LaMotte TRACER Mode D'emploi page 6

5. Insert the electrode into the sample making sure that the
electrodes are completely submerged.
6. Slowly stir the sample with the TRACER to remove air
bubbles.
7. The meter will autorange to the proper range and the
reading will be displayed.
8. Rinse the electrode in distilled water. Replace the cap.
100.9
„ Measuring the TDS of Soil
1. Fill a 50 mL beaker with the soil sample. Tap the beaker lightly on a hard
surface to remove trapped air. Remove excess soil from the surface.
2. Empty the soil into a 250 mL wide-mouth flask.
3. Add 100 mL of distilled water. Stopper and shake vigorously.
4. Wait 30 minute. (Shake the flask vigorously three or four
times during this period.)
5. Filter the contents of the flask. Collect the filtrate in a beaker.
6. Rinse the electrode with distilled or deionized water to remove
impurities.
7. Press the ON/OFF button to turn the TRACER on. Make sure the meter is in
the TDS mode.
8. Immerse the electrode in the filtrate. Make sure the tip of the electrode is
completely immersed.
9. Stir the filtrate with the electrode to create a homogeneous solution.
10. Gently stir the filtrate with the electrode. Read the TDS value of the filtrate
from the display.
11. Rinse the electrode in distilled water. Replace the cap.
„ Storing Readings
1. After the reading is displayed press and hold the MODE button
to store the current reading. The meter will enter the HOLD
mode and HOLD will be displayed. The storage location number
will be displayed on the lower display followed by the reading being stored.
2. Press the MODE button to exit the HOLD mode and return to normal
operation.
3. If an attempt is made to store more than 25 readings, the stored readings
will be overwritten starting with the first reading.
790 790
6
MODE
CAL
ON
OFF
SAL/EC/TDS
4.01