LaMotte TRACER Mode D'emploi page 7

2. Press the ON/OFF button. (8888 and then SELF CAL will
appear in the display during the initial diagnostics).
3. Press and hold the MODE button to scroll to the desired
measurement mode.
4. Immerse the TRACER electrode in the sample. Make sure
the electrode is completely submersed.
5. Slowly stir the sample with the TRACER to remove air
bubbles if in the Conductivity, TDS or Salinity mode.
6. If the TRACER is in the Conductivity, TDS, or Salinity mode, the meter
will automatically auto-range to the proper range and then display
the reading. The display will flash "0000" while auto-ranging.
7. If the TRACER is in the pH mode, the reading will flash until it has
stabilized. This may take several seconds depending on the buffer
capacity of the sample.
8. Rinse the electrode in distilled water. Replace the cap.
NOTE: 1 part per thousand (ppt) equals 1000 parts per million (ppm). Example:
3.1ppt=3,100 ppm
Conductivity
0 1000
µS
100.9
25.0
°C
NOTE: When measuring samples with low conductivity, thoroughly rinse the
probe with distilled or deionized water before placing it in the sample to avoid
contamination of the sample with electrolyte from the pH reference electrode.
Also increase the sample size to 200 to 500 mL to decrease the chance of
contamination. If a sample cup is used, do not allow the probe to sit in the sample
for any longer than necessary to avoid electrolyte leakage into the sample.
Leakage will raise the conductivity level.
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.
TDS (ppm)
0 1000
ppm
790
25.0
°C
TDS (mgL)
0 1000
mgL
790
25.0
°C
7
pH
7
2 12
790
pH
L M H
78.6
°F
Salinity
0 1000
ppm S
790
25.0
°C