Demand Dosing - Agrowtek GrowControl GC-Pro Operation Manual

Automatic (Demand Based) Dosing
If your GrowControl system is equipped with hydroponics sensors, (pH, conductivity and water temperature) the controller can
maintain the nutrient concentration automatically. The automatic nutrient dosing works like many other commercial dosing
systems available today and is a very simple, reliable process.
The controller monitors the conductivity, or concentration, of the nutrient solution. When the concentration is below the set
points, the dosing process will be initiated. Each pump will deliver the dose in milliliters as set in each part. The process will
then repeat with the dwell time between each cycle until the nutrient level reaches the set-point.
Enable
Auto Dosing
Conductivity
Reading
Auto Dose Mode
All or Parts 1 & 2 only
Pump Flow Rate
(system units)
Dose Pump
Output #
Delay After
Parts Mode
Part Delay
Seconds
Cycle Dwell
Seconds
Day/Night EC (or TDS): The desired conductivity (or TDS) for the controller to maintain during the day and night periods.
Note: to disable dosing during day or night set the value to 0.
Deadband: The EC (or ppm) drop to allow before starting a dosing cycle (see below.)
Cancel Output #: Output to cancel when batch dosing is active. Use this to prevent feed pumps from operating when dosing.
Set to disable the cancel output when dosing is active in batch mode only, or either batch mode or auto mode.
Notes:
1. The cycle dwell time can be set to 0 for continuous dosing cycles.
2. The part delay time can be set to 0.
3. The dose parts can be multiplied by a factor to achieve larger doses per cycle and the reservoir/batch size divided by
the same factor to batch dose proper amounts.
Dead-Band
The "Dead-band" determines how much of a nutrient drop is allowed
before re-dosing back up to the set point.
Example: Controller doses up to 1000ppm; dead-band = 100ppm.
When ppm falls below 900, controller will dose back up to 1000.
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Parts 1 - 8
mL/Gal Day & Night Values
Auto Nutrient Dose Control
Start Dose Cycle
If Nutrient Concentration is Low
Calculate Length of Time to run each Dosing Pump
Injects amounts for a single gallon of water each cycle.
Run Dose Pump Output
Last
Part
Delay
1 & 2
After
Only
ALL
Separation Delay Timer
Cycle Dwell Timer
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Set-Points Dead Band
Hysteresis Setting
Else
Part #
1 or 2
Set Point
Dosing
Cancel
Output #
Cancel in
"Auto & Batch"
If Dosing
Mode
is Active
Enabled
Disable Output
(feed pump, etc.)
Nutrient Concentration
On
Off
Dosing Cycles
Dead
Band