Figure 13 PAT700 theory of operation
1 Cell 5 Filter 9 Pump
2 Dual UV lamps 6 Online inlet 10 Vent
3 Heat exchanger 7 Bypass valve
4 Flow needle valve 8 To drain outlet
OASIS
™
(onboard automated standards introduction system) simplifies analyzer performance tests
with standards bottles tagged with Radio Frequency Identification (RFID) technology, which is a
registered radio frequency device. The RFID system transmits data wirelessly with radio waves and
operates over a very short distance to prevent interference with other wireless communications.
The RFID system communicates with tags and reader/writers. In the analyzer, the tag is attached to
the bottom of the standards bottles used in calibrations (conductivity and TOC), validations, system
suitability tests and excursion mode. The tag has a microchip attached to a radio antenna connected
to a substrate. The microchip keeps data about the standard contained in the bottle.
The OASIS system has four RFID reader/writers permanently attached inside the analyzer that align
with the bottle RFID tags when the bottles are fully loaded in the analyzer. The reader/writer retrieves
data from the tags. The tag keeps data about the identity of the standard, the concentration of the
standards, expiration date and other pertinent data. The reader/writer receives data from the tag and
sends the information digitally to the processor.
The RFID system can read and write to the tags attached to the standards bottle. This enables the
analyzer to write data to the bottles that shows the bottle has been used and also supplies data for
the exclusive excursion sampling feature.
The system operates without any user intervention and operates automatically when bottle tests are
done. The system powers on and off to read and write data only when necessary. The RFID labels
on the standards bottles contain the data necessary for each standard, the labels must not be
removed from the bottle. Without the label, the reader/writer has no data to read and will not operate
as intended, although bottles without labels can be used if the user manually enters data.
A touch-screen interface gives access to all analyzer functions. The user interface has a home
screen from which all user operations initiate. The home screen shows the current status of the
analyzer and analysis results based on the current run mode selection. The software can show data
in a number of user-selected formats, e.g., TOC, compensated and uncompensated conductivity,
resistivity and temperature in engineering units with data logging and graphing of the data.
A user may connect a USB flash drive to the analyzer and download the contents of the data buffer,
audit trail, alarm log and bottle analysis reports. Query the analyzer through an
RS232 communications port to remotely interact with the analyzer and also download data records.
Or communicate with the analyzer with Modbus
®
protocol via the Ethernet port. Print automatically or
on demand with an RS232 port to a serial printer.
English 51
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