Additional functions Liquistation CSF48
102
6.3.6 Calculated pH value
The pH value can be calculated from the measured values of two conductivity sensors under
certain conditions. Areas of application include power stations, steam generators and boiler
feedwater.
Path: Menu/Setup/Additional functions/Mathematical functions/MF 1 to 6/Mode/pH calculation from
conductivity
Function Options Info
Calculation Options
•Off
•On
Factory setting
Off
On/off switch for the function
Method Options
•NaOH
•NH3
•LiOH
Factory setting
NaOH
The calculation is performed on the basis of Guideline
VGB-R-450L of the Technical Association of Large
Power Plant Operators ( Verband der
Großkesselbetreiber, (VGB)).
NaOH
pH = 11 + log {(
v
- 1/3
h
)/273}
NH3
pH = 11 + log {(
v
- 1/3
h
)/243}
LiOH
pH = 11 + log {(
v
- 1/3
h
)/228}
v
... "Inlet" ... direct conductivity
h
... "Outlet" ... acid conductivity
Inlet Choice of conductivity
sensor
Inlet
Sensor upstream from the cation exchanger, "direct
conductivity"
Outlet
Sensor downstream from the cation exchanger, "acid
conductivity"
The choice of measured value is obsolete since it must
always be "Conductivity".
Outlet
Calculated pH Read only View this value in a user-defined measuring screen or
output the value via the current output.
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