Run check standard, Advanced operation – Hach-Lange PHC745 User Manual
Page 7
6. Do steps 3–5
again to make more
measurements.
7. When
measurements are
done, put the probe in
storage (refer to
on page 12).
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 PHC805 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.
5. Put the probe in the standard solution. Make sure that the reference junction is fully in
the standard. Move the probe up or down or lightly shake the probe to remove air
bubbles.
6. Push Read. The display shows "Stabilizing" and a progress bar as the reading
stabilizes. The display shows the value of the check standard and Check Standard
Passed or Check Standard Failed.
7. If the display shows Check Standard Passed, the check standard measurement is in
the accepted limits. Select Done to continue the sample measurement.
8. If the display shows Check Standard Failed, the measurement is out of the accepted
limits. A calibration is recommended. Make sure that the limits are set correctly at the
PHC805 Settings menu. If the acceptance criteria is set to "Cal Expires on Failure:
Yes", the display shows the calibration icon and a question mark until the probe is
calibrated again. To correct the probe calibration and status indicator, calibrate the
probe (refer to
Advanced operation
This section gives instructions about menu navigation and available options. Change
parameter-specific settings through the Full Access Options menu.
The settings that can be changed are shown in
7