Mã sản phẩm: CCU Chemical Changeover Controller
Tên sản phẩm: CCU Chemical Changeover Controller

USF Wallace & Tiernan continue to be the leader in the disinfection of potable, waste, industrial process and leisure water applications.

 80 Year of Experience
USF Wallace & Tiernan continue to be the leader in the disinfection of potable, waste,
industrial process and leisure water applications. With over 80 years of experience, the
design and manufacture of chemical feed and disinfection products, using the collective
expertise of the USF Wallace & Tiernan centres around the world, continues to produce safe
and reliable methods of controlling the addition of chemicals to water sources. Designed to
meet the global needs for the automatic changeover between two chemical supplies, the
Wallace & Tiernan CCU (Chemical Changeover Unit) is no exception.
Efficcient Chemical Controll
Automatic changeover of chemical supplies,
from a duty to a standby supply, is a
necessity in many installations which are
not under constant supervision and is
strongly recommended for all applications
where temporary interruption of chemical
supply might lead to unwanted complications.
The CCU will provide this automatic
changeover to ensure continuous chemical
supply. The supply of chemical is
controlled by a 3-port motorised valve, or
by a pair of 2-port motorised valves. A
pressure switch, or gauge is used to initiate
changeover when the pressure falls to a
preset level.
By utilising different valve arrangements,
the CCU provides automatic changeover
for a variety of chemicals in both pressure
and vacuum systems.
The CCU will provide changeover in low
or high pressure installations and will
handle both gas and liquid valve
arrangements as illustrated in the following
typical layouts.
Main Features
• Duty / standby valve changeover
ensuring continuous chemical supply
• Pressure or vacuum operation
• Suitable for use with a wide variety
of chemicals
• Controls single 3-port valve or two
2-port valves
• LED’s provide visual indication of
Valve Open / Exhausted for each supply
• Full monitoring of valve positions -
an alarm is generated if a valve fails to
open or close
• Changeover initiated by 1 or 2 pressure
/ switches - switch contacts may be
normally open or normally closed
• Shutdown input may be used to disconnect
both supplies in an emergency
(only available when 1 pressure / vacuum
switch is used)
• Volt-free Running contacts indicate
which supply is being used
• Volt-free Alarm contacts indicate
when a chemical supply is exhausted
• Manual changeover facility
• Inhibit timer prevents pressure
switch, or gauge, from initiating change
before a supply is fully on line
• Reset option returns CCU to known
state following power up