Probe filling Electrolyte
SPECIFICATIONS
Probe head with
Diaphragm set
Probe filling Electrolyte
Ranges: Dissolved Oxygen 0 to 20.0 mg/L (liter)
Resolution: Dissolved Oxygen 0.1 mg/L
Accuracy: Dissolved Oxygen ± 0.4 mg/L
Probe Compensation Temp: 0 to 50 °C, automatic
and Adjustment:
Sampling Time: approximately 0.4 seconds
Data Output: PC serial Interface
Case: ABS plastic
Fail safe: Low battery Indicator
Power: one (1) 9-Volt alkaline battery
Accessories
Supplied: carrying case, oxygen probe, spare
Oxygen hi Air 0 to 100.0% 0
Temperature 0 to 50°C
Oxygen 0.1% 0
Temperature 0.1°C
Oxygen ±0.7% 0
Temperature ±0.8°C, ±1.5°F
Salt: 0 to 39% Salt
Height 0 to 3900 meters
diaphragms (two), electrolyte for probe,
battery, Traceable® Certicate, instructions.
2
2
2
FIGURE 1
DESCRIPTION
4-1 LCD
4-2 Power on/ff Button
4-3 Data Hold Button: press to hold reading
4-4 °C/°F button
4-5 LCD contrast Adjustment Knob
4-6 Memory Record Button: press to record results.
4-7 Memory Recall Button: press to show minimum and
maximum readings.
4-8 Factor Adjustment Button
4-9 Zero Button
4-10 % Salt Button
4-11 DO/02 Button
4-12 02 Calibration Button
4.43 Mountain Height Button
4-14 Battery Compartment
4-15 Probe Input Socket
4-16 Computer Output Socket
4-17 Oxygen Probe
4-18 Temperature sensor
4-19 Probe head with diaphragm
4-20 Protection cover for probe head
4-21 Oxygen Probe Plug
DIGITAL OXYGEN METER OPERATION
1. This unit has been shipped with Electrolyte Liquid
in the sensor. This enables the probe to correctly
report oxygen. If calibrating the meter is difcult or if
the meter readings are unstable, then it is possible
that there is insufcient or no electrolyte in the
sensor. SEE REPLACING ELECTROLYTE on how
to ll the sensor.
2. Before use, the unit must be calibrated. Disconnect
the OXYGEN PROBE PLUG (4-18, g. 1) from the
socket on top of the unit labeled INPUT (4-15, g. 1).
3. Turn the meter on by switching the POWER
BUTTON (4-2, g. 1) to the right.
4. Select 02 by sliding the O2/DO selector (4-11, g. 1)
to this position.
5. Press the ZERO BUTTON (4-9, g. 1). The display
will show 0.
6. Connect the OXYGEN PROBE PLUG (4-18,
g. 1) to the socket on top of the unit labeled INPUT
(4-15, g. 1). Wait at least ve (5) minutes until the
displayed values stabilize and no longer uctuate.
7. Press the 02 CALIBRATION BUTTON (4-12, g. 1).
The display will show either 20.8 or 20.9, the typical
oxygen percentage in the air.
NOTE: Calibrate the meter In a large, well
ventilated environment for best results.
8. To measure Dissolved oxygen, slide the O2/DO
selector (4-11, g. 1) to the DO position.
9. Depending on your application, you may need to
adjust the % salt compensation of the probe. Press
% SALT BUTTON (4-10, g. 1). The Display will
show an “S” for salinity, and 0%. Press the FACTOR
ADJUSTMENT BUTTON (4-8, g. 1) once. This will
add 1% to the original salt %. Continue pressing
this button until it reaches the desired value. When
complete, press % SALT BUTTON (4-10, g. 1).
10. If your measurement is not taking place at sea level,
you will need to adjust the Height compensation.
Press the MT BUTTON (4-13, g. 1) The Display will
show an “H” for height and a 0 for zero sea level.
Press the FACTOR ADJUSTMENT BUTTON
(4-8, g. 1) once. This will add 100 meters. Continue
pressing this button until it reaches the desired
value. When complete, press MT BUTTON
(4-13, g. 1).
11. Immerse the probe at least 10 cm into the liquid
being measured. This ensures that the probe will
measure the temperature of the liquid and the
automatic temperature adjustment will take place.
Allow a few minutes for the probe temperature reach
the temperature of the liquid. If there is more than a
few degrees of difference between the temperature
of the liquid and the probe, allow more time for the
probe temperature to adapt.
12. To measure the dissolved oxygen content, the
velocity of the liquid being measured must be at
least 0.2-0.3 m/s. To achieve this, immerse the
probe in the solution and gently shake it. For a more
accurate measurement, use a magnetic agitator to
ensure a certain velocity. Indicate that the value is a
“held” value. To cancel the data hold feature, simply
press the HOLD BUTTON a second time.
13. After use, rinse the probe thoroughly with tap water.
DATA HOLD
To hold a measurement on the display, press the HOLD
BUTTON (4-3, g. 1) while a measurement is being
taken. The LCD will show DH in the upper left portion of
the display to indicate that the value is a “held” value.
To cancel the data hold feature, simply press the HOLD
BUTTON a second time.
DATA RECORD
1. To record a measurement, press the RECORD
BUTTON (4-6, g. 1) while a measurement is being
taken to hold the displayed value. The LCD will show
REC in the lower left portion of the display to indicate
that the value is being recorded. To deactivate the
record function, press the RECORD BUTTON again.
2. Memory Recall: Use the RECALL BUTTON
(4-7, g. 1) to recall the minimum, maximum and
average readings. When the REC symbol appears on
the display, press the RECALL BUTTON (3-6, g. 1)
once. The maximum recorded value will be displayed.
The letters “Max” will also appear on indicating that
this is the maximum or highest reading. A second
press of the RECALL BUTTON will display the
minimum reading. The letters “Min” will also appear
indicating that this is the minimum or lowest reading.
A third press of the RECALL BUTTON will display the
average reading. The letters “Avg” will also appear
indicating that this is the average reading. Note: The
Data Record function must be in use to utilize the
Memory recall features. Once the RECORD BUTTON
has been pressed a second time to deactivate the
data record function, the minimum, maximum and
values are no longer stored.
AUTOMATIC SHUT-OFF
The unit has an automatic shut off feature to prolong
battery life. If no button on the unit is pressed for ten
minutes, the unit will automatically shut off. To deactivate
this feature, press the RECORD BUTTON while a
measurement is being taken.
DISPLAY CONTRAST ADJUSTMENT
The Contrast of the LCD may need to be changed either
because of light conditions, battery voltage drop, or user
preferences. The LCD contrast can be adjusted using
the LCD CONTRAST ADJUSTMENT KNOB (4-5, g. 1).
Simply turn the knob to the left or right until the optimal
LCD contrast is obtained. If the display is lled with
“88888” when no reading is being taken, the contrast
needs to be adjusted. Turn the contrast knob to the left
until a single “0” appears.
RESETTING THE CPU SYSTEM
Certain incorrect operational procedures may disrupt the
meters CPU system. If the meter is not working properly,
the circuit may need to be reset. Set the DO/0
(4-11, g. 1). Turn off the meter by pressing the power
0
2
button (4-2, g. 1). Disconnect the probe from the meter.
Press the 0
continuously. While still pressing this button, press the
CALIBRATION BUTTON (4-12, g. 1)
2
switch to
2
power button again. Then press the zero button (4-9,
g. 1). Reconnect the probe and wait until the reading
stabilizes. Press the 0
g. 1) again. Turn the power off. Begin normal operating
CALIBRATION BUTTON (4-12,
2
procedures again.
FIGURE 2
Probe head with
Diaphragm set
REPLACING THE ELECTROLYTE
1. When the meter cannot be calibrated
properly or if the reading is unstable, the
electrolyte may need to be relled or the
diaphragm may be dirty and need to be
replaced. Unscrew the Probe Head
(8-3, g. 2)
2. Pour out the old electrolyte from the Probe Head
(8-3, g. 2).
3. Pour in the new Electrolyte into the container of the
probe head.
4. Reassemble the Probe Head (8-3, g. 2) with the Probe
Body (8-1, g. 2).
COMPUTER OUTPUT
This unit features computer output. A COMPUTER
OUTPUT SOCKET (4-10, g. 1) is located on the top of
the unit. To utilize this feature, connect the unit to a PC
with the Data Acquisition Accessory.
(SEE ACCESSORIES SECTION).
BATTERY LIFE
If the letters “LBT” appear on the left corner of the
display, it indicates the battery is low and needs to be
replaced. To replace the battery, slide the battery cover
located on the back of the unit away from the unit.
Remove the old battery and replace it with a new 9-Volt
alkaline battery. Use an alkaline battery, NOT a regular or
heavy duty battery. Properly connect the battery. Replace
the battery cover. Incorrectly installed batteries may
damage electronics.
ALL OPERATIONAL DIFFICULTIES
If this oxygen meter does not function properly for any
reason, please replace the battery with a new 9-Volt
alkaline batteries (see Low Battery section). Low battery
power can occasionally cause any number of “apparent”
operational difculties. Replacing the batteries with new
fresh batteries will solve most difculties.
TRACEABLE
DIGITAL
OXYGEN METER
INSTRUCTIONS
®
5 Commonwealth Ave
Woburn, MA 01801
TestEquipmentDepot.com
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