24
PROBE MODE
Preparation
Pour small quantities of the buffer solutions into clean beakers. If possible, use plastic beakers to
minimize any EMC interferences. For accurate calibration and to minimize cross‑contamination, use
two beakers for each buffer solution: one for rinsing the electrode and one for calibration. If you are
measuring in the acidic range, use pH 7.01 or 6.86 as the first buffer and pH 4.01 as the second
buffer. If you are measuring in the alkaline range, use pH 7.01 or 6.86 as the first buffer and
pH 10.01 or 9.18 as the second buffer.
Procedure
Calibration can be performed using one or two calibration buffers. For more accurate
measurements, a two‑point calibration is recommended.
Submerse the pH electrode approximately 3 cm (1¼”) into a buffer solution and stir gently. From
the Probe Measurement screen, press the
Calibrate
key to begin the calibration process.
When the reading is stable and close to the selected buffer, the
Confirm
key will become available.
Press
Confirm
to accept and store the calibration point.
The meter will now prompt for the second buffer (“Buffer: 2”). To use only a one‑point calibration,
press
to exit calibration mode at this time. The meter will store the calibration information
to the probe and return to Measurement mode. To continue calibrating with a second buffer, rinse
and submerse the pH electrode approximately 3 cm (1¼”) into the second buffer solution and stir
gently. If necessary, press
keys to select a different buffer value.
When the reading is stable and close to the selected buffer, the
Confirm
key will become available.
Press
Confirm
to accept and store the second calibration point.
The meter will store the two‑point calibration information to the probe and return to Measurement
mode. The list of calibrated buffers will appear at the bottom of the screen.