Model GLI-9143 Portable D.O. Meter
4
Rev. 0-401
SPECIFICATIONS
Range
D.O.
% Sat.
Temp.
0.00 to 45.00 ppm
0.0 to 300.0%
0.0 to 50.0°C
Resolution
D.O.
% Sat.
Temp.
0.01 ppm
0.1%
0.1°C
Accuracy
D.O.
(@25°C/77°F) % Sat.
Temp.
± 1.5% full scale ppm
± 1.5% full scale %
± 0.5°C
Typical EMC
D.O.
Deviation
% Sat.
Temp.
± 0.3 ppm
± 3.5%
± 0.5°C
Calibration
Automatic in saturated air
Temp. Compensation
Automatic from 0 to 50°C
(32 to 122
°
F)
Altitude Compensation
0-13,123 ft. (0-4000 m) in
328 ft. (100 m) increments
Salinity Compensation
0-80 g/l in 1 g/l increments
Operating Conditions
From 0 to 50
°
C (32 to
122
°
F); 100% relative
humidity
Power Requirement
Four 1.5 volt AA alkaline
type batteries; 200 hours
continuous use; auto shut-
off after 4 hours of non-
use; power socket for 12
VDC adapter
Dimensions
7.7 x 3.1 x 2.4 inches
(196 x 80 x 60 mm)
Weight
15 oz. (425 g)
PROBE PREPARATION
All probes are shipped dry. To hydrate the
probe and prepare it for use, connect it to the
meter and proceed as follows:
1.
Remove the red and black
plastic shipping cap which can
be discarded.
2
Wet the sensor by soaking the
bottom 2½ cm (1 inch) of the
probe in electrolyte (GLI-7041S) for 5
minutes.
3
Take a membrane cap (GLI-76407A/P
supplied with the meter) and make sure
that the rubber O-ring sits properly inside
the membrane cap.
4
Rinse the mem-
brane cap with
electrolyte while
shaking it gently.
Refill with clean
electrolyte.
5
Gently tap the
sides of the mem-
brane cap with
your finger tip to
ensure that no air
bubbles remain
trapped. To avoid
damaging the membrane, do not tap the
membrane cap directly on the bottom.
6
With the sensor facing down, screw the
membrane cap clockwise. Some elec-
trolyte will over-flow.
When not in use, protect the mem-
brane by placing the protective cap
on it.
CALIBRATION
PROBE POLARIZATION
The probe is under polarization with a fixed
voltage of approximately 800 mV. Probe po-
larization is essential for stable meas-
urements with the same recurring degree of
accuracy.
With the probe properly polarized, oxygen is
continually "consumed" by passing through
the sensitive membrane and dissolving in the
electrolyte solution contained inside the
probe. If this operation is interrupted, the
electrolyte solution continues to be enriched
with oxygen until it reaches equilibrium with
the surrounding solution. Whenever meas-
urements are taken with a non-polarized
probe, the oxygen level indicated is that of
the test solution as well as any oxygen pres-
ent in the electrolyte solution. This reading is
obviously incorrect. The GLI meter automati-
