Apex Classic Setup and Programming Guide v2.2 Page 42
3. Use the Up and Down buttons to select the calibration solution. Press
the select button when the correct value is displayed. See Table 2 -
Conductivity Range Options for the recommend calibration solution.
4. Place the Conductivity probe into the calibration solution. Wait for the
numbers on the bottom of the LCD screen to stop changing. When
the display stops changing press the select button.
5. The conductivity probe should now be properly calibrated.
NOTE: Many conductivity calibration solutions do not have the same ionic
composition as salt water so using a refractometer to measure the salinity
of the calibration solution is not valid. For example the Neptune 53.0
mS/cm conductivity calibration standard will not have a salinity of 35 PPT
or a specific gravity of 1.0259.
Web Interface: This option is not available from the Web Interface.
CONDUCTIVITY PROBE MAINTENANCE
Conductivity probes should be periodically cleaned for best performance. The
period between cleanings is up to the user but typically every 1-3 months is
normal. To clean the probe, gently brush the sides and tip of the probe with a
soft brush to remove any debris. Rinse the probe in tap water. Soaking the probe
in acid (vinegar) or alkali (borax) solution to remove mineral deposits is not
typically needed but can be used to try and bring back an old probe that has
stopped working.
DISSOLVED OXYGEN SETUP (OPTIONAL)
A port to connect a Dissolved Oxygen probe is included on the optional expansion
Probe Module 3 (PM3). The Dissolved Oxygen probe will be identified as “DOx3”,
“DOx4”, etc. The number in the probe identifier corresponds to the AquaBus
number assigned to the PM3. If a temperature probe is connected to the PM3, it
is identified as “Tmpx3”, “Tmpx4”, etc. with the same AquaBus number as the
conductivity probe.
NOTE: The AquaController Apex firmware version must be at least version 4.03
to support the Probe Module 3.
The following precautions should be observed when installing the dissolved
oxygen probe:
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