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
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1
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