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Setup Menu Teledyne API T803 CO2/O2 Analyzer Operation Manual
64
5.4. SETUP RNGE: ANALOG OUTPUT REPORTING
RANGE CONFIGURATION
5.4.1. PHYSICAL RANGE VERSUS ANALOG OUTPUT REPORTING
RANGES
Functionally, the T803 analyzers have one hardware PHYSICAL RANGE that is
capable of determining concentrations from 0.00% to 100.00% for O
2
; CO
2
is
variable depending on the exact CO
2
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 a T803 is being used to measure
atmospheric O
2
concentration, the full scale of expected values is only 21% of the
instrument’s full measurement range. Unmodified, the corresponding output
signal would also be recorded across only 21% of the range of the recording
device.
The T803 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.
07276B DCN6418