6
Functional description
6.1 Chemical principle behind the systems
Operate chlorine dioxide systems Bello Zon
®
according to the hydrochloric
acid-chlorite process:
Hydrochloric acid + sodium chlorite = chlorine d sodium ch
water
(4HCl + 5NaClO
2
= 4ClO
2
+ 5NaCl + 2H
2
O)
The Bello Zon
®
CDLb systems produce a 0.2 % chlorine dioxide solution (2
g/l ClO
2
or 1 g/l for the CDLb 6) through the combination of dilute hydro‐
chloric acid and dilute sodium chlorite solution.
6.2 System operating principle
The control provides an appropriate amount of diluting water in the mixer
vessel. Two metering pumps meter the chemicals Bello Zon
®
acid and
Bello Zon
®
chlorite into their respective measuring vessels until the level
switches in the vessels trigger. The control then empties the acid and
chlorite into the mixer vessel. After a defined reaction time has elapsed,
the control fills the mixer vessel with water until the vessel's level switch
triggers. This ensures that the produced solution is well mixed.
Thereupon, the control empties the content of the mixer vessel into the
external storage module. This ClO
2
solution can be metered using site-
supplied equipment (e.g. metering pumps).
–
"System" comprises the totality of the control for the
Bello Zon
®
system and everything located on its panel.
–
The "control" refers to the control in the housing on the
panel of the Bello Zon
®
system.
6.3 Safety equipment
The description of the safety equipment is contained in the chapter "Safety
Chapter".
General description
Definitions
Functional description
15