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Operation
Calculating On and Off Times for Batch Treatment
1. Set your pump for continuous operation and max
flow rate (see your related pump manual).
2. Identify the max flow rate for your pump depending
on the plunger size:
a. Approximate method:
•
Look up the max flow rate of your pump
using the following table. This table only
applies to Graco pumps and assumes the
pump is running at full speed (60 RPM) and
maximum stroke adjustment.
Fluid Plunger
Diameter
(Full Stroke)
3/16"
1/4"
3/8"
1/2"
5/8"
3/4"
Calculation and Conversion Example
•
5 gallon batch desired with a 1/4" pump and a batch once every 7 days. Enter the bold time values below in
Setup Modes on page 7.
Calculating On Time
1. Max flow rate of pump = 18.4 GPD
2. On Time = Gallons Desired (Gal) / Max Flow Rate
(GPD) = 5 / 18.4 = 0.27 days
3. Convert On Time to enter in the controller in Days,
Hours, Minutes, and Seconds:
8
Max Flow
Rate
(GPD)
10.3
18.4
33.0
62.4
103.3
148.7
b. Calibration method:
•
Run a one-minute continuous flow cycle on
your chemical tank's calibration column
(see your related pump manual for detailed
chemical dosage instructions).
•
Read the volume pumped on your chemical
tank's calibration column. This is your max
flow rate (see your related pump manual for
detailed chemical dosage instructions).
•
Convert the measured value to a gallon per
day (GPD) measurement, if necessary.
3. Calculate the On Time in days.
4. Convert the On Time to days, hours, minutes, and
seconds to enter in the Harrier EZ-B controller.
5. Calculate the Off Time in days.
6. Convert the Off Time to days, hours, minutes, and
seconds and enter in the Harrier EZ-B controller
(see Setup Modes on page 7).
Calculating Off Time
1. Off Time = Desired Batch Interval - On Time = 7
days - 0.27 days = 6.73 days
2. Convert Off Time to enter in the controller in Days,
Hours, Minutes, and Seconds:
3A8606A
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