Teledyne 3000ZA - Trace oxygen analyzer - Manual (Page 21)

Trace Oxygen Analyzer Operational Theory
Teledyne Analytical Instruments 9
2.3 Sample System
The sample system delivers gases to the ZrO
2
sensor from the
analyzer rear panel inlet. Depending on the mode of operation either
sample or calibration gas is delivered.
The Model 3000ZA 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 system for the standard instrument incorporates
compression tube fittings for sample inlet and 1/4” outlet tube
connections at the rear panel. The sample or calibration gas that flows
through the system is monitored by a flowmeter downstream from the
cell. Figure 2-1 shows the piping layout for the standard model.
Figure 2-2 shows the flow diagram for sampling systems used for
the three configurations offered as options for this instrument. In the
standard instrument, calibration gases can be connected directly to the
Sample In port by teeing to the port with appropriate valves.
Figure 2-1: Model 3000ZA Sample System