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• 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.
D.O. Sensor Maintenance (HI98194, HI98196 only)
For a top performance probe, it is recommended to replace the membrane every 2 months and the
electrolyte monthly.
Proceed as follows:
• Unscrew the membrane by turning it counterclockwise.
• Rinse a spare membrane with some electrolyte while shaking it gently. Refill
with clean electrolyte.
• Gently tap the cap over a surface to ensure that no air bubbles remain
trapped. Avoid touching the membrane.
• With the sensor facing down, completely screw the cap clockwise. Some electrolyte will overflow.
If any deposit scales the sensor, gently brush the sensor surface with the supplied brush, while
paying attention to not damage the plastic body. Do not use the brush on the membrane.
EC Sensor Maintenance (HI98195, HI98196 only)
• After every series of measurements, rinse the probe with tap water.
• If a more thorough cleaning is required, clean the sensor with the supplied brush or a non‑abrasive
detergent. Ensure that the two cylindrical holes in the sensor are free of foreign material.
APPENDIX A - PROBE MAINTENANCE
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