User manual

PAT700 Total Organic Carbon Analyzer – Theory of Operation Page 181
Anatel Operator Manual
Appendix C: Theory of Operation
The Anatel PAT700 on-line TOC analyzer provides TOC analysis for pure and ultra-pure
water processing. The PAT700 oxidizes a water sample to determine the TOC in the sample.
The analyzer traps a sample in the analysis cell, exposes the sample to ultraviolet (UV) light
to oxidize a sample of water (photolysis), and monitors changes in temperature and
conductivity until the sample has completely oxidized. Once full oxidation has occurred, the
analyzer reports TOC.
Additionally, conductivity (in µS/cm) or resistivity (in M
Ω-cm), uncompensated for temperature
or corrected to 25°C, and sample temperature are measured then displayed along with the
oxidation curve type, and TOC trend. The PAT700 incorporates an integral in-line filter, flow
control valve and heat exchanger to ensure the proper water flow rate and temperature for
accurate TOC analysis. An internal pump is available for sampling water from a supply with
no pressure and to deliver standards to the analysis cell from the OASIS™.
Figure C-1 PAT700 theory of operation
The PAT700 incorporates the OASIS™ onboard, automated standards introduction system
that simplifies analyzer performance testing using standards bottles tagged with RFID
technology. OASIS™ employs Radio Frequency Identification (RFID) technology, a
registered radio frequency device. The RFID system in the PAT700 operates over a very short
distance to eliminate any interference with other wireless communications. The term RFID
describes a system that transmits data wirelessly using radio waves.
An RFID system is comprised of a "tag" and a "reader/writer". In the PAT700 analyzer, the tag
is attached to the standards bottles used in calibrations (conductivity and TOC), validations,
system suitability tests, and excursion mode. The RFID tag consists of a microchip attached