2.5.5 On times
ime can be set from one second to ten minutes in one second intervals.
During dosing on time, the dose direction indicators next to the Actual values will
flash.
For information on calculating on times for multi part nutrients see Bluelab PeriPod
manual.
1. Select ‘on times’
mode.
2. Select measurement
to adjust ( ‘’ ).
3. Press (or hold down)
the ‘Value Increase /
Decrease’ buttons to
change the on time
value.
Programmable from 0-10
mintues in one second
increments.
®
dose until the required value is reached WITHOUT stopping to allow the tank to mix.
This should be used under special circumstances, as unless closely monitored,
overshooting is likely.
The ideal on time is the time that the doser has to dose for (pumps actually
running), in order to shift the EC by just less than 0.1 EC. Any more than 0.1EC,
and the EC can overshoot, as one dose may take it over the required value. Any less
will increase the time the system needs to dose up to the required levels. If time to
reach the required EC level is not very important (recirculating systems change
slowly, and can be corrected slowly) a shorter on time (maybe 2 or three doses to
lift the EC by 0.1) is fine.
The on time for pH will be quite different to EC, so will need to be found in the same
way, but shifting 0.1 pH instead.
Slowly add equal parts of the nutrient that will be used in small
quantities and wait for it to mix. Keep adding small quantities like this,
waiting for it to mix each time, until the EC reading just increases to the
next 0.1 step.
Now, measuring exactly how much you are adding, add small equal
quantities of nutrient, again waiting for it to mix after each addition, until
the EC reading just reaches the next 0.1 step.
The amount of nutrient added to reach the second step from the first is
the amount needed to shift the EC by 0.1.
mode
selected
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