Teledyne 3000ZA Zirconium Oxide Sensor Application Notes, Electronics and Signal Processing

Operational Theory 3000ZA

Figure 2-2: Flow Diagram with Options

2.4 Zirconium Oxide Sensor Application Notes

The following sample gases require conditioning prior to entering the sensor:

•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, H2S, silicone vapor and adhesives must not enter the sensor. These components adversely affect the performance of the sensor.

•Dust 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 3000ZA Trace Oxygen Analyzer uses an 8031 microcontroller with 32 kB of RAM and 128 kB of ROM to control all signal processing, input/output, and display functions for the analyzer. System power is supplied from a universal power supply module designed to be compatible with any international power source. Figure 2-3 shows the location of the power supply and the main electronic PC boards.

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