Overview | 1-3
Sample Flow
The sample gas is drawn from the sample stream through the ASR900
Sample Probe and Sample Line to the dual-chambered Measuring Cell. The
gas sample enters the first chamber, flows the length of the Measuring Cell,
crosses to the second chamber, flows the length of the Measuring Cell in the
opposite direction and exits the Measuring Cell. From the Measuring Cell,
the sample gas flows through the Vent Line back to the sample stream via
the ASR900 Probe. An Aspirator in the sample return portion of the ASR900
Probe provides the means of creating flow through the sample system.
About the Analyzer Sample System
The sample system consists of (Figures 1-2 and 1-3):
Component Function
Sample Path
Sample Line This heated line transports the sample gas to the analyzer at a
temperature above its dewpoint.
Aspirator Located within the ASR900 Sample Probe, the Aspirator uses
Instrument Air to create a small vacuum that moves the sample
gas from the extraction point, through the sample system, and
returns it to the sample stream through the Sample Probe.
Inspection Tube Provides a visual indicator of any contamination of the sample
path.
Measuring (Sample) Cell
This is where the actual measurement takes place.
Calibration Manifold (Solenoid Block)
Connection point for the Vent Line, calibration gas, and sample
path. Preheats calibration gases.
Vent Line This heated line returns the sample gas to the extraction point
via the ASR900 Sample Probe at a temperature above its
dewpoint.
ASR900 Sample Probe
The Probe end extends into the process/tail gas stream to
obtain a representative sample. Its ameproof heater maintains
the Sample Probe temperature at 130 °C (266 °F). See also
ASR900 Sample Probe Installation and Maintenance Guide.
Pressure Transducer Connection
Trickle Purge Flow Provides a small ow of air to keep the line between the
pressure transducer and the Calibration Manifold (Solenoid
Block) free of condensation.
Pressure Transducer Measures the pressure of the sample gas in the Measuring Cell.
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