US and Canada 800.683.2378, International 904.641.1666
S Series FW 3.02.02
51
CONTROL MODES MENU
continued
PPM FEED – VARIABLE FLOW, HALL EFFECT
page 4 of 6
The Variable Flow, Hall Effect option is used with process systems with a variable flow. The pump
accepts a hall effect input from a flow meter (typically, a paddlewheel or turbine type meter).
Program the pump with the:
• Meter K factor
• Process minimum and maximum flow rate (GPM or LPM selected in the
Units
submenu of
Configuration
)
• Chemical concentration %
• Specific gravity of the chemical
• Desired PPM dosing rate of the chemical
The pump uses the following equations to calculate the required speed:
• In GPD
Pump Output Required (GPD)
=
Process GPM × Feed Rate PPM X 1440
Chemical Concentration % × 10,000 × Specific Gravity
Pump Speed (%)
=
Pump Output Required (GPD) × 100
Max Pump Flow (GPD)
• In LPD
Pump Output Required (LPD)
=
Process LPM × Feed Rate PPM X 1440
Chemical Concentration % × 10,000 × Specific Gravity
Pump Speed (%)
=
Pump Output Required (LPD) × 100
Max Pump Flow (LPD)
