EUTECH INSTRUMENTS 2700 Manuál s instrukcemi stáhnout pdf (Strana 20)

7. Millivolt (mV) Calibration (Offset Adjustment)

Oxidization 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/ele

ctrode 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 m

eter on, connect an ORP electrode, and press MODE if needed for mV

(or R.mV) measurement.

2) Dip the ORP

electrode into a solution with a known mV value (i.e. Zobel,

Light’s, quinhydrone, or iodidetriiodide) with brief or slow stirring.

3) Press

CAL when the reading is stable. The upper display shows the active

millivolt value (mV) while the lower display shows the factory default mV value

without calibration. The example below at right shows a mV calibration that

had previously been calibrated with a 10.0 mV offset.

4) Adjust the upper display using up/down arrows, press ENTER to accept the

calibration offset. The maximum adjustable value is ±150 mV from the factory

default mV value.

Additional mV calibration notes:

When an offset has been stored successfully, R

.mV replaces mV in measurement

mode.

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EUTECH INSTRUMENTS 2700 Manuál s instrukcemi Strana 20