Thermo Fisher Scientific ECDOTPII-S Submersible Galvanic Dissolved Oxygen Sensor - Manual (Page 4)

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9. Fill the lower body to its rim with fresh Electrolyte as shown in FIG. 9.
10. Inspect the large O-Ring between the upper and lower body. Replace it if it appears
deteriorated. See FIG. 10.
11. Screw the lower body onto the upper body. Excess Electrolyte will squirt out of a small pressure
balance hole atop the upper body. If no electrolyte squirts out, clear the hole of its blockage
before installing the lower body.