Hanna Instruments HI9829 - APPENDIX A - PROBE MAINTENANCE; General Maintenance; pH and pH;ORP Sensor Maintenance

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The HI7698292 probe maintenance kit includes HI7042S (electrolyte solution for D.O. sensor), spare
membranes with O‑Rings for D.O. sensor, a small brush for cleaning EC , O‑Rings for sensor connectors,
6 g sachet with silicone grease to lubricate the O‑Rings and syringe.
General Maintenance
• Inspect all sensor connectors for corrosion and replace sensors if necessary.
• Inspect sensor O‑Rings for nicks or other damage and replace sensor if necessary. Lubricate only with
grease from kit.
Use only the supplied grease as some lubricants can cause the O‑Rings to expand or affect
the turbidity calibration standards.
• After prolonged storage or cleaning, calibration of the sensors is required.
• After use rinse the probe with tap water and dry it. The pH electrode bulb must be kept moist. Dry
the D.O., EC and EC/Turbidity sensors. Dry ISE sensors and return to their storage caps if they will
not be used for a period of time.
• Check GLP data under “Status” to ensure the sensor is still functioning properly.
pH and pH/ORP Sensor Maintenance
• Remove the sensor protective cap. Do not be alarmed if any salt deposits are present. This is normal
with pH/ORP electrodes and they will disappear when rinsed with water.
• Shake down the sensor as you would do with a clinical thermometer to eliminate any air bubbles
inside the glass bulb.
• If the bulb and/or junction are dry, soak the electrode in HI70300 storage solution for at least one
hour.
• To ensure a quick response time, the glass bulb and the junction should be kept moist and not
allowed to dry. Store the sensor with a few drops of HI70300 storage solution or pH 4.01 buffer
in the protective cap. Tap water may also be used for a very short period (few days).
NEVER USE DISTILLED OR DEIONIZED WATER TO STORE PH SENSORS!
• Inspect the sensor for scratches or cracks. If any scratches or cracks are present, replace the sensor.
• Cleaning procedure: clean the sensor frequently by soaking it for 1 minute in HI70670 or HI70671
cleaning solution. After cleaning soak the sensor in HI70300 storage solution before taking
measurements.
APPENDIX A - PROBE MAINTENANCE