PRODUCT INFORMATION
Milli-Q Synthesis/Synthesis A10 7
2-3 DESCRIPTION OF MAIN COMPONENTS
INLET SOLENOID VALVE
The Inlet Solenoid Valve is used to control the flow of feedwater into the Milli-Q system. The Inlet Solenoid Valve is
open when the system is delivering water from the Point Of Use Dispenser and during RECIRCULATION Mode.
PRESSURE RELIEF VALVE
The Milli-Q system has a Feedwater Pressure Relief Valve inside. The purpose of this is to vent out any Feedwater
that has a pressure higher than 0.75 bar (11 psi). This would prevent any excessive Feedwater pressure that could
build up in the Milli-Q system during RECIRCULATION Mode.
A piece of tubing is included in the Accessories Bag. This tubing is attached to the Milli-Q system and then placed
in a drain or sink. When the incoming Feedwater has a pressure greater than 0.75 bar, the Pressure Relief Valve
will open up and Feedwater will be vented to drain via the attached tubing. The water will stop flowing to drain
when the Feedwater Pressure drops to less than 0.75 bar. If a Pressure Regulator is installed on the Feedwater
Tubing (between the Milli-Q and a Loop), then it is unlikely that the Feedwater Pressure will get this high.
The installation of this tubing is described in more detail in Chapter 4 (Installation).
A Milli-Q fed from a Reservoir will not need the Pressure Relief Valve tubing. A Milli-Q fed from a Pressurised Pipe
(a Loop) should have the Pressure Relief Valve tubing installed during installation. Please note that the Pressure Relief
Valve is factory installed inside all Milli-Q systems and only the tubing needs to be attached during installation.
PUMP
The Pump is used to bring water into the Milli-Q and then to send it through the various components such as the Q-
Gard Purification Pack and the Quantum Ultrapure Cartridge.
Q-GARD
The Q-Gard Purification Pack is used to remove ions and organic molecules from the feedwater. The Q-Gard is a
consumable device. A consumable device is something that is periodically changed out for a new one during the
maintenance of the Water System.
WHAT ARE THE DIFFERENT TYPES OF Q-GARDS?
The Q-Gard 1 is used when the feedwater comes from RO, distillation or Electrodeionisation (EDI). An example of
RO or EDI feedwater is the water coming from either a Millipore RiOs or Elix Water Purification System. This type of
feedwater typically has some ions but contains little organic, particulate and colloidal contamination.
The Millipore Catalogue Number for a Q-Gard 1 is QGARD00R1. See Section 8-1 for more information.
The Q-Gard 2 is used whenever the feedwater comes from a source other than those mentioned above. An
example of feedwater requiring a Q-Gard 2 would be Service Deionised Water (this is the process of deionising
water by connecting bottles of ion exchange directly to tap water and deionising the tap water). Deionised Water
produced by multiple regeneration ion exchange resins may have a high level of organic, particulate and colloidal
contamination.
The Millipore Catalogue Number for a Q-Gard 2 is QGARD00D2. See Section 8-1 for more information.
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