Orp Calibration - Extech Instruments 341350A User Manual

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
standardizing 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
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",
to the measurement mode.
Note: The "SA" will not appear if the calibration fails.
5. The "range calibrated" symbol 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.

ORP Calibration

The ORP electrode does not require calibration.
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
sample.
5. Momentarily press the UNIT/SET button to save the change and return to the
measurement mode.
button (approximately 2 seconds) until the main
to set the display to indicate the known temperature of the
6
"End" and then return
341350A V1.1 1/09
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