GENERAL OPERATIONS
13
y
Continue with probe conditioning (polarizing) function.
Fill
Tap
Screw
back on
Position
the O-ring
Probe Polarization
A new probe must be polarized before calibration.
y
Connect the probe and power on the meter
y
“DISSOLVED OXYGEN PROBE CONDITIONING” is displayed for about 60 seconds while
the DO probe is conditioned. If the probe was previously conditioned and remained
connected to the meter, press any key to enter measurement mode.
The DO probe is continuously polarized when connected to the meter. Polarization does
not need to be performed unless maintenance is performed or the probe is disconnected
from the meter.
The probe is polarized with a fixed voltage of approximately 800 mV between the cathode
and anode. Probe polarization is essential for stable measurements. With the probe
properly polarized, oxygen is continually consumed as it passes through the sensitive
diaphragm and dissolves in the electrolyte solution contained in the probe.
If polarization is interrupted, the electrolyte solution continues to be enriched with oxygen
until it reaches an equilibrium with the surrounding solution. Measurements taken with
a non-polarized probe are drifty and inaccurate. The measurement will jump when the
probe is moved.
Note:
When not in use and during polarization, use the protective cap.
