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Macro 900 Operation Manual
V3
© 2013 Palintest Ltd.
www.palintest.com
Page 43 of 147
13.10.
Converting ORP Readings to the Hydrogen Scale
Electrochemical measurements are ultimately referred to the so-called
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:
Temperature
Potential
5°C
221 mV
10°C
217 mV
15°C
214 mV
20°C
210 mV
25°C
207 mV
30°C
203 mV
35°C
200 mV
40°C
196 mV
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.
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