16 of 220 Introduction - Anatel A643a
RPS - June 2007 - Edition 12
Operator Manual Anatel
1.3 Operational Overview
The Anatel A643a Analyzers employ a patented photocatalytic method which measures the
conductivity of the sample before and after its oxidation by ultraviolet (UV) light. The water
sample is isolated from the ambient environment to eliminate external contamination and the
TOC concentration is determined using an algorithm that measures the change in the sample’s
conductivity. The change in conductivity is a direct function of the amount of organic carbon
present and its oxidation to carbon dioxide (CO
2
), allowing the TOC content of the sample
water to be calculated.
The results of each sample analysis are digitally displayed on the front panel of the
corresponding Sensor, and its supervisory C80 Controller, as a concentration of TOC in ppb.
Additionally, conductivity (in µS/cm) or resistivity (in MΩ–cm), uncompensated for temperature
or corrected to 25°C, and sample temperature are measured then displayed. A selection of
data printouts is available.
An integral alarm scheme reports any abnormalities detected during Analyzer operation. A
TOC limit (or uncompensated conductivity limit) excursion is automatically output to a printer
and logged for display on associated C80 Controllers.
Anatel A643a Analyzers also perform ongoing TOC trend analyses to facilitate water quality
management. Each instrument measures the change in TOC over the past hour and reports its
directional trend. By further examining the exact TOC values on a printout, the user can
determine if the trend is critical and respond accordingly.
UV Detect™
Technology
UV Detect is an optional feature. Analyzers with UV Detect can be
identified by a UV Detect label on the analyzer housing and a -UV in the
catalog number. UV Detect provides an additional level of diagnostics
to the Anatel A643a analyzer, by continuously monitoring the level of
the ultraviolet (UV) output by the analyzer lamp. When a marginal level
of UV light or failed output is detected diagnostic messages are
provided from the instrument. This feature ensures the TOC output
value is always representative of a sample oxidized with the proper
level of UV.
Individual Alarm
Monitoring
TOC levels may be monitored for all connected Anatel A643a
Analyzers and compared to user-defined alarm limits for each
instrument. The user is alerted to any limit excursions by the C80
Controller which flashes its LCD display as well as the Sensor’s
corresponding LED. An audible beep or usersupplied external alarm
may be enabled for additional warning. The Anatel A643a also can be
set to alarm at USP recommended uncompensated conductivity levels.
Local Area
Networking (LAN)
Capability
The ability to link as many as eight Anatel A643a Analyzers to a single
C80 Controller provides timely readings of TOC levels even at the most
distant and crucial areas of the water system. The C80 Controller can
be mounted wherever convenient to make the TOC levels at several
key locations immediately available on a single display. Analog, Digital
I/O, Serial and 12 VDC Bias connections allow quick and easy
connection to any external device to further enhance system
capabilities.
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