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Apex Classic Setup and Programming Guide v2.2
Page
33
NOTE: Do not let the tip of the pH probe dry out as damage to the probe will
result. If you are not using your pH probe for an extended period of time, make
sure the tip is submerged in Probe Storage solution at all times. If storage
solution is not available, tap water can be used (RODI water should not be used).
To enable pH probes:
Apex Display: Setup – pH Setup – pH Enable – If you have more than one
pH port on your system, use the up/down arrow keys to choose the port
you wish to configure, press Select, then use the up/down arrow keys to
select on/off for that port, press Save when done or Exit to discard
changes.
Web Interface: This option is not available from the Web Interface.
NOTE: To configure the pH/ORP port on an Apex Base Module to be used for pH,
simply set pH2 ON in the pH Enable menu. Similarly, to configure the pH/ORP
port on a Probe Expansion or Probe Module to be used for a pH probe, simply set
pHA, pHB, pHx3, pHx4, etc to the ON setting in the pH Enable menu.
The Apex system pH probes can be configured to automatically adjust the pH to
compensate for changes in tank temperature. To enable/disable this feature:
Apex Display: Setup – pH Setup – Temp Comp: Off – Press Select to
toggle temperature compensation on and off.
Web Interface: This option is not available from the Web Interface.
NOTE: If temperature compensation is to be used on Probe Expansion or Probe
Modules, a temperature probe must be connected and enabled on that module.
PH PROBE CALIBRATION
pH probes need to be calibrated to perform properly. The following procedure
should be repeated periodically to keep your pH reading accurate as pH probes
tend to drift out of calibration over time. As the pH probe ages, it will drift out of
calibration very quickly or may not be capable of being calibrated at all. If this
occurs, it will be necessary to replace the pH probe.
NOTE: If you wish to use the automatic temperature compensation feature, you
should enable it before calibrating your pH probes. In this case, it is important for
the calibration solution to be at the same temperature as the temperature probe
at calibration time.