Converting Orp Readings To The Hydrogen Scale - palintest Macro 900 Operation Manual

Macro 900 Operation Manual
13.10.

Converting ORP Readings to the Hydrogen Scale

Electrochemical
hydrogen scale, the convention for which is that the electrochemical potential of
a hydrogen electrode in contact with hydrogen gas at one atmosphere partial
pressure and a solution containing hydrogen ions at unit activity is zero at all
temperatures.
The ORP reference electrode used in Palintest combination electrodes is a
3MPK1 silver chloride type, and exhibits potentials on the hydrogen scale of:
Thus, to refer an ORP potential value measured with the MAP 2000/2100 to the
hydrogen scale, the appropriate value above should be added to the measured
value.
© 2013 Palintest Ltd.
measurements
Temperature
5°C
10°C
15°C
20°C
25°C
30°C
35°C
40°C
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are ultimately
Potential
221 mV
217 mV
214 mV
210 mV
207 mV
203 mV
200 mV
196 mV
referred to the
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so-called