Hach-Lange MTC10130 - Manual (Page 11)

6. Select Acceptance Criteria and update the settings:
Option Description
Acceptance Limits Sets the tolerance limits for check standard—-±1 mV to 25 mV
(default: ±10 mV).
Cal Expires on Failure Recalibration required if check standard fails—Yes or No (default).
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 or slow stabilization time occurs as a result of
contamination on the platinum disc or the probe being left dry for extended periods of
time.
• Measurement values are outside the calibration/measurement range of the probe
even after a calibration is done using freshly prepared standards.
Note: After cleaning is done, condition the platinum electrode in representative sample before use.
For general cleaning (including oils, greases and organics):
1. Rinse the probe with deionized water and blot dry with a lint-free cloth.
2. Put the probe sensor and platinum disc in Electrode Cleaning Solution or warm
detergent solution for up to 15 minutes.
Note: The platinum disc can be polished using a soft cloth or cotton swab with detergent
solution.
3. Rinse the probe sensor and platinum disc with deionized water. Blot dry with a lint-
free cloth.
For inorganic deposits:
1. Put the platinum disc in a solution of 0.1 M hydrochloric or nitric acid solution for up to
15 minutes.
2. Rinse the probe sensor and platinum disc with deionized water. Blot dry with a lint-
free cloth.
Remove the shroud
1. Loosen and remove the locking ring.
2. Slide the shroud and locking ring off the probe.
Install the shroud
1. Put the locking ring on the probe with the threads toward the probe.
2. Slide the shroud on the probe until it is against the locking groove.
3. Hand-tighten the locking ring on the shroud.
Storage
Short-term and long-term storage
For the best probe performance, do not let the reference junction dry out.
1. Rinse the probe with deionized water. Dry the probe with a lint-free cloth.
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