Teledyne 3000ZA2G - Zirconium oxide analyzer - Manual (Page 23)

Trace Oxygen Analyzer Operational Theory
Teledyne Analytical Instruments 11
Figure 2-3: Flow Diagram
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
2
S, 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 3000ZA2G 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 (110/230 VAC) is user selectable from an internal switch.
It is set at the factory for your specific requirement. Figure 2-4 shows the
location of the power supply and the main electronic PC boards.
The signal processing electronics including the microprocessor,
analog to digital (ADC), and digital to analog (DAC) converters are
located on the motherboard at the bottom of the case. The preamplifier
board is mounted on top of the motherboard as shown in the figure.