horiba LAQUA 2000 Series, Instruction Manual

Page: 85 / 108

Maintenance and Storage
67
● Daily storage of pH and ORP electrodes
If the electrode becomes dry, the response will be slow. Store in a moist atmosphere. Follow
the steps below to properly store the electrode:
1. Wash the electrode well with pure water (or deionized water) to remove sample
completely, and close the internal solution filler port.
2. Wash the inside of the protective cap with pure water (or deionized water), then add
enough pure water (or deionized water) to soak the sponge.
3. Attach the protective cap.
• When the electrode will not be used for a long period, store it by following the electrode
storage procedure detailed above.
• For long-term storage of pH and ORP electrodes, replace the reference electrode internal
solution with new solution once every 3 to 6 months.
● Daily storage of Ion Electrodes
For the detailed procedures for maintaining and storing electrodes, refer to the instruction
manual for each electrode. While the electrode is stored, the concentration of the reference
internal solution (outer tube) may change. For this reason, replace the reference internal
solution (outer tube) with a dropper or similar tool about once a week to once a month. For
conditioning the ion electrodes, refer to the table below:
For long-term storage of ion electrode, remove the electrode tip and put the rubber cap. Put the
protective cap on the electrode. Be sure to keep the protective cap dry. Store both the
electrode tip and the electrode in a dry place. Before reuse, condition the electrode.
Ion Conditioning Solution
Ammonia (NH
3
)
Soak the electrode (with membrane cap attached) in a beaker containing
filling solution for at least 15 minutes.
Calcium (Ca
2+
)
Soak in 100mg/L (or higher) standard with or without ISA for at least 1 hr.
Chloride (Cl
-
)
Soak in 100mg/L (or higher) standard with or without ISA for at least 1 hr.
Fluoride (F
-
)
Soak the electrode in 100mg/L or higher without TISAB for at least 1 hr.
Nitrate (NO
3
-
)
Soak in 100mg/L (or higher) standard with or without ISA for at least 1 hr.
Potassium (K
+
)
Soak in 100mg/L (or higher) standard with or without ISA for at least 1 hr.
Note
Note