LaMotte Tracer 1749 Manual page 11

2. The last stored reading taken will be displayed first. To advance to
the previously stored readings, press the MODE button. The location
number
is displayed first, followed by the reading stored in that location.
3. To exit the storage mode, press the CAL button and the TRACER will
return to normal operation after displaying "End".
Clearing the Stored Memory
Turn the TRACER on. Press and hold the ON/OFF button for 4 seconds. The
display will briefly display "clr" when the memory is cleared.
CALIBRATION
For the most accurate results, allow sufficient time for the temperature of
the probe to reach the temperature of the sample before calibrating. This
will be indicated by a stable temperature reading on the display
Meter accuracy verification should be performed on a periodic basis as
needed. If calibration is required, the meter must be in the salinity mode
to perform a calibration for salinity, or in the conductivity mode to perform
calibrations for conductivity, and TDS. The meter can perform a calibration
and store the data for one range in the salinity mode and each of the three
ranges – low, medium and high for the conductivity and TDS modes. The
automatic calibration recognition procedure will recognize salinity standard
3,000 ppm (medium) and conductivity standards of 84 µS (Low), 1413 µS
(Medium) or 12,880 µS (12.88 µS) (High). (See Page 5). Always calibrate in
the range closest to the expected measurement value. For salinity samples
within the range of 1,000 to 9,999 ppm salinity, calibrate with a 3,000 ppm
calibration standard.
1. Fill a sample cup to 20 mL line with a calibration standard.
NOTE: The meter allows for a 1, 2, or 3 point calibration for conductivity
and TDS. If calibration is done for more than one point, the lowest
concentration should be done first to obtain the best accuracy.
Calibrate the ranges from low to high
2. Press the ON/OFF button to turn the TRACER on. Insert the electrode
into the standard. Tap or stir the sample with the Tracer to dislodge air
bubbles.
3. Press and hold the CAL button for approximately 2 seconds. "CAL" will
appear and the display will flash.
4. The meter will automatically recognize and calibrate to the calibration
standard. The display will briefly indicate "SA" and "End" and then return
to the measurement mode.
NOTE: "SA" will not appear if the calibration fails.
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