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3
Calibration
1 Power off the meter. Press and hold CAL then press ON/OFF. If successful,
"rST" will blink on the display. Release both keys.
2 Press HOLD/ENTER to enter the reset menu.
3 Press MODE to toggle between No Reset (nO), Calibration Reset (CAL),
or Factory Reset (FCt). Press CAL to cancel.
4 Press HOLD/ENTER to confirm the selected reset type. The meter will
automatically begin measurement mode.
3.2 Millivolt (mV) Calibration
Oxidisation Reduction Potential (ORP or Redox) as measured by an ORP
electrode in mV units is not a precise measurement, but is useful as a relative
indicator. As such, mV offset adjustment is not meant to enhance accuracy,
but rather to make readings comparable to a reference.
Commercial ORP solutions are commonly used as a check standard - a
meter/electrode system is verified to be close to a given value although
adjustments are not made. These solutions can be used as a calibration
standard in which adjustments are made in an attempt to match the ORP
value, however results are often difficult to reproduce.
1 Turn on the meter and select mV mode by pressing MODE if necessary.
Dip the ORP electrode into a solution with a known mV value (e.g. Zobel,
Light's, quinhydrone, or iodidetriiodide) and provide brief or slow stirring.
1
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