Section 7 Verify The Calibration; Verification Procedure - Hach PHC745 User Manual

5. Shake the probe
from side to side to
refresh the reference
junction and remove
air bubbles.
Note: Be careful to not
hit the beaker and
damage the probe.

Section 7 Verify the calibration

Measure the pH value of a fresh pH buffer solution to make sure the result is accurate. The meter
compares the selected pH buffer value to the measured pH value and accepts or rejects the
measurement. The user can change the pH buffer solution and acceptance criteria for verification in
the probe-specific settings.
Note: Password protection may prevent access to the acceptance criteria.

7.1 Verification procedure

1. Go to the
verification menu.
The display shows
the pH buffer
solution to use for
verification.
Note: Menu name for
HQd meters: Run check
standard.
6. Stir gently, then
read the pH value of
the sample. The
display shows the
temperature-
compensated pH
value when the
reading is stable.
2. Prepare or pour
the pH buffer
solution into a
beaker.
3. Open the filling
hole.
4. Rinse the probe
with deionized water.
Dry the probe with a
lint-free cloth.
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