Thermo Fisher Scientific CyberScan DO 110 - Manual (Page 51)

Instruction Manual CyberScan DO 110
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10.3 Membrane Housing Replacement
Replacement of the membrane cap housing/ membrane is
required only when you cannot calibrate the probe, or if the
membrane is damaged.
Typical membrane damages are punctures or wrinkles caused
during measurements or cleaning.
Your new DO probe comes with replacement membrane
housing. To order more replacement membrane housing, see
the “Accessories” section page.
10.3.1 To replace the membrane cap (with pre-installed
membrane) -
1. Replacement is much easier with single membrane
housing. Unscrew the old membrane cap housing.
2. Hold the probe under hot running water and brush away
the white oxide on the cylindrical anode with a stiff
plastic brush – do not use metal cleaning material.
3. If the cathode has any deposits, remove them with a
light scouring powder. Do not polish the cathode.
4. Fill the new membrane cap housing with electrolyte
solution and inspect the bottom for leaks. If the solution
drops are leaking from the membrane, use new cap
housing.
5. If the assembly is leak-free, fill the membrane cap housing with electrolyte to
the brim.
6. Tap the side of the housing gently to remove any air bubble that may be
sticking to the membrane.
7. Screw the cap onto the probe. Excess electrolyte will drain out.
8. Replace probe guard.
9. Calibrate the probe (see section 4) after the % saturation readings have
stabilised.
Figure 33: Positioning
of O-ring & membrane