System Description
Software
Thermo Fisher Scientific Model 49i Primary Standard Instruction Manual 7-3
Ozonator Assembly The internal ozonator operates on the photolytic principle. The ozone level
produced is a function of light intensity at 185 nm and gas flow. The light
intensity is varied by changing the current into the lamp. The gas flow is
held constant by a pressure regulator followed by a capillary.
Ozonator Lamp Power
Supply
The ozonator lamp power supply generates high voltage AC and contains
heater control circuits for the ozonator lamp.
Photometer Lamp power
Supply
The photometer lamp power supply generates high voltage AC and contains
heater control circuits for the photometer lamp.
Optical Bench
Temperature Thermistor
The optical bench temperature thermistor is used for maintaining the
optical bench at a constant temperature.
Pump The pump draws the zero air through the optical bench.
Note Total flows of less than 1 LPM (2 scfh) should be avoided since the
flush time would be excessive. Total flows of greater than 3 LPM should also
be avoided since there would not be enough residence time in the converter
to ensure greater than 99% conversion of the ozone.
Sample/Reference
Solenoid Valves
The sample/reference solenoid valves allow sample gas to pass through Cell
A and reference gas through Cell B, or vise versa, depending upon which
cycle the instrument is performing.
Software The processor software tasks are organized into four areas:
• Instrument Control
• Monitoring Signals
• Measurement Calculations
• Output Communication
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