Merck Milli-Q EQ 7008 - Page 6

Introduction
6
This system uses potable tap water as feed and produces ultrapure (Type 1) delivered by 1 Q-POD
®
unit.
The system is divided into three sections. These are the production, the storage and the distribution.
Production: Tap water is rst puried by the IPAK Gard
®
pretreatment pack
which retains particles greater than 0.5 microns and removes chlorine. This helps
to prevent clogging and/or chlorine oxidation of the reverse osmosis cartridge(s).
Following the IPAK Gard
®
pretreatment pack, water is puried using Reverse Osmosis (RO). This is
used to remove a large percentage of ions, particles, bacteria, and large size organic molecules. The
water from this purication stage is called permeate water. This is the water that lls the storage tank.
Storage: The RO water is stored in high-quality polyethylene tank, which is equipped with
a vent lter and as a potential option with the mercury-free ech
2
o
®
automated sanitization
module (ASM) lamp. The tank vent lter maintains the consistent purity of stored water and
provides eective protection against airborne contaminants. The optional ech
2
o
®
ASM lamp
further protects the integrity of the stored water with regular exposure to bactericidal UV light.
Distribution: resistivity, TOC temperature and pressure are monitored. Tank is congured with a 2 or
5 meters connectors to the main production unit depending on the laboratory setting. The RO water
stored in the tank, is puried one step further by the IPAK Meta
®
polishing cartridge composed of ion-
exchange resins, removing the bulk of the ions. Water then ows to the UV oxidation lamp. Organic
molecules are partially oxidized, resulting in a release of ions. These can then be captured in the next
stage when the puried water enters the IPAK Quanta
®
polishing cartridge, composed of ion-exchange
resins and synthetic activated carbon. The IPAK Meta
®
and IPAK Quanta
®
polishing cartridges always
need to be replaced together to ensure optimal purication down to trace levels of contaminants.
Throughout the purication steps, quality parameters are monitored with resistivity and temperature
sensors and the TOC (total oxidizable carbon) indicator. The TOC indicator gives an indication of the
total organic content measured in ppb at the point of distribution.
The Q-POD
®
dispenser is detachable from its support. The dispenser uses an adjustable selector
wheel which allows dispensing of water at either a low, medium or high ow, from 0.5 to up to higher
than 1.8 L/min. At the outlet of the dispenser, the nal purication is performed by the application-
specic POD-Pak.
The large 7” touchscreen on the HMI oers a wide range of applications for users. It also has a USB
port to easily export data.