CENTRA – MDS/LDS/RDS US Operator Manual
ELGA
Page 4
CENTRA – MDS/LDS/RDS US Version 01 – 08/14
3.2
Process Description
CENTRA – LDS US
•
Feed water enters through a control valve (V1), which in
combination with the level sensor (LS1) controls the
volume of water in the 350 liter (92USG) reservoir.
•
ELGA systems providing the feed water will be controlled
by the
CENTRA – LDS US
to maintain a sufficient level
of water within the reservoir.
•
The pump distributes the water around the installation at
pressure (6 bar maximum) controlled manually via the
pressure-regulating valve (PSV1) and monitored with a
pressure gauge (PG1).
•
Products fitted with a variable speed recirculation pump
(P2) use feedback from a pressure transducer (PT1) to
regulate the pump output to maintain a constant outlet
pressure (typically 4 bar). This also reduces the outlet
flow when water is not being taken from the recirculation
loop.
•
Flow around the system is monitored electronically using
a flow sensor (FS1) and shown in selectable units of
measurement on the display.
•
Air is drawn into the reservoir when water is used. To
maintain water purity it is necessary to filter the air. Air-
borne particles and bacteria are removed by an air-filter.
Alternatively an improved level of water purity can be
maintained within the recirculation system using a
composite vent filter, which removes air-borne
contaminants such as volatile organic compounds and
carbon dioxide.
CENTRA – RDS US
•
Feed water enters through a control valve (V1), which in
combination with the level sensor (LS1) controls the
volume of water in the 350 liter (92USG) reservoir.
•
The feed water passes through a:
•
Water quality sensor (QS1), which measures the
conductivity of the water.
•
Temperature sensor (TS1).
•
ELGA systems providing the purified water will be
controlled and monitored by the
CENTRA – RDS US
to
maintain a sufficient level of water within the reservoir.
•
The pump (P1) distributes the pre-purified water around
the installation at pressure (6 bar maximum) controlled
via the pressure-regulating valve (PSV1) and monitored
with a pressure sensor (PS1).
•
Connections are available to incorporate a range of
cylinders containing water purification media, which
remove impurities and maintain water quality around the
system. The media can be selected to meet specific
requirements. Typically activated carbon and ion-
exchange media are used.
