Maintenance; Clean Ec Probe; Calibrating The Ec Probe; Cleaning The Ph Electrode - Autogrow IntelliDose Installation And User Manual

IntelliDose Manual
Section H – Software installation
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Section I – Maintenance

Clean EC probe

Remove shroud from end of probe. Clean the face of the probe, use a little kitchen
liquid scouring cleaner such as "Jif" or "SoftScrub" on a clean "Scotchbrite" nylon
scouring pad. Alternatively, use 600 grit wet-and-dry paper with the cleanser. Use a
circular motion to scour the face of the probe and then rinse well in running water.
Do not touch the face of the probe but shake off any residual water..
Replace the shroud and check calibration.

Calibrating the EC probe

After cleaning and rinsing the probe, shake vigorously to remove any surplus water.
Now place the probe in EC standard solution and allow the temperature
compensation to take full effect by leaving for 5 minutes or more. Calibration
o
solutions are usually 2.76mS/cm referenced to 25 C but any calibration solution may
be used.
The reading should settle to within 0.1 EC (1 CF or 5ppm) of the value stated on the
bottle. If not then navigate to the EC calibration screen on the controller (not
available on IntelliGrow) and press the up/down arrows until the reading exactly
matches the value printed on the bottle. Note that calibration solutions are easily
contaminated or changed by evaporation and should be replaced with fresh solutions
every 3 months or more frequently if high accuracy is required.

Cleaning the pH electrode

The pH electrode is supplied with a protective cap or cover over its active
end. Its purpose is to keep the glass bulb moist during storage and transit.
This cover must be removed before use.
The glass bulb at the end of the pH electrode should be shiny and clear. If not then
it may be cleaned by brushing with a soft toothbrush or special cleaning tool
together with a little liquid scourer such as Jif or Soft Scrub. Do this very carefully as
the glass bulb is extremely delicate. Rinse thoroughly with clean water.
Calibrating the pH electrode
Every week you should check the pH calibration. To do this place the probe in the
pH7 buffer solution and allow to stand for 10 minutes. The reading should be 7.0 +/-
0.1 pH. If not then navigate to the pH 7 calibration screen and use the up/down
arrows to correct the displayed reading. When correct, press save.
Next rinse the probe in fresh water and shake off excess water. Now place in the
pH 4 buffer solution and allow to stand for 10 minutes. The reading should be 4.0
+/-0.1. If not navigate to the pH 4 calibration screen and use the up/down arrows to
correct. Now press save to store the calibration.
IMPORTANT: The pH 7 calibration MUST be carried out before the pH 4
calibration.
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