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Teledyne API Model 100AH SO
2
Analyzer Instruction Manual, 02417, Rev. D
5.2 Sample Mode
5.2.1 Test Functions
NOTE
In any of the following TEST functions, if XXXX is displayed,
that indicates an off scale and therefore meaningless reading.
To use the TEST functions to diagnose instrument faults, refer to Troubleshooting Section 10.1.
Range
This is the range of the instrument. In standard configuration there is one range for both REC
and DAS outputs.
Dual range allows a different range for each output. When enabled, the RANGE test
measurement is replaced with two different test measurements, RANGE1 (LOW RANGE) and
RANGE2 (HIGH RANGE).
Auto range option allows a low range and high range. The M100AH will automatically switch to
the other range dynamically as concentration values require. The TEST values will show the
range the instrument is currently operating in, and will dynamically display the alternate range as
the range changes occur.
Stability
The instrument stability is used to indicate the stability of measurement of analyzer. It is
computed as the standard deviation of 25 samples of a moving window with interval of 10
seconds between each sample.
Sample Pressure
Sample pressure is measured using a solid state pressure sensor at the upstream of the flow
control module. This reading will vary according to the sample gas pressure, altitude and local
weather condition.
Vacuum Pressure
Sample pressure is measured at the downstream of the flow control module. This reading is the
reaction cell pressure which is used by the CPU to compensate the SO
2
concentration due to its
pressure of the sample gas in the reaction cell.
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