MANUALPC-2010 CHAPTER IV - OPERATION Page 42
6.4 - Flow Rate
This line displays the flow rate through the main recirculation
line using input from the square wave pulse sensor. To
calibrate the flow sensor, press the RIGHT ARROW key to
enter Submenu 6.4.
The flow sensor is calibrated by entering the K-factor provided
by the sensor manufacturer. These values correspond to the
number of pulses per unit of volume in gallons or liters, which
are given by the sensor manufacturer.
The values shown in the two tables below are for ideal
conditions according to ASTM-D-1785. K-factors provided by
the sensor manufacturer should be used when available.
These K values however are accurate only under ideal flow
conditions that are rarely met in practice (see Chapter II -
Installation).
For best results, the flowmeter should be calibrated by one of
the following methods, listed in order of decreasing accuracy:
1. Measurement with ultrasonic flow meter,
2. Calculation from pump manufacturer curve and pressure
differential before and after the pump,
3. Hydrodynamic calculations from engineering design.
It should be noted that the readings can vary with actual flow
conditions in the pipe.
If further adjustments are needed, note that higher K values
correspond to lower flow rates.
6.5 - Flow Total
L
ine number 5 in the Pump Menu shows the cumulative flow
since last reset to zero or since the last backwash.
To reset the cumulative flow counter, press the RIGHT
ARROW key. This will automatically reset the counter to 0.
Submenu 6.4
SCHEDULE 80
DIAM (in.)
K-FACTOR
U.S. GA
K-FACTOR
LITERS
1.5 175.394 46.339
2.0 105.032 27.749
2.5 74.093 19.576
3.0 47.411 12.526
3.5 35.482 9.374
4.0 27.289 7.210
5.0 17.113 4.521
6.0 11.932 3.152
8.0 6.795 1.795
10.0 4.164 1.100
12.0 2.854 0.754
Schedule 80 Factors
SCHEDULE 40
DIAM (in.)
K-FACTOR
U.S. GA
K-FACTOR
LITERS
1.5 151.145 39.933
2.0 89.666 23.690
2.5 65.054 17.187
3.0 42.703 11.282
3.5 31.661 8.365
4.0 24.387 6.443
5.0 15.463 4.085
6.0 10.692 2.825
8.0 6.095 1.610
10.0 3.726 0.984
12.0 2.571 0.679
Schedule 40 Factors
Enter number of
pulses per unit
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