Thermo Scientific Barnstead GenPure with xCAD
Ultrapure water system
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8. Description of how the systems function
GenPure versions: Standard, UV, UF, UV/UF with xCAD
Tap water that has been pretreated upstream by reverse osmosis, ion exchange or distillation
passes through a pressure reducer and into the GenPure ultra pure water system, where the
conductivity is monitored. A pump forces this feedwater through UV-photooxidation (only with
GenPure UV and GenPure UV/UF) and the filter cartridge, from where it flows through an ul-
trafiltration module (only with GenPure UF and GenPure UV/UF), after which the conductivity is
measured by a special conductivity measuring cell (with temperature compensation).
When ultra pure water is taken from the system, it flows through a sterile filter before reaching
the dispensing outlet. During interval operation, the water is circulated around an internal circuit
at regular intervals.
GenPure versions: UV-TOC, UV-TOC/UF with xCAD
Tap water that has been pretreated upstream by reverse osmosis, ion exchange or distillation
passes through a pressure reducer and into the GenPure ultra pure water system, where the
conductivity is monitored. A pump forces this feedwater through UV-photooxidation, after which
the conductivity is again measured to determine the TOC-value. The water then flows through
the filter cartridge and an ultrafiltration module (only with GenPure UF-TOC/UF), after which the
conductivity of it is measured by a special conductivity measuring cell (with temperature com-
pensation).
The TOC value is calculated by taking the difference between the values measured by the
measuring cells QIA300 and QI302.
The measurement range is 0 - 30 ppb.
When this measurement range is exceeded, the number 99 is shown in the display instead of
the measured value.
In Stand-by operation, "___" is shown instead of the measured value.
When ultra pure water is taken from the system, it flows through a sterile filter before reaching
the dispensing outlet. During interval operation, the water is circulated around an internal circuit
at regular intervals.
