LaMotte TRACER POCKETESTER FLUORIDE - Manual (Page 10)

10
Calibration Frequency
A 1 point calibration is adequate prior to each new measurement batch or if more
than 24 hours has elapsed since the last calibration. A 2 point calibration should
be performed if the meter is new or has not been calibrated for 5 days.
Slope Adjustment
1.
Slope adjustment, although not a frequent requirement, can be carried
out by following the instructions in Calibration above and by calibrating
with a 10.0 ppm standard after calibrating with the 1.0 ppm standard.
2. Press the CAL key until 10.0 ppm appears. Slope adjustment is then
complete.
Other standards
As mentioned the Fluoride TRACER can also be calibrated between 0.5 and 5.0
ppm Fluoride. Follow the calibration instructions above but substitute 0.5 ppm
for 1.0 ppm and 5.0 ppm for 10.0 ppm.
Measurements
1.
Prepare an unknown solution by adding, crushing, and dissolving one TI-
SAB TesTab (7024) in 20 mL of the sample or by adding TISAB reagent
to the sample in the same dilution ratio as for the calibration procedure.
Mix thoroughly.
2. Rinse the end of the Fluoride TRACER.
3. Place the Fluoride TRACER into the prepared unknown sample. If the
instrument is in the HOLD mode, press MODE/HOLD to unlock HOLD.
4. After 25 seconds, the instrument will display the value of the unknown
concentration and will then enter the HOLD mode.
Note: The readings can be stored in the memory by pressing the MODE/
HOLD key for approximately 3 seconds as explained in a subsequent sec-
tion of this user guide.
Temperature Units (ºF / ºC)
1.
With the unit OFF, press and hold the CAL/RECALL key.
2. With the CAL/RECALL key depressed, momentarily press the ON/OFF
button to turn the unit ON.
3. The CAL/RECALL key can be released when ‘Self Cal’ is shown in the
display.
4. To switch back to the previous unit of measure, repeat steps 1 through 3.