Dynasonics Fusion Water Flow Meter - Manual (Page 17)

17
TOTAL PULSE OUTPUT
The FUSION is equipped with an open-collector transistor circuit
that outputs a 33 millisecond pulse each time the flow meter
totalizer display increments—i.e., one pulse for every gallon or
barrel. Adjustment of the Total Unit and Total Exponent
parameters influences the frequency of the total pulse output.
Figure 11 illustrates common wiring configurations of the Total
Pulse output feature. The output is a square-wave with a peak-to
-peak voltage that swings to the DC supply rail when the SW1-1
is ON or to an alternate voltage level if SW1-1 is turned OFF and
an external pull-up resistor and power source are utilized. The
output will remain in a “high” state and pulse low for 33 mSec
when the totalizer increments.
Total Pulse output examples,
Example 1: If the Total Unit is set to Gallons and the Total
Multiplier is set to E0 (1), the FUSION will output one pulse for
every gallon of liquid that passes through the meter.
Example 2: If the Total Unit is set to Gallons and the Total
Multiplier is set to E1 (10), the FUSION will output one pulse
for every ten gallons of liquid that passes through the meter.
Example 3: If the Total Unit is set to Barrels and the Total
Multiplier is set to E-1 (0.1), the FUSION will output one pulse
for every 0.1 barrels of liquid that passes through the meter.
Figure 11
Totalizer Pulse
Output