Extech Instruments 793950343524 User Manual page 6

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Conductivity (TDS & Salt) Calibration
Conductivity accuracy verification should be performed on a periodic basis; once per month is
the recommended cycle for normal use. If calibration is required, a conductivity standard
solution must be obtained. The meter can be calibrated in any or all of the three ranges.
Standardizing solutions of 84µS/cm, 1413µS/cm or 12.88mS/cm (12,880µS/cm) are used for the
automatic calibration recognition procedure. No other calibration values are permitted.
Calibration is always done in conductivity mode. Since salinity and TDS values are calculated
from conductivity values, this procedure also calibrates the Salinity and TDS ranges.
1. Fill a sample cup with the standardizing solution.
2. Turn the meter ON and insert the electrode into the solution. Tap or move the electrode in
the sample to dislodge any air bubbles.
3. Press and hold the MODE/CAL button (approximately 2 seconds) until the main display
starts flashing.
4. The meter will automatically recognize and calibrate to the standardizing solution. At the
end of the calibration, the display will briefly indicate "SA", "End" and then return to the
measurement mode.
Note: The "SA" will not appear if the calibration fails.
5. The "range calibrated" alert will appear in the display for each range that is calibrated
during that power on cycle.
Low range, 84µS/cm
Medium range, 1413µS/cm
High range, 12.88mS/cm (12,880µS/cm)
Note: The meter allows for a 1, 2 or 3 point calibration. If calibration is done for more than one
point, the lowest value standard should be done first to obtain the best accuracy.
Temperature (pH and Conductivity) Offset Calibration
This procedure allows for error correction of the external temperature probe (pH) or the
conductivity probe's built‐in temperature sensor.
1.
Switch to pH or Conductivity (Salt/TDS) mode.
2.
Place the temperature probe or conductivity cell in the sample and allow the temperature
reading to stabilize.
3.
Press and hold the UNIT/SET button until the ºC or ºF icon begins flashing.
4.
Adjust the ▼ or ▲ buttons to set the display to indicate the known temperature of the
sample.
5.
Momentarily press the UNIT/SET button to save the change and return to the measurement
mode.
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