Hanna Instruments HI520 - Measuring with Galvanic DO Probes; Probe Preparation & Conditioning

Measuring with Galvanic Dissolved Oxygen (DO) Probes 138
23. MEASURING WITH GALVANIC DISSOLVED OXYGEN (DO) PROBES
23.1. PROBE PREPARATION & CONDITIONING
• Probes from Hanna Instruments
®
are shipped dry.
• Remove the red and black shipping cap before use.
•
The membrane cap and the electrolyte reservoir need to be filled with HI7042B galvanic DO electrolyte
solution prior to the first use.
See section 23.6.2 Membrane Cap & Electrolyte Replacement recommendations.
Fill hole
Electrolyte screw
Fill hole o-ring
Shipping cap
O-ring
O-ring position
Membrane cap
Electrolyte (re)filling Procedure
1. Unscrew and remove the electrolyte screw and O‑ring located on the side of probe body (see figure). Set
aside.
2. Open the membrane package and remove one O‑ring and one membrane cap.
3. Slide the O‑ring onto the anode and over the cap’s threads to rest flush against the probe body.
4. Rinse the new membrane cap with some electrolyte and discard.
5. Attach supplied (with probe, probes sold separately) cone‑shaped tip to the syringe.
6. Draw up a full syringe by pulling back on the plunger.
7. Dispense some of the electrolyte to fill half of the membrane cap with solution.
8. Tap the cap to release any trapped air bubbles. Allow bubbles to rise to the surface.
9.
Point the probe downwards and screw on the cap, forcing electrolyte into reservoir and allowing remaining
trapped air to escape through the electrolyte screw hole. Tighten the membrane cap so that it sits flush
with the probe body.
10. Hold the probe sideways (slightly downwards) and use the syringe to fill up the reservoir with remaining
amount of electrolyte solution. Draw and and then dispense more liquid until excess electrolyte flows out
allowing trapped air to escape.
The probe holds approximately 7 mL of electrolyte.
11. Replace the fill hole O‑ring and tighten the screw in position.
12. Firmly tap the probe sides to ensure no trapped bubbles inside the cap.
13. Keep the probe in water for a few hours to acclimate.
14. Calibrate before installation.