LaMotte Tracer DO PockeTester User manual

Water Testing Leader Since 1919!
Tracer DO PockeTesterTM
Code 1761
FILL - Before first use
POLARIZE - Weekly
CALIBRATE - Daily
See Pages 9-12

WARNING! This set contains chemicals
that may be harmful if misued. Read
cautions on individual containers
carefully. Not to be used by children
except under adult supervision.

TRACER
DISSOLVED OXYGEN • CODE 1761
Introduction .....................................................................................4
Specifications..................................................................................4
Contents ..........................................................................................4
Parts & Accessories........................................................................5
Meter Description
Front Panel Description ............................................................... 5
Display.......................................................................................... 5
Operation
Filling the Electrode..................................................................... 6
Powering the TRACER................................................................. 6
Startup Polarization Period.......................................................... 6
Turn-on Diagnostics .................................................................... 6
Changing the Temperature Units ................................................ 6
Changing Salinity Compensation................................................ 7
Changing the Altitude Compensation......................................... 7
Changing Measurement Units..................................................... 7
Auto-Power Off Feature ............................................................... 8
Disabling Auto-Power Off Feature............................................... 8
Low Battery Indicator................................................................... 8
Storing Readings ......................................................................... 8
Recalling Stored Readings.......................................................... 8
Clearing Stored Readings ........................................................... 8
Set Up
Membrane Cap Assembly - Filling and Replacement ................ 9
Polarization ................................................................................. 10
Calibration................................................................................... 10
Optional Zero Oxygen Calibration.............................................. 11
Dissolved Oxygen Measurement...................................................12
Operational Matrix..........................................................................13
Troubleshooting .............................................................................16
Maintenance
Battery Replacement .................................................................. 17
Battery Safety.............................................................................. 17
Electrode Replacement ............................................................. 17
Replacing the Membrane Cap.................................................... 17
Electrode Storage ....................................................................... 18
Warranty ...................................................................................... 18
Short Form Instructions (back cover)

4
INTRODUCTION
Congratulations on your purchase of the Dissolved Oxygen/Temperature TRACER.
Units of measure are % saturation, mg/L or ppm for dissolved oxygen
and C° or F°
for temperature. Advanced features include data hold, 25 point memory,
auto shut off,
automatic temperature compensation, and salinity/altitude compensation.
Careful use and maintenance will provide years of reliable service.
SPECIFICATIONS
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 f tting
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 Code DO600-EL
Sample cup and Lanyard

5
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, 1 meter (with probe guard and weight) Code 1764
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)
2t
5
10
710
20
12
mg/L
*
5
6
%

6
OPERATION
Filling the Electrode
The electrode is shipped dry and requires f lling with the supplied electrolyte
solution before the f rst use. The membrane should be in place and does not need
to be replaced. Follow the procedure on page 9 for f lling 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 f rst 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 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 T
emperature 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.

7
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
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, brief y
press the MODE button to turn it off.

8
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.
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.

9
SET UP
Membrane Cap Assembly - Filling and Replacement
The electrode is shipped dry and requires f lling with the supplied electrolyte
solution before the f rst 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
f rmly 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 f at 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.
FILL

10
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
and desirable since it will minimize air pockets in the solution. Air pockets
can compromise dissolved oxygen measurements. If the electrode solution
does not overf ow, an insuff cient 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.
Polarization
If the meter has not been used for seven (7) days or longer the electrode will not
be fully polarized. A fully polarized electrode is indicated by a small, f ashing,
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 f lled 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.
CALIBRATE

11
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 sulf te.
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 Sulf te can become deposited on the electrode and on
the coined surface of the electrode retaining collar. The presence of the
Sodium Sulf te will negatively affect dissolved oxygen measurements
unless it is removed completelyfrom the electrode.
CALIBRATE

12
DISSOLVED OXYGEN MEASUREMENT
(Be sure the electrode is f lled 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 suff cient 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 ten (10) seconds to f ve (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.
MEASURE

13
OPERATIONAL MATRIX
Function /
Resulting
Action
Power
Status
Mode
Setting
Required Button
Press Sequence
Comments
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
brief y, 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.

14
0
Function /
Resulting
Action
Power
Status
Mode
Setting
Required Button
Press Sequence
Comments
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.
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.

15
0
Function /
Resulting
Action
Power
Status
Mode
Setting
Required Button
Press Sequence
Comments
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.
It is necessary
to press the
CAL button to
save changes.
If the unit
times out, no
changes are
saved.
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.
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.

16
TROUBLESHOOTING
- If the display appears to be frozen, it is possible that the Data Hold mode has
been 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
Unstable readings Insuff cient electrolyte
in probe. Air bubbles
visible when probe
inverted.
Electrolyte is depleted
Replace electrolyte, and
membrane cap assembly
Readings drift down Insuff cient
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.

17
MAINTENANCE
Battery Replacement
1. Twist off the battery compartment cover.
2. Holding the battery housing in place with a f nger, 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 f re; 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.
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.
4. Tighten the electrode retaining collar until the electrode is f rmly sealed to
the meter.
Replacing the Membrane Cap Assembly
See page 9.

18
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.

Short Form Instructions
Fill the membrane cap assembly before the f rst use.
Follow Set Up instructions before the f rst use.
Read the entire manual before the f rst 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.
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