DO700-en-GB_v2.3 3/15
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P4 - Temperature unit of measure selection
Use the CAL or the M+/RM keys to select the desired unit of measure (
o
C or
o
F).
Momentarily press MODE to move to the next parameter or press ENTER to return to the
normal measurement mode.
P5 - Display Backlight Setting
Use the CAL or the M+/RM keys to select 0, 1, 3, or 6 minute default backlighting time.
Momentarily press MODE to move to the next parameter or press ENTER to return to the
normal measurement mode.
P6 - Automatic Power OFF Setting
Use the CAL or the M+/RM keys to select a 0, 10, or 20 minute Auto Power OFF time.
Momentarily press MODE to move to the next parameter or press ENTER to return to the
normal measurement mode.
Note: The default setting for DO is 0, that is, the auto power off function is defeated.
P7 - Restore Factory Default Settings
Use the CAL or the M+/RM keys to select ON (reset the factory default settings) or OFF
(cancel edit).
Momentarily press MODE to move to the first parameter (P1) or press ENTER to return to
the normal measurement mode.
Replacing the Membrane Cap
Replace the Membrane cap under the following conditions:
Electrode response time increases.
Displayed value appears incorrect or abnormal.
Damaged or cracked membrane.
Replace as follows:
1. Loosen and then remove the membrane cap.
2. Clean the electrode (without membrane cap) with distilled water and shake the water off
of the electrode.
3. Lightly polish the cathode surface (gold) with a piece of clear velvet or tissue.
4. Slowly inject electrolyte into a new membrane cap. After injecting, check the electrolyte
for air bubbles. If air bubbles are present, carefully tap the membrane cap to remove the
air pockets.
5. Place the membrane cap on a clean surface and place the electrode in the cap
vertically. Slowly twist in a clockwise motion until electrode is tightly attached. Excess
electrolyte may be displaced, wipe excess electrolyte with tissue and distilled water.
6. Check that there are no air bubbles present in the electrolyte (smaller air bubbles are
acceptable). If large air bubbles are present, re-assembly will be required.
7. Do not touch the sensitive membrane when using the electrode or replacing the
membrane cap. Oils from the skin will affect the quality of the membrane and decrease
the rate of oxygen permeability.
