EUTECH INSTRUMENTS WATERPROOF CYBERSCAN PD 300 PHDISSOLVED OXYGEN METER, Instruction Manual, Page: 54 / 66

50
5. Using the installation tool, unscrew and remove
the membrane lock from the membrane cap.
See Figure 42.
6. Remove the membrane and O-ring. Discard
both.
7. Rinse the membrane cap and membrane lock in
tap water.
8. Install a new O-ring inside the membrane cap.
9. Install a new membrane. Make sure the
membrane covers the O-ring all around its
circumference. See Figure 43.
10. Using the installation tool, screw the membrane
lock back into the cap. Tighten the lock firmly
over the membrane and O-ring, but do not
overtighten.
11. Inspect the membrane for wrinkles. If wrinkles
exist, remove the membrane and repeat steps 8
– 11.
12. Fill the membrane cap with water and inspect
the bottom for leaks. If water drops are leaking
from the membrane, re-seal the membrane on
the O-ring (repeat steps 8 – 11).
13. If the assembly is leak-free, empty the water
and fill the membrane cap with electrolyte to the
brim.
14. Screw the cap onto the probe. Excess
electrolyte will drain out.
15. Replace probe guard.
16. Calibrate the probe (see section 4) after the %
saturation readings have stabilized.
NOTE: Membrane can only be used once. When a
membrane cap is screwed onto the probe, the membrane is stretched by the cathode. If the
same O-ring and the membrane is used a second time it will not fit perfectly onto the cathode.
This will result is erratic readings.
Figure 42: Use Tool to take
out (or put in) membrane
Figure 43: Positioning of O-
ring & membrane