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2-5
Trace Oxygen Analyzer Operational Theory 2
Teledyne Analytical Instruments
Figure 2-3. Characteristic Input/Output Curve for a Micro-Fuel Cell
2.3 Sample System
The sample system delivers gases to the Micro-Fuel Cell sensor from
the analyzer gas panel inlets. Depending on the mode of operation either
sample or calibration gas is delivered.
The Model 3020T sample system is designed and fabricated to ensure
that the oxygen concentration of the gas is not altered as it travels through the
sample system. The sample encounters almost no dead space. This mini-
mizes residual gas pockets that can interfere with trace analysis.
The sample system for the standard instrument incorporates ¼ inch tube
fittings for sample inlet and outlet connections at the rear panel. For metric
system installations, 6 mm adapters are supplied with each instrument to be
used if needed. The sample or calibration gas flowing through the system is
monitored by a flowmeter downstream from the cell.