Apex Classic Setup and Programming Guide v2.2
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37
AquaController Apex includes the ability to perform a 2 point calibration if
desired.
Special calibration solution must be made from standard pH 4.0 and 7.0
calibration solution by dissolving Quinhydrone powder in the solutions. Simply
dissolve Quinhydrone powder into the 4.0 and 7.0 solutions until the powder no
longer dissolves. Adding too much powder does not harm anything, it just wastes
the powder.
To calibrate an ORP probe:
1.
Create the ORP 4.0 and 7.0 solutions as described above.
2.
From the Apex Display, open the ORP calibration menu: Setup – ORP Setup
– ORP Calibrate.
3.
If you have more than one ORP probe enabled on your system, use the
up/down arrow keys to choose the probe you wish to calibrate, press Select
or OK.
4.
Remove the ORP probe to be calibrated from the tank, rinse it in tap water,
gently shake the excess water off the probe, and place the probe in the
7.0/Quinhydrone Calibration Solution. Periodically swirl the probe in the
solution to ensure an accurate reading. Ensure the probe is submerged in
calibration solution at all times.
5.
Wait for the 7.0/Quinhydrone reading to stop changing. This may take a
few minutes up to 5 minutes depending on the type and condition of ORP
probe being calibrated. The value of the reading while calibrating may not
match the value of the solution being used, this is normal. Once the
reading has stabilized, press Select or OK.
6.
Remove the pH probe from the 7.0/Quinhydrone Calibration Solution, rinse
it in tap water, gently shake the excess water off the probe, and place the
probe in the 4.0/Quinhydrone Calibration Solution. Periodically swirl the
probe in the solution to ensure an accurate reading. Ensure the probe is
submerged in calibration solution at all times.
7.
Wait for the high reading to stop changing. This may take a few minutes up
to 5 minutes depending on the type and condition of ORP probe being
calibrated. The value of the reading while calibrating may not match the
value of the solution being used, this is normal. Once the reading has
stabilized, press Select or OK.
8.
The Apex system will use the calibration measurements to calibrate the
ORP probe.
9.
The calibration fluid can be used to calibrate more than one probe however
the ORP calibration should be discarded after use as they will degrade over
time after opening.
