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The thin permeable membrane isolates the
sensor elements from the sample, but allows
oxygen to enter.
A voltage is applied across the sensor, and
the oxygen that has passed through the mem-
brane reacts causing the current to flow, hence
determining a reading.
A convenient feature of the instrument is its
standby mode which keeps the probe polarized
and ready for instant measurements.
FUNCTIONAL DESCRIPTION (PROBE)
1. D.O. Probe
2. Protective Cap
3. Watertight Shielded Cable
4. Probe Body
5. O-Ring Seal
6. Silver Chloride Anode
7. Platinum Cathode (sensor)
8. Oxygen Permeable Membrane
9. Membrane Cap
4
FUNCTIONAL DESCRIPTION (METER)
DO meter
3
2
STB
OFF
9
ZERO
SLOPE
1. Liquid Crystal Display
2. "OFF" (to switch the meter off)
3. "STB" (to switch the meter on and polarize
the probe. Use this standby position with-
out switching the meter off if you are
going to take further measurements)
4. "°C" Measurement
5. "O
" Measurement
2
6. ZERO Calibration Trimmer
7. SLOPE Calibration Trimmer
8. °C Calibration Trimmer
9. Rotary Switch
1
HI 8043
4
°C
O
2
5
6
7
°C
8
ins rum n s
5
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