Section 15 Theory Of Operation - Hach Anatel PAT700 User Manual

Section 15 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.
Ω
Additionally, conductivity (in µS/cm) or resistivity (in M -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 124 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.
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