Nova-Tech pH-Dissolved Oxygen Meter - Manual (Page 30)

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DO Membrane Replacement
Replacement of the 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.
To order replacement probe components or a
replacement probe, see the “Accessories” section
on page 64.
To replace the probe membrane:
1. Pull off the probe guard.
2. Unscrew the membrane cap from the probe.
3. Hold the probe under a water tap and brush
away the white oxide on the cylindrical anode
with a stiff plastic brush—do not use metal
cleaning material.
4. It the cathode has any deposits, remove them
with a light scouring powder. Do not polish
the cathode.
NOTE: If you have purchased a replacement
membrane module with preinstalled
membrane, skip to step 12.
CONTINUED ON NEXT PAGE
Temperature
sensor
Anode
Membrane
lock
Membrane
O-ring
Membrane
cap
Probe
guard
Cathode
9.3
A
Installation tool
Carefully place
O-ring, then
membrane,
into membrane
cap.
Insert notches
on installation
tool into slots on
membrane lock.
Then, unscrew
membrane
lock from
membrane cap.
B
C
B
C
5. Using the installation tool, unscrew and
remove the membrane lock from the
membrane cap.
See figure
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
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-seat 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 4.4-4.6 on
pages 14-18) after the % saturation readings
have stabilized.
http://www.novatech-usa.com/Products/Laboratory-Equipment-Supply-Products Tel: (281) 359-8538 Toll Free:(866) 433-6682