Bionics TX-2300KFP, Руководство по установке и эксплуатации

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TX-KFP
Bionics Instrument
© 2004 Eur 20040426, all rights reserved
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Appendix 1- Principle of Membrane electrolysis
Explanation of the principle of membrane electrolysis
When the gas being monitored passes through the membrane (1), an electrochemical reaction
arises at the working electrode (2), which is in contact with the liquid electrolyte (3). An
equivalent “redox” reaction then occurs at the counter electrode (4) producing a current ‘i’
that is in linear proportion to the partial pressure of the detected gas.
‘i’ is calculated according to the following formula:
Where:
n = number of electrons per mole of gas
F = Faraday’s constant (approx. 96,500 coulombs)
a = area of working electrode
D = diffusion coefficient of the gas in cm/sec.
C = gas concentration in moles
d = thickness of the diffusion layer in cm
Figure A.1.1
d
nFaDC
I
=