Hach-Lange ISENH318103 User Manual - Manual (Page 10)

6. Select Acceptance Criteria and update the settings:
Option Description
Acceptance Limits Sets the tolerance limits for check standard—1% to 20%.
Cal Expires on Failure Recalibration required if check standard fails—Yes or No.
The calibration expires if the check standard fails and Cal Expires is
set to Yes.
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 sensing
element or improper storage conditions.
• Slow response time occurs as a result of contamination on the sensing element.
• The slope is out of range as a result of contamination on the sensing element.
For general contaminants, complete the following steps.
1. Rinse the probe with deionized water. Blot dry with a lint-free cloth. Do not touch the
tip of the probe.
2. If harsh contaminants are attached to the probe, polish the probe tip with a soft cloth
or cotton swab to remove the contaminants.
3. Soak for 30 seconds in 25 mL of Ammonia probe storage solution.
Storage
Short-term storage
For short-term storage, put the probe with the attached membrane module in 25 mL of
Ammonia probe storage solution. Do not let the membrane dry out. A soaker bottle is not
required.
Overnight and mid-term (up to one week) storage
1. Put the Ammonia probe with the attached membrane module in 1000 mg/L Ammonia
standard solution without Ionic Strength Adjustor (ISA). Do not let the membrane dry
out. A soaker bottle is not required.
2. Put a cover over the storage beaker and probe body to prevent solution evaporation.
Long-term (more than one week) storage
1. Remove the Ammonia membrane module from the probe body.
2. Rinse the probe and membrane module with deionized water. Blot dry with a lint-free
cloth. Do not touch the tip of the probe. Do not rub the membrane surface.
3. Install the protector cap over the membrane module and put the Ammonia membrane
module in a protected area. The disassembled membrane module can be allowed to
dry.
4. Fill the probe soaker bottle halfway with Ammonia probe storage solution.
5. Install the probe soaker bottle. Make sure the storage solution in the cap completely
surrounds the glass bulb.
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