LaMotte Tracer PockeTester User manual

TRACERTM
DO PockeTester
Code 1761
FILL - Before first use
POLARIZE - Weekly
CALIBRATE - Daily
See Pages 9-12
Short Form Instructions
Fill the membrane cap assembly before the first use. Follow Set Up
instructions before the first use. Read the entire manual before the first use.
Calibrate daily. Polarize weekly.
Dissolved Oxygen Measurement Procedure
1. Press ON/OFF button to turn meter ON.
2. Place TRACER in sample. Stir.
3. Wait for reading to stabilize.
4. Record result.
5. Press ON/OFF to turn meter off.
6. Rinse electrode.
7. Replace electrode cap.
WARNING! This set contains chemicals
that may be harmful if misused. Read
cautions on individual containers care-
fully. Not to be used by children except
under adult supervision.
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Display 2000 count, Dual function 3 ½ digit LCD with Bar
graph
Display size 24 mm x 20 mm
Sensor Polarographic type
Membrane Bonded membrane cap with threaded fitting
Operating Temp. Range 0 to 50°C (32 to 122°F)
ATC Range 0 to 50°C (32 to 122°F)
Salinity Compensation 0 to 50 ppt in 1 ppt (part per thousand) increments
Altitude compensation 6000 m (0 to 20,000 ft) in 300m (1000 ft) increments
Measurement Storage 25 tagged (numbered) data sets with recall
Battery Power Four (4) CR2032 button batteries
Low Battery Indication ‘BAT’ appears on the LCD
Auto Power Off After 10 minutes of inactivity (APO override available)
Dimensions/Weight 36 x 173 x 41mm (1.4 x 6.8 x 1.6”); 110g (3.8 oz)
Measurement Range Resolution Accuracy
% Saturation 0 to 200.0% 0.1% ±2.0% FS (full scale)
Dissolved Oxygen 0 to 20.00 mg/l 0.01 mg/l ±2% FS
Concentration 0 to 20.00 ppm 0.01 ppm ±2% FS
Temperature 0 to 50 °C 0.1 °C ±1.0 °C
32 to 122°F 0.1 °F (0 to 99ºF);
1.0 °F (>100°F)
±1.8°F
CONTENTS
Dissolved Oxygen TRACER Kit, Code 1761
Includes: DO TRACER Body, DO Bonded Membrane Cap Assembly Electrolyte
Solution, Sample cup and Lanyard
PARTS & ACCESSORIES
DO Replacement Sensor Kit (sensor module, membrane cap assembly,
electrolyte solution) Code 1762
DO Membrane Cap Kit (6 membrane cap assemblies, electrolyte solution,
Polishing Strips) Code 1761M
DO Extension Cable, 1 meter (with probe guard and weight) Code 1763
DO Extension Cable, 5 meter (with probe guard and weight) Code 1764
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METER DESCRIPTION
Front Panel Description
1. Battery compartment cover
2. LCD Display
3. MODE button
4. CAL button
5. ON/OFF button
6. Electrode Retaining Collar
7. Dissolved Oxygen Sensor
8. Bonded membrane cap assembly
9. Membrane & cathode (Note: The Electrode storage cap is
not shown)
Display
1. Bar graph display
2. Measurement units
3. Main display
4. Low Battery indicator
5. Temperature display
6. Reading Hold indicator
7. Polarization indicator (meter off)
OPERATION
Filling the Electrode
The electrode is shipped dry and requires filling with the supplied
electrolyte
solution before the first use. The membrane should be in place and
does not need to be replaced. Follow the procedure on page 6 for filling the
membrane cap.
Powering the Tracer
The Tracer uses four (4) CR2032 Lithium Ion Batteries. Press the ON/OFF
button
to turn the meter on or off. If the batteries are weak, the ‘BAT’ indicator
will
appear on the display. The auto power off feature shuts the Tracer off
automatically
after approximately 10 minutes of inactivity. The auto power
off feature may be temporarily disabled for convenience or for extended
polarization time.
Startup Polarization Period
When the DO Tracer is powered up for the first time, the electrode requires
polarization. In order for this to occur a polarization period of approximately
three minutes must elapse before measurements can be made. After the
meter has been turned on, a special circuit in the meter will maintain a
very small biasing current to the electrode for a period of seven days. This
2t
5
10
710
20
12
mg/L
*
5
6
%
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will keep the electrode polarized and enables the user to make immediate
measurements within a 7 day period without waiting for the electrode to re-
polarize. Each time the Tracer is turned on, the polarization timer is reset and
the 7 day polarization period is initiated. A small asterisk at the bottom right
corner of the display will indicate that the polarization timer circuit is active
only when the meter is off. If the Tracer is not used for more than seven days, a
3 minute waiting period is required before a measurement can be made.
Turn-On Diagnostics
1. When the meter is turned on ‘SELF’ and ‘CAL’ will be displayed while the
meter runs a diagnostic routine.
2. During this time the meter is recalling the User Calibration data,
performing
self diagnostics & initializing the circuitry.
3. After this function is complete, the meter proceeds to the normal
measurement mode.
Changing the Temperature Units
To change the displayed temperature units between °F and °C
1. With the unit OFF, press and hold CAL.
2. With CAL depressed, momentarily press ON/OFF to turn the Tracer ON.
3. Release CAL. ‘SELF CAL’ will be displayed.
4. Repeat Steps 1 – 3 to change to the other temperature unit.
Changing the Salinity Compensation
1. With the Tracer ON, momentarily press CAL twice in quick succession. ‘SAL’
will be shown on the lower part of the display.
2. Momentary press MODE. Each press of MODE increases the salinity
compensation by 1ppt (part per thousand); the available range is 0 to
50ppt.
3. Momentarily press CAL to save the compensation setting and return to the
normal measurement mode.
Changing the Altitude Compensation
1. With the Tracer ON, momentarily press CAL twice in quick succession. ‘SAL’
will be shown in the lower part of the display.
2. Press and hold CAL again for 2 seconds to enter the Altitude Mode. ‘Ald’ will
be shown in the lower part of the display.
3. The factory default value is sea level. Each press of MODE increases
the altitude compensation by 1000ft. The maximum value is 20 presses
(20,000ft above sea level).
4. Momentarily press CAL to save the compensation setting and return to the
normal measurement mode.
Changing the Measurement Units
The meter can be set to measure % saturation, dissolved oxygen in mg/l, and
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dissolved oxygen in parts per million (ppm).
To change the mode:
1. Press and hold MODE for 2 seconds and the display will begin to scroll
through the available units of measure :
◊ % saturation
◊ dissolved oxygen, mg/L (milligrams per liter)
◊ dissolved oxygen, ppm (parts per million)
2. When the desired units are displayed, release MODE and the unit will return
to normal operating mode.
Note: The ‘HOLD’ function cannot be on when changing the measurement
function. If ‘HOLD’ is displayed in the lower left corner of the display, briefly
press the MODE button to turn it off.
Auto-Power Off Feature
The auto power off feature automatically shuts the meter off 10 minutes after
the most recent button press. To disable this feature, refer to the Disable Auto-
Power Off section.
Disable Auto-Power Off Feature
With the meter ON, momentarily press CAL, then quickly press and hold both
MODE and ON/OFF until ‘oFF’ is displayed. To restore the Auto Power Off
Feature turn the meter off and on again using ON/OFF.
Low Battery Indicator
When the battery voltage falls below the operating threshold, ‘BAT’ will appear
on the display. Refer to the Maintenance section for battery replacement
information.
Storing Readings
1. Press MODE to store a reading. The storage location number will be
shown
on the lower display and the main display will show the stored
reading.
The meter will enter the HOLD mode and ‘HOLD’ will appear on the
display.
2. Press MODE again to exit the HOLD mode and return to normal operation.
The next time MODE is momentarily pressed another reading will be
stored
and so on.
3. If more than 25 readings are stored, previously stored readings, starting
with reading number 1, will be overwritten.
Recalling Stored Readings
1. Momentarily press the CAL and then, within 4 seconds, momentarily
press
MODE. The last stored data point location will be displayed (1 to 25).
Each time MODE is momentarily pressed the next most recently stored
data point will be displayed.
2. After the last data point stored is displayed, press MODE again to return
the display to the beginning of the list.
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3. Press CAL at any time to stop the data retrieval process and return the
meter
to the normal measurement mode.
Clearing Stored Readings
1. With the meter ON press and hold ON/OFF for 4 seconds.
2. When ‘clr’ is shown on the display the memory is cleared.
SET UP
Membrane Cap Assembly - Filling and Replacement
The electrode is shipped dry and requires filling with the supplied electrolyte
solution before the first use. The membrane should be in place and does not
need to be replaced. Important Note: Do not touch the membrane as skin oils
will interfere with the oxygen permeability rate of the membrane.
1. The electrode should remain attached to the meter during the process.
2. Carefully remove the membrane cap assembly from the electrode by firmly
unscrewing it in a counter-clockwise direction.
3. Discard the used membrane cap assembly. NOTE: When a membrane
cap is installed the membrane must tightly stretch over the cathode. If a
membrane cap is removed, it can not be reinstalled because the membrane
will no longer stretch properly over the cathode.
4. Rinse the cathode and anode with deionized water.
5. Set the membrane cap assembly on a flat surface.
6. Fill the membrane cap
assembly with Electrolyte
Solution (DO600-EL) to the
bottom of the threads on the
inside of the cap. To remove air
bubbles hold the cap steady
with one hand and tap the side
of the assembly sharply with
a pen.
7. Do not move the membrane
cap assembly. Dip the
electrode into the assembly
and remove it. Repeat this
step several times. With each
dip, progressively push the
electrode deeper into the electrode solution in the assembly. This dipping
technique will minimize the introduction of air bubbles into the electrolyte
solution. Air bubbles can compromise dissolved oxygen measurements.
8. Carefully pick up the membrane cap assembly and slowly screw it onto the
electrode in a counter-clockwise direction until it is fully tightened. While
tightening the cap, excess electrolyte solution will leak out. This is normal
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and desirable since it will minimize air pockets in the solution. Air pockets
can compromise dissolved oxygen measurements. If the electrode solution
does not overflow, an insufficient amount was added. Repeat the process
with a new membrance cap assembly if air bubbles or air pockets are visible
when the meter is inverted. Membrane cap assemblies can not be reused.
NOTE: Air bubbles outside the cathode (6 mm in diameter in the center of
the probe) will not interfere.
9. Rinse excess electrolyte from the outside of the membrane cap assembly
and the electrode. The pH of the electrode filling solution in polargraphic
dissolved oxygen meters changes with time resulting in less accurate
results. It is recommended that the membrane and electrode filling
solution be changed every 2 - 4 weeks depending on usage. Because of the
configuration of the membrane and electrode, the membrane is stretched
by the cathode and cannot be reused. It must be replaced.
Polarization
If the meter has not been used for seven days or longer the electrode will not
be fully polarized. A fully polarized electrode is indicated by a small, flashing,
asterisk in the lower right corner of the display when the meter is OFF. If the
asterisk is absent, turn the meter ON and allow the electrode to fully polarize.
This may take 2-3 minutes. The asterisk will appear to indicate full polarization.
Calibration
Calibration should be performed daily. (Be sure the electrode is filled and fully
polarized before calibrating)
1. Turn the meter ON.
2. Press and hold MODE until ‘%’ is displayed.
3. Remove the electrode cap. The electrode membrane must be clean and dry
or the calibration will be incorrect. Do not touch the membrane. Skin oil will
affect the electrode response.
4. Moisten the sponge in the electrode cap with distilled water or tap water. Do
not soak the sponge.
5. Replace the electrode cap on the electrode. There must be an air gap
between the membrane and the sponge.
6. Wait until the reading stabilizes. Press and hold CAL until ‘CAL’ is shown on
the display. The readings will blink ‘101.7’ and ‘SA’ will appear. ‘SA’ will not
appear if the calibration fails.
7. When the calibration is complete ‘End’ will appear and the meter will return
to the measurement mode.
Optional Zero Oxygen Calibration
The zero oxygen calibration will improve the measurement accuracy for very
low or very high dissolved oxygen samples.
1. Place the electrode in a zero dissolved oxygen calibration solution, such as
5% sodium sulfite.
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2. Slowly stir the sample with the electrode and wait for the reading to
stabilize. This may take a while, depending on the electrode history.
3. Press CAL until ‘CAL’ is shown on the display. The readings will blink ‘101.7’
and ‘SA’ will appear. ‘SA’ will not appear if the calibration fails.
4. When the calibration is complete ‘End’ will appear and the meter will return
to the measurement mode. NOTE: Sodium Sulfite can become deposited
on the electrode and on the coined surface of the electrode retaining collar.
The presence of the Sodium Sulfite will negatively affect dissolved oxygen
measurements unless it is removed completelyfrom the electrode.
DISSOLVED OXYGEN MEASUREMENT
(Be sure the electrode is filled and fully polarized. Calibrate daily.)
1. Cover the electrode with the electrode cap. The sponge in the electrode cap
should be moistened (not soaked) with distilled water or tap water.
2. Press ON/OFF to turn the meter ON. The meter will self calibrate.
3. Press and hold MODE to select the desired unit of measure.
4. Remove the electrode cap.
5. Place the electrode in the sample to be measured. Stir the sample with the
electrode.
6. Wait for the reading to stabilize.
7. Press ON/OFF to turn the meter OFF. Rinse the electrode with distilled
water or tap water. Replace the electrode cap.
NOTE: The unit of measure selected when the meter was last turned OFF will
be retained. Stir the sample with the electrode to remove any air bubbles that
may be trapped on the membrane surface and to obtain accurate results. Do
not submerse the electrode above the bottom edge of the electrode collar.
For maximum accuracy, allow sufficient time for the temperature of the probe
to reach the temperature of the sample before taking a reading. The larger
the difference in temperature between the electrode and the sample the
longer it will take for the reading to stabilize. Stabilization will be indicated by
a stable temperature reading on the display. Stabilization time can vary from
10 seconds to 5 minutes. The DO Tracer uses a polarographic sensor, which
consumes oxygen at the sensing surface. This requires a constant movement
of the sample across the membrane to maintain a constant dissolved oxygen
level. It is recommended that the sample be stirred gently with the electrode as
the measurement is made, or if in a laboratory environment, the sample should
be stirred using a stir plate.
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OPERATIONAL MATRIX
Function /
Resulting Action
Power
Status
Mode
Setting
Required Button Press Sequence
ON/OFF Any Any Momentary press of the ON/OFF button
Water Saturated
Air Calibration
On Any Place electrode in electrode cap. Press &
hold CAL button for 2 seconds.
Zero Calibration On Any Place electrode in zero DO solution. Wait
for stability. Press & hold CAL
button
for 2 seconds.
Also works with probe
removed. (Cal at zero current).
Store Reading On Any Momentary press of MODE button.
Stores and holds reading. ‘HOLD’
displayed.
Hold Release On While In
Hold Mode
Momentary press of the MODE button.
Enter Memory
Retrieval
On Any Momentary press of CAL button followed
by a
momentary press of the MODE
button within 4 seconds. If no data is
stored in memory, ‘End’ is displayed
briefly, and then returns to last mode.
Scroll Stored
Readings
On Memory
Recall
Momentary press of MODE button.
Exit Memory
Retrieval
On Memory
Recall
Momentary press of CAL button.
Clear Stored
Memory
On Any
Measure-
ment Mode
Press and hold ON/OFF button for 4
seconds, ‘clr’ is displayed.
Change
Measurement
Mode
On Any Press and hold MODE button for
at least
two seconds.
Modes will scroll until button
is released.
Enter Salinity
Compensation
On Any Press and release the CAL button twice
quickly in succession. ‘SAL’ is displayed.
Changing
Salinity
Compensation
On SAL Momentary press of MODE button. Each
button press increases the ratio by 1 ppt
(part per thousand). The value cycles from
0 to 50 ppt.
Exit Salinity
Compensation
On SAL Press and release CAL button for 2
seconds to enter Altitude Compensation.
Or press and release CAL button one
more time to enter measurement mode. It
is necessary to press CAL button to save
changes. If the unit times out, no changes
are saved.
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Enter Altitude
Compensation
On Any
or SAL
Press CAL button twice quickly. Unit
enters Salinity Mode. Press CAL
button for 2 seconds to enter Altitude
Compensation Mode. ‘Ald” is displayed.
Unit times out in 5 seconds if no button is
pressed, reverts to previous mode.
Changing
Altitude
Compensation
On Ald Momentary press of the MODE button.
Each button-press increases altitude by
1,000 ft. The value cycles from 0 to 20,000
ft.
Exit Altitude
Compensation
On Ald Momentary press CAL button to exit and
save changes.
Change
Temperature
Units
Off OFF mode Press and hold the CAL button then
momentarily press the ON/OFF button.
Release the CAL button after ‘SELF CAL’
appears. It is necessary to press the CAL
button to save changes. If the unit times
out, no changes are saved.
Override Auto
Power Off
On Any Press CAL button momentarily then
simultaneously press and hold MODE
and ON/OFF buttons for 2 seconds.
Default Reset Off OFF mode Simultaneously press ON/OFF, CAL and
MODE buttons momentarily. ‘dFLt’ will be
displayed.
TROUBLESHOOTING
If the display appears to be frozen, it is possible that the Data Hold mode
hasbeen inadvertently activated. This is indicated by ‘HOLD’ in the bottom left
of the display. To exit the Data Hold mode press MODE or turn the meter off
and back on again.
If the meter locks up and pressing any buttons fails to revive it, remove the
batteries and then reinsert the batteries.
Symptom Possible Cause Action
Unit will not power on Batteries not in place
Dead batteries
Batteries polarity
incorrect
Insert, replace, or reorient
batteries
“BAT” indicator shown
on display
Batteries are weak Replace batteries
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Unstable readings Insufficient electrolyte
in probe. Air bubbles
visible when probe
inverted.
Electrolyte is depleted
Replace electrolyte, and
membrane cap assembly
Readings drift down Insufficient
stirring
Stir sample with meter or move
probe in sample
Slow response Dirty or damaged
membrane
Replace electrolyte and
membrane cap
Electrode can not be
calibrated
Depleted electrolyte
Dirty or damaged
membrane
Replace electrolyte and
membrane cap
Electrode can not
be calibrated
after
replacing electrolyte
and membrane cap
Dirty probe.
Cathode is not a shiny
gold color.
Clean cathode with cleaning
cloth or cleaning paper. Do not
over polish.
Sample reading is
frozen
Meter is in HOLD mode
Meter is locked
Release HOLD by momentarilly
pressing MODE button.
Remove batteries. Press ON/
OFF button. Replace batteries
and press ON/OFF button.
Stored readings will be lost.
MAINTENANCE
Battery Replacement
1. Twist off the battery compartment cover.
2. Holding the battery housing in place with a finger, pull out the
battery carrier using the two small tabs.
3. Replace the four (4) CR2032 batteries observing proper
polarity.
4. Replace the battery carrier, reattach the battery
compartment cap and tighten securely.
Battery Safety
¬Dispose of batteries responsibly; observe local, state,
and federal regulations.
¬Never dispose of batteries in a fire; batteries may explode or leak.
¬Never mix battery types; install new batteries of the same type.
Electrode Replacement
1. Turn the meter OFF. Turn the electrode retaining collar clock-wise and
remove it.
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2. Gently rock the electrode from side to side, pulling it away from the meter
until it disconnects.
3. Align the positioning “keys” of the replacement electrode and the main body
housing. Carefully push the electrode into the meter socket until it is fully
seated. CAUTION: Take care to align pins carefully. Bent or broken pins will
cause the meter to malfunction.
4. Tighten the electrode retaining collar until the electrode is firmly sealed to
the meter.
Replacing the Membrane Cap Assembly
The pH of the electrode filling solution in polargraphic dissolved oxygen meters
changes with time resulting in less accurate results. It is recommended that
the membrane and electrode filling solution be changed every 2 - 4 weeks
depending on usage. Because of the configuration of the membrane and
electrode, the membrane is stretched by the cathode and cannot be reused. It
must be replaced. See page 6.
Electrode Storage
Store the TRACER with the Electrode Storage Cap in place. The sponge in the
cap should always be moist without excess liquid.
Electrode Cleaning Recommendations
Contaminant Cleaning Solution Procedure
Salt build-up Deionized water Soak in 20% or weaker Acetic Acid
solution for 1 minute. Rinse thoroughly
with DI water.
Oil Warm water and
household detergent
Clean with mild detergent solution.
Rinse thoroughly with DI water.
NOTE: Do not contact the membrane with the cleaning solution. Install a new
membrane after cleaning the electrode.
WARRANTY
From the date of shipment: instrument for 1 year, probe for 6 months.
For support, contact LaMotte’s Technical Support at This warranty does not
apply to damages because of user misuse, operation outside of
specification, improper maintenance or repair, or unauthorized
modification.
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