4
Radeberger Str. 21; 01900 Großröhrsdorf
Tel. / Fax. 0049 35952- 429465 /- 429457
E-Mail:
; www.dks-engineering.de
3. Measuring principle
The principle of recording the moisture content of gases is based on the electrolysis of water,
which is adsorbed by phosphorus pentoxide. In the AQUATRACE® IV, the sensor coated with
H
3
PO
4
is
surrounded by a precisely defined amount of gas. The cell parameters and the flow
velocity are coordinated in such a way that the acid always absorbs a constant proportion of
the gas moisture and this proportion is electrolyzed in the same unit of time. The consequence
of this is the setting of a dynamic equilibrium in which the flowing current is directly
proportional to the moisture content.
4. Measurement setup
The measuring cells consist of the
sensor
in the form of a cylindrical carrier, optionally of:
-ZrO
2
with an interdigital structure of Pt layers, or of glass with bifilar wound Pt electrodes,
and the sensor housing, which
is available in rust-free stainless steel ( V4A ) or in PVDF,
This means that almost all requirements regarding corrosion resistance can be met.
