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9
CArE & mAiNTENANCE
11. CARE & MAINTENANCE
• Never immerse the tester over the maximum immersion level.
• Fresh buffers should be used for each calibration. Once the sachets are opened the buffer value can change over time.
• If the electrode is slow or sluggish, soak it in cleaning solution for 20 minutes. Rinse with water and hydrate the
electrode in storage solution for a minimum of 30 minutes before calibrating.
• If measurements are taken successively, rinse the probe thoroughly in distilled or deionized water to eliminate
cross-contamination between measurements.
Refilling the Electrode
• To remove the electrode sleeve, carefully rotate and slide it off (A). Set it to one side.
Note: Handle the probe with care, the pH electrode stem is made of glass.
• Rinse off any traces of electrolyte gel from sleeve. Soak the electrode tip in HI70061
General purpose cleaning solution (or HI700661, HI700663, HI700664) for
20 minutes. Rinse with distilled or deionized water.
• Refill the reference well with HI9071 Gelled bridge electrolyte (B).
• Replace the sleeve. Ensure the o-ring is fixed inside the electrode. Rinse off excess
gel with distilled or deionized water.
• Shake the probe down gently to eliminate any trapped air bubbles.
• Soak the probe in HI70300 Electrode storage solution for a minimum of 30 minutes before calibrating.
Storage
To ensure a quick response, the glass tip and junction should be kept hydrated.
When not in use, add a few drops of storage solution to the storage cap. If storage solution is not available, pH 4.01 or
pH 7.01 buffer can be used.
Note: Do not store the electrode in distilled or deionized water.
12. WARNING & ERROR MESSAGES
----
WRNG
“---- WRNG” displayed during calibration.
Invalid buffer.
Check the buffer value and use fresh buffer.
12.02
23.7
Measured value displayed blinking.
Measured value is out of electrode range.
Clean the electrode to improve condition.
!
8.02
23.7
Battery icon (
!
) displayed blinking.
Battery is below 10 %, replace the battery.
BAtt
DEAD
“BAtt DEAD” and tester turns off.
Depleted battery, replace the battery.
13. ABBREVIATIONS
ATC Automatic Temperature Compensation
GLP Good Laboratory Practice
MTC Manual Temperature Compensation
NIST National Institute of Standards and Technology
A
B
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