GLI International GLI-9143 Operating Manual

Manual No. 9143
Revision 0-401

MODEL GLI-9143

HAND-HELD/PORTABLE

DISSOLVED OXYGEN METER

Please read this instruction manual carefully
before using the instrument. This manual will
provide you with all the necessary information
for the correct use of the instrument, as well
as a precise idea of its versatility.

This meter is in compliance with European
Community (CE) directives EN 50081-1 and
EN 50082-1.

NOTE: Save all packing material until you

are sure that the instrument func­tions correctly. All defective items
must be returned in their original
packaging together with the supplied
accessories.

GENERAL DESCRIPTION

TABLE OF CONTENTS

PRELIMINARY EXAMINATION................................. 2

GENERAL DESCRIPTION..................................... 2-3

FUNCTIONAL DESCRIPTION -- PROBE .................. 3

FUNCTIONAL DESCRIPTION -- METER .................. 3

SPECIFICATIONS.....................................................4

PROBE PREPARATION ........................................... 4

CALIBRATION ....................................................... 4-5

MEASUREMENT ................................................... 5-6

ALTITUDE COMPENSATION....................................6

SALINITY COMPENSATION..................................... 6

PROBE AND MEMBRANE MAINTENANCE........... 6-7

BATTERY REPLACEMENT ......................................8

WARRANTY.............................................................. 8

PRELIMINARY EXAMINATION

The GLI-9143 is a water-resistant, micro­processor-based, auto-calibration Dissolved
Oxygen meter with automatic temperature
compensation (ATC).

It has been developed for dissolved oxygen
and temperature measurement in water and
wastewater as well as other applications such
as fish farming.

Dissolved oxygen is indicated in hundredths
of parts per million (ppm = mg/L) or in % of
saturation.

The temperature range is indicated in centi­grade from 0 to 50°C with 0.1°C resolution.

The ppm and the % saturation are both com­pensated for changes in solubility of oxygen
in water and for permeability of the mem­brane as well as the temperature effect.

Remove the instrument from the packing
material and examine it carefully to make
sure that no damage has occurred during
shipping. If there is any damage, notify the
transit carrier immediately.

Each meter is supplied complete with:

GLI-76407/4 Dissolved Oxygen Probe

•

with 13 ft. (4 m) cable or GLI-76407/10
Dissolved Oxygen Probe with 33 ft. (10 m)
cable

Spare membranes (two)

•

Protective cap

•

30 ml electrolyte solution

•

Instruction Manual

•

AA size Alkaline Batteries (four)

•

Rugged Carrying Case

•

Model GLI-9143 Portable D.O. Meter 2 Rev. 0-401

Salinity compensation in water allows deter­mination of mg/L of dissolved oxygen in salty
waters and the altitude compensation read­justs for the altitude variance.

Four 1.5V AA alkaline batteries provide
power and make the instrument completely
portable. The meter is also designed to be
used with a battery charger or a 12VDC
power supply. A 12VDC input jack is incorpo­rated into the housing.

A microprocessor ensures an accurate and
rapid calibration and measurement. The rug­ged meter case is water-resistant for
maximum protection in the field as well as in
the laboratory.

The dissolved oxygen probe has a mem­brane covering the polarographic sensor
elements and a built-in thermistor for tem­perature 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 cur­rent to flow from which the oxygen
concentration is determined.

FUNCTIONAL DESCRIPTION -- PROBE

1) D.O. Probe

2) Protective Cap

FUNCTIONAL DESCRIPTION -- METER

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

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

Rev. 0-401 3 Model GLI-9143 Portable D.O. Meter

20) SAMPLE indicator (to indicate the meas­urement mode)

21) F1 indicator (altitude factor)

22) F2 indicator (salinity factor)

23) % or ppm mode indicator

24) Temperature (and factor) display