Zirconium Oxide Sensor Application Notes; Electronics And Signal Processing; Figure 2-3: Flow Diagram - Teledyne 3000ZA2G Operating Instructions Manual

Trace Oxygen Analyzer
The sample system for the standard instrument incorporates 1/8"
tube fittings for sample inlet and outlet at the rear panel. The sample or
calibration gas that flows through the system is monitored by a
flowmeter downstream from the cell.
Figure 2-3 shows the flow diagram with an optional gas manifold.
In the standard instrument, calibration gases can be connected directly to
the Sample In port by teeing to the port with appropriate valves.

2.4 Zirconium Oxide Sensor Application Notes

The following sample gases require conditioning prior to entering
the sensors:
Flammable gases such as methane, alcohol and carbon

monoxide may cause a measurement error. They must be
filtered from the sample gas before entering the cell.
Gases containing halogen atoms (F, Cl, Br, etc.) such as

Freon, must be filtered before entering the cell. The sensor
will be damaged by the decomposition of Freon.
Gases containing SOx, H

must not enter the sensor. These components adversely affect
the performance of the sensor.
Dust, particulates( >3 microns), and oil should be filtered

from the sample gas.
Water vapor in contact with the sensor will damage the

sensor. Use a moisture trap or filter to remove any water
vapor in the sample.

2.5 Electronics and Signal Processing

The Model 3000ZA2G Trace Oxygen Analyzer uses an 8031
microcontroller with 32 kB of RAM and 128 kB of ROM to control all
Teledyne Analytical Instruments

Figure 2-3: Flow Diagram

S, silicone vapor and adhesives
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Operational Theory
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