Run check standard – Hach-Lange PHC108 User Manual
Page 5
•
For the best stabilization time, condition the probe for several minutes in the sample
or in a solution comparable to the sample in terms of pH and ionic strength before the
initial sample measurement.
•
Do not put the probe on the bottom or sides of the container.
•
Use a laboratory stirrer or shake the probe from side to side in the solution to refresh
the reference junction.
•
The meter display shows "Stabilizing" and a progress bar as the probe stabilizes in
the sample. The display shows the lock icon when the measurement is stable.
•
If a measurement error occurs, refer to
on page 10.
Measurement procedure:
1. Connect the probe
to the meter. Make
sure that the cable
locking nut is correctly
connected to the
meter. Set the meter
to on.
2. Condition the
probe in the sample.
3. Rinse the probe
with deionized water
and then with the
sample. Dry with a
no-lint cloth.
4. Put the probe in
the sample and stir
lightly. Make sure to
fully put the reference
junction into the
sample.
5. Push Read. Wait
until the reading
stabilizes.
6. Do steps 3–5
again to make more
measurements.
7. When
measurements are
done, put the probe in
storage (refer to
on page 10).
Run Check Standard
The Run Check Standard feature validates the instrument performance between sample
measurements. Use the Run Check Standard feature for a periodic or a user-defined
interval measurements of a traceable standard solution. Set the criteria for check
standards from the PHC108 Settings menu.
Note: Access control must be set to off or a valid password must be used to change the Run Check
Standard options.
1. Push . The Full Access Options menu shows.
2. Select Run Check Standard.
Note: Select the correct probe if two probes are connected to the meter.
3. Use the standard solution shown on the display.
4. Rinse the probe with deionized water. Dry the probe with a no-lint cloth.
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