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Transmitter 9135 - pH/redox measurement
Measurement principle
1000
800
600
400
200
0
Page 66
In our system, the electrode impedance measurement
results from the measurement system without addition
of commutation circuits.
A non-oxidising electrode permits to set the liquid
potential to the zero measured. A very stable voltage
(equal to E) is applied to the electrode. Two capacities
are loaded through the electrode impedance. After a
certain time (which depends on the impedanc e
measured),
variation on each electrode.
The process temperature is measured to compensate
the impedance measurement of the glass electrode.
The impedance measurement drift of the glass
electrode according to the temperature is represented
by the curve below :
Impedance measurement 8404_b
0
5
10
15
impedance (T°C)
the
system
( Mohms )
20
25
30
Temperature (°C)
measures
the
35
40
45
impedance (25°C)
potential
50
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