1.3 How it works
The Bluelab pH Controller continually monitors and controls the pH level of a solution.
It utilises a separate probe for temperature and pH to accurately measure changes in your
solution, and has a built-in 120ml per minute peristaltic pump.
1.4 Terms (Glossary)
Displayed pH
The current pH measured by the pH probe.
Required pH
The target pH the Bluelab pH Controller will maintain when in Control mode.
Dosing cycles
Automated control of pH is achieved by dosing. The Bluelab pH Controller does this
with a dosing cycle method that consists of an OnTime and an OffTime.
OnTime
The time that the pump runs for in each dosing cycle. As a guide, three dosing cycles
should change the reservoir by 0.1 pH points.
IMPORTANT
If the OnTime is too short, it is possible that the Bluelab pH Controller won’t be
able to dose enough to keep up with the changing pH levels, even if it doses
every dosing cycle.
If the OnTime is too long, the value is likely to overshoot; i.e. a single dose
changes the value so much it goes over the desired value.
OffTime
The delay time between each dose (or OnTime). This gives the system time to mix the
stock solution into the reservoir thoroughly, so the Bluelab pH Controller measures
the solution accurately. Start with a longer OffTime and reduce it over time.
IMPORTANT
If the OffTime is too short, the pH stock solution will not have been properly
mixed in the reservoir. The Bluelab pH Controller may dose again, which can
result in overshoot of the required value.
If the OffTime is too long, it is possible that the pH levels may change too much
between doses.
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