Sample Measurement Procedure; Section 7 Verify The Calibration; Verification Procedure - Hach PHC108 User Manual

6.3 Sample measurement procedure

1. Rinse the probe
with deionized water.
Dry the probe with a
lint-free cloth.

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.
8 English
2. Put the probe in
the sample with the
sensor and
reference junction
fully in the sample.
2. Prepare or pour
the pH buffer
solution into a
beaker.
3. Shake the probe
from side to side to
refresh the reference
junction and remove
air bubbles.
Note: For homogenous
semi-solid samples,
shaking is not
necessary.
3. Rinse the probe
with deionized water.
Dry the probe with a
lint-free cloth.
4. Stir gently, then
read the pH value of
the sample. The
display shows the
temperature-
corrected pH value
when the reading is
stable.
Note: For homogenous
semi-solid samples,
stirring is not
necessary.
4. Put the probe in
the pH buffer
solution with the
sensor and
reference junction
fully in the solution.
Do not put the probe
on the bottom or
sides of the beaker.