Rev. 0-401
3
Model GLI-9143 Portable D.O. Meter
The dissolved oxygen probe has a mem-
brane covering the polarographic sensor
elements and a built-in thermistor for tem-
perature measurement and compensation.
The thin permeable membrane isolates the
sensor elements from the testing solution, but
allows oxygen to enter. When a voltage is
applied across the sensor, oxygen that
passes through the membrane causes a cur-
rent to flow from which the oxygen
concentration is determined.
FUNCTIONAL DESCRIPTION -- PROBE
1) D.O.
Probe
2) Protective
Cap
3) Watertight Shielded Cable
4) Polypropylene Probe Body
5) Temperature
Sensor
6) O-ring
Seal
7) Silver Chloride Anode (sensor element)
8) Platinum Cathode (sensor element)
9) Oxygen-permeable Teflon Membrane
10) Protective Cap
FUNCTIONAL DESCRIPTION -- METER
1)
Battery compartment
2)
Probe connector
3)
Liquid crystal display
4)
ON/OFF button
5)
CAL button (to enter or exit calibration
mode)
6)
FACTOR button (to select altitude F1
and salinity F2)
7)
UP and DOWN arrow keys (to select F1
and F2 levels)
8)
HOLD key (to freeze displayed value)
9)
RANGE button (to select ppm or % of
saturation)
10) Power jack for 12VDC adapter
19) LOW BAT indicator
20) SAMPLE indicator (to indicate the meas-
urement mode)
21) F1 indicator (altitude factor)
22) F2 indicator (salinity factor)
23) % or ppm mode indicator
24) Temperature (and factor) display
