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A to D Conversion ........................................................................................................................ 189
9.2.4.1.
Sensor Inputs ............................................................................................................................... 189 9.2.4.2.
Thermistor Interface ..................................................................................................................... 189 9.2.4.3.
Analog Outputs ............................................................................................................................ 189 9.2.4.4.
External Digital I/O ....................................................................................................................... 190 9.2.4.5.
I
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C Data Bus ................................................................................................................................ 190 9.2.4.6.
Power-up Circuit........................................................................................................................... 190 9.2.4.7.
Power Supply and Circuit Breaker ...................................................................................................... 190 9.2.5.
AC Power Configuration ...................................................................................................................... 192 9.2.6.
AC Configuration – Internal Pump (JP7) ..................................................................................... 193 9.2.6.1.
9.3. Front Panel Touchscreen/Display Interface .............................................................................................. 194
Front Panel Interface PCA ........................................................................................................... 195 9.3.1.1.
9.4. Software Operation .................................................................................................................................... 195
9.5. O
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Generator Operation ........................................................................................................................... 196
Principle of Photolytic O
3
Generation .................................................................................................. 196
9.5.1.
Generator Pneumatic Operation ......................................................................................................... 198 9.5.2.
O
3
Generator Electronic Operation ...................................................................................................... 198 9.5.3.
O
3
Generator Temperature Control ............................................................................................. 200 9.5.3.1.
9.6. Photometer Operation ............................................................................................................................... 200
Measurement Method ......................................................................................................................... 200 9.6.1.
Calculating O
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Concentration ....................................................................................................... 200 9.6.1.1.
The Measurement / Reference Cycle .......................................................................................... 202 9.6.1.2.
The Absorption Path .................................................................................................................... 204 9.6.1.3.
Interferent Rejection ..................................................................................................................... 205 9.6.1.4.
Photometer Layout .............................................................................................................................. 205 9.6.2.
Photometer Pneumatic Operation ....................................................................................................... 206 9.6.3.
Photometer Electronic Operation ........................................................................................................ 207 9.6.4.
O
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Photometer Temperature Control ........................................................................................... 207 9.6.4.1.
Pneumatic Sensors for the O
3
Photometer .................................................................................. 208
9.6.4.2.
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