Hach-Lange PHC20103 User Manual - Manual (Page 5)

Run a check standard
The run check standard feature validates instrument performance between sample
measurements. Use the run check standard feature for periodic or user-defined interval
measurements of a traceable standard solution. Set the criteria for check standards from
the PHC201 Settings menu.
Note: Access control must be off or a valid password must be entered before any of the check standard
method options can be changed.
1. Push . The Full Access Options menu is shown.
2. Select Run Check Standard.
Note: Select the correct probe if two probes are connected to the meter.
3. Get the standard solution shown on the display.
4. Rinse the probe with deionized water. Blot dry with a lint-free cloth.
5. Put the probe in the standard solution until the temperature sensor is completely
submerged. Move the probe up or down or gently shake the probe to remove air
bubbles.
6. Push Read. The display will show "Stabilizing" and a progress bar as the reading
stabilizes. The display shows the value of the check standard and either Check
Standard Passed or Check Standard Failed.
7. If the display shows Check Standard Passed, the check standard measurement is
within the accepted limits set by the administrative user. Select Done to continue with
the sample measurement.
8. If the display shows Check Standard Failed, the measurement is outside of accepted
limits set by the administrative user and a recalibration is recommended. 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 recalibrated. To correct the probe
calibration and status indicator, calibrate the probe (refer to
Calibration on page 2).
Advanced operation
Parameter-specific settings can be changed through the Full Access Options menu. Details
about menu navigation, available options and how to change them are given in the screens,
tables and procedures throughout this section.
The settings that can be changed are shown in
Table 1 .
Table 1 Parameter-specific settings
Setting Options
Measurement Options
• Resolution
• Upper and lower range limits
Calibration Options
• Buffer set
• Buffer set values (if Custom Buffer Set selected)
• Reminder
• Minimum Cal points
• Slope limit
Check Standard Options
• Standard (temperature compensated buffer or custom at 25 °C)
• Reminder
• Acceptance criteria
• Standard value at 25 °C (if custom standard selected)
Units
• pH
• mV
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