/pulse variables and output
Frequency/pulse output
scaling
Use the Frequency and Rate text boxes to scale the frequency/pulse
output:
If the output indicates flow rate, enter a frequency and a flow rate.
See Example 1, below. Use the units of measure that were
configured in
Chapter 9
, indicated by the labels next to the text
boxes. (To change the units of measure, see
Section 9.2
, page 93.)
If the output indicates flow total, enter the number of pulses you wish
to indicate a certain mass or flow. See Example 2, below. (RFT9739
software versions 3.0 through 3.5 do not support flow total over the
frequency/pulse output.)
Variable Frequency/pulse output
Mass Flow A frequency proportional to the mass flow rate
Mass Total* A given number of pulses per mass flow unit
Volume Flow A frequency proportional to the volume flow rate
Volume Total* A given number of pulses per volume flow unit
*Not available with RFT9739 software versions 3.0-3.5.
Example 1:
Scaling the frequency output to indicate mass flow rate:
Given:
The RFT9739 frequency/pulse output represents mass flow.
The RFT9739 maximum frequency output is 10 kHz.
Problem:
Scale the frequency output so that 4000 Hz represents a
mass flow rate of 400 grams per minute (g/min).
Solution:
Enter a value of 4000 into the Frequency text box.
Enter a value of 400 into the Rate text box.
Since 4000/400 = 10, the frequency is 10 times as large as the
proportional flow rate. Therefore, 1 Hz represents a mass flow rate of
0.10 g/min. The maximum output of 10,000 Hz represents a flow rate of
1000 g/min or 1 kg/min.
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