Hach Anatel PAT700 User Manual page 184

Theory of Operation
Page 182
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 to a radio antenna mounted on a substrate. The RFID tag is attached
to the bottom of the standards bottle. The microchip contains data about the standard
contained in the bottle. The PAT700 OASIS system contains four RFID reader/writers
permanently mounted inside the analyzer that align with the bottle RFID tags when the
bottles are fully loaded in the analyzer.
The reader/writer retrieves the data stored on the RFID tags located on the bottom of the
standards bottles. The RFID reader/writers have antennas that emit radio waves and
receive signals back from the tags on the standards bottles. The information provided
from the tag includes the identity of the standard, the standard's concentration, date of
expiration and other pertinent data. The reader/writer takes the data received from the
tag and passes the information in digital form to the PAT700 processor.
The RFID system in the PAT700 can read and write to the RFID tags attached to the
standards bottle. The writing feature allows the PAT700 to write data to the bottles
showing that the bottle has been used and provides for writing of data for the exclusive
excursion sampling feature. The RFID system in the PAT700 does not require any user
intervention to operate.
The system operates automatically when bottle tests are performed. The system
automatically turns on and off to read and write data only when necessary. When
enabled, the radio frequency modulation emitted from the antennas is fixed at 13.56 Mhz.
Since 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 RFID
reader/writer has no data to read and will not operate as intended; however, bottles
without labels can be run if the user manually enters data.
A touch-screen interface provides access to all analyzer functions. The user interface
consists of a home screen from which all user operations initiate. The home screen
displays the current status of the analyzer and analysis results based on the current run
mode selection. The software can display data in a number of user-selected formats,
including TOC, compensated and uncompensated conductivity, resistivity, and
temperature in engineering units, with data logging and graphing of the data.
You 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. You can interact with the
analyzer remotely, including downloading data records, by querying the analyzer through
an RS-232 communications port. You can communicate with the analyzer using
Modbus® protocol via the Ethernet port. Printing may be done automatically or on
demand through an RS-232 port to a serial printer.
The PAT700 allows for compliance to 21 CFR Part 11 with password protection and an
audit trail of all user actions.