Mixing Time
How long it takes from adding the pH solution until the pH reading becomes stable.
Mixing times (and therefore the OffTime) can be reduced by installing mixing pumps,
air injection or other mechanical means of mixing into the reservoir. The mixing time
of the reservoir can be estimated by manually adding sufficient nutrient to
significantly shift the pH value, while timing how long it takes from adding the pH
solution, to when the pH reading becomes stable.
Dosing lockouts
Some conditions will cause the Bluelab pH Controller to stop controlling. These are
called dosing lockouts. The three types of Dosing lockouts are Measurement range
limits, Alarms, and Ineffective control lockout (each explained below).
Measurement range limits
Both of the measurement types (pH and temperature) have a measurement range
within which they can measure. pH for example, can be measured between 0.0 pH and
14.0 pH; temperature between 0 °C and 50 °C.
If values outside these limits are detected, the pH Controller will indicate that it is
under or over range by flashing the display and displaying “ur” or “or” in the affected
measurement type. Dosing will immediately stop.
Alarms
When alarms are turned on, and the Bluelab pH Controller senses that either pH is
beyond the set high or low alarm values, pH dosing will stop.
IMPORTANT
Alarms are not just warnings that values have shifted away from the required
value - they stop dosing. Be careful not to set alarm values which are too close to
the required values, as they may result in the Bluelab pH Controller going into
alarm because of small variations in measured values.
When the values return to within the limits of the set alarms, the alarm state
ceases, and after a 60 second countdown, the Bluelab pH Controller begins
controlling again, dosing as required. The alarm state can also be cancelled by
switching alarms off (via alarm in the menu or switching alarms off via Edenic).
After a 60 second countdown the Bluelab pH Controller will begin controlling
again.
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