Ph Sensor Calibration; Inline Calibration - Maytronics pH Drive i Series Instruction Manual

pH Sensor Calibration

The pH Drive will display a reminder to
calibrate the pH Sensor approximately every
12 months:
The pH Sensor should be calibrated to ensure
that the readout is correct. Calibration is
simply the process of placing the pH Sensor
into a solution of known pH, and adjusting
the readout to that value.
The pH Drive can be calibrated in one of two
ways:

1. Inline Calibration

This is done by obtaining an accurate pH
measurement of the pool water and
adjusting the readout to that value.
2. pH7.0 Buffer Calibration
This involves removing the pH Sensor
from the pH Tee, placing it into a pH7.0
Buffer solution, and adjusting the readout
to 7.0.
Inline Calibration
1. Measure the pH of the Pool
Set the pH Drive to Standby or 24Hr Delay
mode an hour or more before measuring
the pH of the pool. Do not change back to
Auto Control mode until af ter pH
calibration is completed.
Ensure that the pool filtration pump has
been running and no acid has been added
for at least 1 hour prior to doing an Inline
Calibration. This is to ensure that the pH
level is stable throughout the whole pool.
Measure the pH of the pool with a good
quality, calibrated pH meter. Alternatively,
take a sample of pool water to a pool shop
which has an electronic pool balance
measurement system. A standard pool pH
test kit is NOT accurate enough to be
relied upon for pH calibration.
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2. Calibration Procedure
! Press Setup to enter the user-friendly
menu system, then press ‡ and ˆ until
Calibrate pH Sensor is selected.
! Press Enter to go to the Calibration screen.
The current reading is displayed in
brackets. The flashing "X" indicates that
the reading is not yet stable. DO NOT
calibrate until the "X" changes to a "ü"
! Press ‡ and ˆ to set the "Cal:" pH value to
the pH of the pool, as measured in step 1.
! Press Enter to calibrate the pH Sensor, or
press Cancel to quit without calibrating.
! Set the pH Drive back to Auto Control
mode.
Calibration Failure
If pH calibration fails, the pH Drive will display
this message:
! C l e a n t h e p H S e n s o r a s p e r t h e
troubleshooting sec tion, then retr y
calibration.
! If the calibration failure persists, the pH
Sensor will most likely need to be replaced.
pH7.0 Buffer Calibration is on the next page.