Measurement Principle; Co 2 Measurement - Pentair HAFFMANS c-DGM Instruction Manual

4.2

Measurement principle

*O measurement
2
O measurement is based on measuring the luminescence of an oxygen-sensitive layer. The
2
fluorescence changes depending on the partial oxygen pressure. The quantity of dissolved gas
in the liquid is calculated by using the partial oxygen pressure and temperature.
CO measurement
2
The measurement of CO
gas and a liquid in an enclosed space. The law says that, at a constant temperature, the
quantity of gas dissolved in the liquid is proportional to the partial pressure of the gas above the
liquid.
It is therefore possible to measure the quantity of CO
both the equilibrium pressure of CO
concentration is calculated with the CO
4.3 CO measurement
2
The handle (pos. 20) operates the lever (pos. 07), which automatically regulates the inlet, the
outlet, and the connection from the expansion vessel to the measurement chamber.
The handle has two positions:
Sampling:
Measurement:
The throttle valve is located in the outlet of the measurement chamber and regulates the flow of
the product through the measurement chamber.
The measurement results (temperature, pressure, and CO
the logbook.
Page 16 of 78
is based on Henry's law, which describes the equilibrium between a
2
above the liquid and the temperature of the liquid. The
2
formula (see Appendix I).
2
The handle is retracted.
The inlet and outlet of the instrument are open and the expansion vessel
is connected to the outlet.
The handle is depressed.
The inlet and outlet of the instrument are closed and the expansion
vessel, which functions as a gas reservoir, is connected to the
measurement chamber. Depressing the handle initiates the
measurement.
, &&D E^ 'D 'D
dissolved in a liquid sample by measuring
2
value) are displayed and stored in
2
c-DGM/i-DGM