IOP 011C.3
Effective Date: 1/09/2017
Page 3 of 6
5. Twist the sensor clockwise to engage threads and finger tighten.
6. Replace the metal guard.
E. Sensor membrane installation maintenance.
1. Change membrane and oxygen probe electrolyte solution every 30 days.
2. Remove the metal sensor guard.
3. If installing a membrane for the first time, remove the protective cap or remove
the old membrane cap by unscrewing it with the probe upside down.
4. Examine the gold cathode at the tip of the sensor and silver anode along the
shaft of the sensor. If either the silver anode is black in color or the gold
cathode is dull (tarnished), the sensor needs maintenance or replacement. Refer
to the Pro20 Instruction Manual, GENERAL MAINTENANCE, of
polarographic sensor (Model # 605203).
5. Rinse the sensor with de-ionized water.
6. Fill a new membrane cap (5908 Kit - Yellow, 1.25 mil polyethylene) with
oxygen probe electrolyte Solution. Do not touch the membrane surface.
7. Tap the side of the membrane cap to release air bubbles.
8. Thread the membrane cap onto the sensor with the probe upside down.
9. Replace the metal sensor guard.
F. Storage of the DO probe.
1. Short term storage (30 days or less), slide probe into soft plastic
calibration/storage sleeve. Make sure there is a small amount of moisture (tap
water) on a sponge in the sleeve.
2. Long term storage, store sensor in a dry state.
a. Remove the membrane cap.
b. Thoroughly rinse the sensor with water.
c. Let sensor air dry, completely.
d. Use a clean dry membrane cap and screw over the sensor to keep it dry
and protected.
e. Store at -5 to 70C.
II. Pro20 Key Pad Functions.
A. Refer to the Pro20 Instruction Manual to setup meter configuration prior to initial use.
1. Backlight key (☼); after the unit is turned on, press the star key. The backlight
will remain on for 2 minutes unless the star key is pressed again.
2. Navigation; the up ▲ and down ▼ arrow keys allow you to navigate the
highlighted box at the bottom of the display. In the Menu, the arrow keys will
also move the highlight bar up and down.
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