PuriSys CPF 201

2

Endress+Hauser

Function and system design

Measuring principle

pH measurement

The pH value is used as a unit of measurement for the acidity or alkalinity of a liquid medium. The

membrane glass of the electrode supplies an electrochemical potential which is dependent upon

the pH value of the medium. This potential is generated by the selective penetration of H+ ions

through the outer layer of the membrane. An electrochemical boundary layer with an electric

potential forms at this point. An integrated Ag/AgCl reference system serves as reference

electrode.

The transmitter converts the measured voltage into the corresponding pH value using the Nernst

equation.

Important properties

PuriSys CPF 201

• Reference system

The CPF 201 electrode has a porous Teflon reference junction in a double reference chamber

for long life in all high purity water applications.

• Temperature compensation

In addition, a Pt 100 or Pt 1000 temperature sensor is embedded in the pH glass bulb stem for

quick temperature response.

• Easy connection

The electrode is connected via the water-proof plug-in system TOP 68.

• Flow assembly

The flow cell has been designed to dissipate static electrical charges inherent in flowing water

with low conductivity. The flow assembly design minimizes trapped particles and contaminants.

Measuring system

The complete measuring system comprises:

• PuriSys CPF 201 electrode with stainless steel body

• PuriSys CPF 201 stainless steel flow assembly with compression fitting on inlet and outlet

• CPK 9 measuring cable (not included in scope of delivery)

• Transmitter, e.g. Liquisys M CPM 223, Mycom S CPM 153 (not included in scope of delivery)

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pH

ENDRESS+HAUSER

LIQUISYS M

CAL

REL

REL 1

REL 1

ALARM

REL 2

REL 2

E

Setpoint

R232

1

4