CiDRA SONARtrac HD VF-100 - Manual (Page 81)

Copyright © 2006 CiDRA Corporation Page 10-6
20638-02 Rev 01
Figure 63 Flow Rate and Flow Rate % Pulse Output
‘Total Flow’ (or Totalizer) will output a number of pulses based upon
the total gallons (or flow units) counted during the previous update
interval (i.e. the display update time is defaulted to 2 seconds). In
effect, the Total Flow measurement is a pulse counter, updated at the
same time as the display.
Figure 64 Total Flow Pulse Output
The following is an example of Pulse settings applied to Flow Rate:
Output: Flow Rate
(Default setting, based on 8” schedule 40 pipe)
Min Flow: 513.575 gal/m
Max Flow: 5135.751 gal/m
Pulse Output: Flow Rate
Multiplier: 100
Pulse Width: 1 ms
Low cutoff: 0% or 513.5 gal/m (no cutoff)
Min Pulses: 5.136 Pulses per second
Max Pulses: 51.357 Pulses per second
In the above example, the Pulse output frequency indicates the flow
rate in gallons per minute, divided by 100. The output will therefore
vary between 5.136 and 51.357 PPS (Hz), based on the Flow Rate
reading.
Total Flow (Totalizer)
Time (Update Rate = 2 sec)
0 2 4 6
(1500 gpm /10) / (60s/2s) = 5 (3000 gpm /10) / (60s/2s) =10 (900 gpm /10) / (60s/2s) = 3
Multiplier = 10
Flow Rate
Time (sec)
500 gpm / 100 = 5 Hz 1000 gpm / 100 = 10 Hz 300 gpm / 100 = 3 Hz
Multiplier = 100
0 2 4 6
Pulse Width Varies
Pulse Width