Hach-Lange PHC20103 User Manual - Manual (Page 9)

5. Select Check Standard Reminder and update the settings:
Option Description
Reminder Repeat Sets the time interval for the check standard reminder—Off, 30 minutes, 2
h, 4 h, 8 h, 12 h or 24 h.
Allow Defer Allows the postponement of check standard reminders—Yes or No.
6. Select Acceptance Criteria and update the settings:
Option Description
Acceptance Limits Sets the tolerance limits for check standard—0.005pH to 1.000pH
(default 0.050 pH).
Cal Expires on Failure Recalibration required if check standard fails—Yes or No.
7. If prompted, enter a name for the new method settings. Additional changes made to the
settings of an existing method are automatically saved with the same method name.
8. Push EXIT until the meter returns to the measurement mode.
Maintenance
Clean the probe
Clean the probe when:
• Drifting/inaccurate readings occur as a result of contamination on the glass sensor or
the probe being left dry for extended periods of time.
• Slow stabilization time occurs as a result of contamination on the glass sensor.
• A calibration error occurs as a result of contamination on the glass sensor.
The type of contamination will determine the cleaning solution needed.
For general contaminants:
1. Rinse the probe with deionized water and blot dry with a lint-free cloth.
2. Soak the glass bulb for 12 to 16 hours in Hach Electrode Cleaning Solution.
3. Rinse or soak the probe for 1 minute in deionized water.
4. Soak the probe in pH 4 buffer for up to 20 minutes, then rinse with deionized water.
5. Blot dry with a lint-free cloth.
For mineral deposits:
1. Rinse the probe with deionized water and blot dry with a lint-free cloth.
2. Soak the glass bulb for 10 to 15 minutes in 0.1 M HCl.
3. Rinse or soak the probe for one minute in deionized water.
4. Soak the probe in pH 4 buffer for up to 20 minutes. Rinse with deionized water.
5. Blot dry with a lint-free cloth.
For fats, grease and oils:
1. Soak the glass bulb in a warm detergent solution for up to 2 hours.
2. Rinse or soak the probe for 1 minute in deionized water.
3. Soak the probe in pH 4 buffer for up to 20 minutes, then rinse with deionized water.
4. Blot dry with a lint-free cloth.
Storage
Short-term and long-term storage
For the best probe performance, do not let the reference junction become dry.
1. Rinse the probe with deionized water. Dry the probe with a lint-free cloth.
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