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Ozone water tester

Ozone water tester:
Concentration mathematical calculation model
The ozone concentration mathematical model (formula) is introduced according to Lambert and Beer's law.
1.3 schematic circuit implementations: basic circuit from the power section, the UV lamp control sampling and testing, sample testing of ultraviolet light, ultraviolet light, the logarithmic amplifier Log100, analog output and six major components.
The circuit core part is the mathematical model of the ozone concentration of logarithmic amplifier Log100 to. The LOG100 are 14 pins can be the ratio of two current or voltage as a logarithmic calculation of integrated circuits, a wide dynamic range of the amplifier output current, and can vary between 1nA to 1mA. The output range of error does not exceed 0.1%. Basic wiring
Output formula: Vout = VT × ln I0 / I (Note: VT --- constant output voltage; Vout ---).
The power supply portion mainly generating ultraviolet lamps require high-voltage power supply, while producing a circuit board, the +15 V DC. UV lamp lighting control some of the major control UV light lamp current, constant allowable range is too high, too low, you can automatically adjust If you can not adjust to the life of the UV lamp, a red light lit on the panel, suggesting that you should replace new UV lamp. Standard UV detection and sampling UV detection section is more critical part of a photoelectric sensor to ultraviolet optical signal is converted into a voltage signal, and then signal finishing amplification by the operational amplifier twice, gave LOG100 calculation processing, display output. 0 ~ 20mA analog output size is a linear relationship with the concentration of ozone.
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