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 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.
