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10
SIZING IN GALLONS
continued
1.
Calculate the
Available Dose Time in Seconds.
The Available Dose Time is the minimum time interval between water meter contact
closures. Each closure sends an input signal to the PCM.
a. 60
=
Maximum System Flow Rate (gpm)
Maximum System Flow Rate (spg)
b. Maximum System Flow Rate (spg)
Water Meter’s contacts per gallon (cpg
)*
=
Available Dose Time (sec.)
*
Refer to the water meter model number to confirm the contact rate (cpg).
2.
Calculate the
PCM Operating Time in Seconds.
Calculate the PCM Operating Time based on pump selection in D, solution and dosage
in B and use the formula below.
Pump Output Requirement (gpd) x Available Dose Time (sec.)
=
PCM Operating
Pump’s Maximum Output (gpd)
Time (sec.)
PCM OPERATING TIME EXCEEDING AVAILABLE DOSE TIME
MAY LEAD TO DOSING ERRORS.
To reduce PCM Operating Time, select a pump with
a higher output or use stronger solution strength.
