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Trace Oxygen Analyzer Operational Theory
Teledyne Analytical Instruments 11
electronics is zeroed automatically when the instrument power is turned
on.)
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 rear panel inlet. Depending on the mode of operation
either sample or calibration gas is delivered.
The Model 3000TA 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 minimizes residual gas pockets that can interfere with trace
analysis.
The sample system for the standard instrument incorporates 1/4
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
flows through the system is monitored by a flowmeter downstream from