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7. DATA ACQUISITION SYSTEM (DAS) & APICOM
The T802 analyzer contains a flexible and powerful, internal data acquisition
system (DAS) that enables the analyzer to store concentration and calibration data
as well as a host of diagnostic parameters. The DAS is capable of capturing
several months worth of data depending on how it is configured. The data are
stored in non-volatile memory and are retained even when the instrument is
powered off. Data are stored in plain text format for easy retrieval and use in
common data analysis programs (such as spreadsheet-type programs).
The DAS is designed to be flexible; users have full control over the type, length
and reporting time of the data. The DAS permits users to access stored data
through the instrument’s front panel or its communication ports.
The principle use of the DAS is logging data for trend analysis and predictive
diagnostics, which can assist in identifying possible problems before they affect
the functionality of the analyzer. The secondary use is for data analysis,
documentation and archival in electronic format.
To support the DAS functionality, Teledyne API offers APICOM, a program that
provides a visual interface for remote or local setup, configuration and data
retrieval of the DAS. The APICOM manual (included with the program),
contains a more detailed description of the DAS structure and configuration,
which is briefly described here.
The T802 includes a basic DAS configuration, which is enabled by default. New
data channels are also enabled by default, but each channel may be turned off for
later or occasional use.
Note
The DAS can be disabled only by disabling or deleting its individual data
channels.
The green SAMPLE LED on the instrument front panel, which indicates the
analyzer status, also indicates certain aspects of the DAS status:
Table 7-1: Front Panel LED Status Indicators for DAS
LED STATE DAS STATUS
steady off
System is in calibration mode. Data logging can be enabled or disabled for this mode.
Calibration data are typically stored at the end of calibration periods, concentration data are
typically not sampled, diagnostic data should be collected.
blinking
Instrument is in hold-off mode, a short period after the system exits calibrations. DAS
channels can be enabled or disabled for this period. Concentration data are typically disabled
whereas diagnostic should be collected.
steady on
Sampling normally.
07275B DCN6418