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PROBE CONDITIONING & MAINTENANCE
6. PROBE CONDITIONING & MAINTENANCE
6.1. pH PROBE (HI829113)
• Remove the protective cap. Do not be alarmed if salt deposits are present, this is normal. Rinse the
probe with water.
• Shake the electrode down 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 a minimum
of 30 minutes. Rinse with water.
• Calibrate before using.
• When the electrode is not in use, add a few drops of HI70300 storage solution to the protective cap
and replace the cap. To ensure a quick response, the glass bulb and the junction should be kept
moist and not allowed to dry out.
Note: Never store the electrode in distilled or deionized water.
6.2. DO PROBE (HI764103)
The HI764103 is shipped dry. To hydrate the probe and prepare it for use:
• Remove the black & red plastic cap. This cap is used for shipping purposes only and can be thrown
away.
• Insert the O-ring in the membrane.
• Rinse the supplied membrane (HI76409A) with electrolyte while shaking it gently. Refill with clean
electrolyte.
• Gently tap the membrane over a surface to ensure that no air bubbles remain trapped. To avoid
damaging the membrane, do not touch it with your fingers.
• With the sensor facing down, screw the cap clockwise to the end of the threads. Some electrolyte
will overflow.
The same procedure is used to replace the electrolyte monthly and membrane every 2 months.
6.3. EC PROBE (HI763093)
Rinse the probe with clean water after measurements. If more cleaning is required, remove the probe
sleeve and clean the probe with a cloth or a nonabrasive detergent. Make sure to reinsert the sleeve
onto the probe properly and in the right direction. After cleaning the probe, recalibrate the instrument.
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