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Setup Menu Teledyne API T801 NDIR CO2 Analyzer Operation Manual
64
5.3. SETUP DAS: INTERNAL DATA ACQUISITION SYSTEM
Use the SETUP>DAS menu to capture and record data. Refer to Section 7 for
configuration and operation details.
5.4. SETUP RNGE: ANALOG OUTPUT REPORTING RANGE
CONFIGURATION
Use the SETUP>RNGE menu to configure output reporting ranges, including
scaled reporting ranges to handle data resolution challenges. This section
describes configuration for Single, Dual, and Auto Range modes.
5.4.1. PHYSICAL RANGE VERSUS ANALOG OUTPUT REPORTING
RANGES
Functionally, the T801 analyzers have one hardware PHYSICAL RANGE that is
capable of determining concentrations from 0.00 % to 20.00 % (the full range of
the sensor).
This architecture improves reliability and accuracy by avoiding the need for
extra, switchable, gain-amplification circuitry. Once properly calibrated, the
analyzer’s front panel will accurately report concentrations along the entire span
of its physical range.
Because many applications use only a small part of the analyzer’s full physical
range, data resolution problems can occur for most analog recording devices. For
example, in a typical application where an T801 is being used to measure low
levels CO
2
concentration, the full scale of expected values could be 10% of the
instrument’s full measurement range. Unmodified, the corresponding analog
output signal would also be recorded across only 10% of the range of the
recording device.
The T801 analyzers solve this problem by allowing the user to select a scaled
reporting range for the analog outputs that only includes that portion of the
physical range relevant to the specific application.
Only this REPORTING RANGE of the analog outputs is scaled, the physical
range of the analyzer and the readings displayed on the front panel remain
unaltered.
Note
Both the DAS values stored in the CPU’s memory and the concentration
values reported on the front panel are unaffected by the settings chosen for
the reporting range(s) of the instrument.
07274B DCN6418