Hanna Instruments HALO 2 Instruction Manual

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9CArE & mAiNTENANCE10. 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 theelectrode 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 eliminatecross-contamination between measurements.StorageTo ensure a quick response, the glass tip and junction should be kept hydrated.1. When not in use, add a few drops of storage solution to the storage cap. If storage solution is not available, pH 4.01or pH 7.01 buffer can be used.Note: Do not store the electrode in distilled or deionized water.2. Place the probe tip into the cap and gently tighten the collar.11. WARNING & ERROR MESSAGES----WRNG“---- WRNG” displayed during calibration.Invalid buffer.Check the buffer value and use fresh buffer.12.0223.7Measured value displayed blinking.Measured value is out of electrode range.Clean the electrode to improve condition.! 8.0223.7Battery icon (!) displayed blinking.Battery is below 10 %, replace the battery.BAttDEAD“BAtt DEAD” and tester turns off.Depleted battery, replace the battery.12. ABBREVIATIONSATC Automatic Temperature CompensationGLP Good Laboratory PracticeMTC Manual Temperature CompensationNIST National Institute of Standards and Technology

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