the PAT700 analyzer operates over a very short distance to prevent any interference with other
wireless communications.
The term RFID describes a system that transmits data wirelessly using radio waves. An RFID system
is includes a “tag” and a “reader/writer”. The tag is attached to the standards bottles used in
calibrations (conductivity and TOC), validations, system suitability tests and excursion mode. The
RFID tag includes 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 that are
permanently mounted inside the analyzer. The RFID reader/writers 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 concentration of the standard solution, 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 lets the PAT700 write data to the bottles
identifying 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 done. The system automatically switches 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. There are no user-serviceable parts associated with the
RFID system. The RFID reader/writer board assembly should only be serviced by a Hach certified
service representative.
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.
Data log
The data log holds up to 5,000 records. The data log contains analysis results, alarms, bottle test
results and audit trail entries. Since the audit trail is kept in the data log, each audit trail entry uses
one of the 5,000 data log entries.
The data log operates in a first in first out approach. Once the data log contains 5,000 entries the
oldest entry is replaced with the newest entry.
The contents of the data log shows in the Data Review screen. Refer to Manage measurement data
on page
26. The Data Review screen is populated only when data logging is selected in the security
settings. The Data Review screen shows a list of all the data in the data log as will show on a
printout.
The data shown on the Data Review screen is filtered based on the settings in the filter dialog box.
Refer to Set the data filter on page 26. Data is shown in chronological order from earliest to most
recent. The list scrolls to display the earliest data.
Default settings
Table 20 shows the parameters and default settings of the analyzer.
Table 20 Parameters and default settings
Parameter Default setting
TOC Setup
Flush time 1 minute
Cycle time 0
Use pump Disabled
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