Frequency Output; Status Screens; Primary Flow - GF U3000 V2 Betriebsanleitung

User Manual
6.2.3

Frequency output

The output frequency is proportional to the flow rate or power within a specified frequency range of 0 – 200Hz. With the exception
of the Measurement Source being Signal, it only makes sense to measure derivative quantities such as Power and Flow. In these
cases, the instantaneous frequency is directly proportional to the instantaneous flow or power.
Both the lower and upper frequency as well as the values they represent can be set in the Freq Output screen. It is usual to set
the frequency range to the default of 0 and 200Hz. At 0Hz, the associated output switch is closed continuously. The lowest longest
waveform period is 60 second, hence the lowest non-zero frequency that can be generated is 1/60 = 0.01667 Hz. The precision of
the generated frequency averages ± 1%.
Generally, 0Hz represents zero flow or zero power, so the only selection that needs to be made is the maximum flow or power to
be accommodated at 200Hz
As mentioned in the previous section on Alarm Mode, the value of Signal can only be zero (no signal) or 1 (signal present). This
could be used to generate an audible alarm if the signal is lost. To do this, set the lower frequency to be 100Hz and lower value to
be 0 and the upper value to be 1 at a frequency of 0Hz. This will cause the output to be steady when a signal is present and to be
100Hz when signal is lost.
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Status screens

7.1

Primary flow

The Primary Flow screen summarises the flow totals and provides options for their display on the Flow Reading screen. To view
the Primary Flow screen:
Damping Time and Damping Mode are duplicates of the setting found in the System menu.
Signal-loss Timeout: Once a signal has been acquired, it is deemed to have been lost when the power and SNR ratio are insufficient
for longer than the Signal Loss Time-out setting.
Flow Direction allows you to reverse the sensor direction assignments. Changing flow direction may result in a small difference in
the magnitude of the reading observed.
1. From the Main menu, use the Up and Down scroll keys to
select Setup Instrument. Press the ENTER Key. The Options
screen is displayed.
2. Use the Up and Down scroll keys to select
Primary Flow.. Press the ENTER Key. The
Primary Flow screen is displayed.
The screen displays the forward and reverse flow totals: Fwd Total
and Rev Total.
To change the display of forward and reverse totals on the Flow
Reading screen, select Display Total. The options are: Both, None,
Fwd Total and Rev Total.
Status screens
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