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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 and a syringe with grease to lubricate these O‑Rings.
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. and EC sensors.
• 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 are present, replace the sensor.
APPENDIX A - PROBE MAINTENANCE
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