The Model UV-106-W Aqueous Ozone Monitor™ uses our patented MicroSparge™ technology to measure dissolved ozone in water with high precision and accuracy. Unlike most dissolved ozone sensors, the instrument does not make use of a membrane that will foul over time. Instead, dissolved ozone is measured by nearly complete sparging (bubbling) of ~2 mL of water with ozone-scrubbed ambient air and integrating the gas-phase concentration of ozone stripped from solution. A small correction, based on the temporal profile of ozone removed from solution, is made to account for any ozone remaining in solution. Because ozone is measured in the gas phase, interferences from particles and dissolved inorganic and organic compounds are removed, making the instrument applicable to both ultrapure water and “dirty” water, such as drinking water, which can contain a wide variety of dissolved inorganic and organic impurities and suspended particles.
Animation of the Model UV-106-W Operation :
The following is an animation showing the two steps involved in the measurement of dissolved ozone using the Model UV-106-W Aqueous Ozone Monitor. Each step lasts ~5 seconds, with a new ozone measurement being made and displayed every 10 seconds. In the first step, the Sample Loop is overfilled with the sample water while at the same time air pressure from the Air Pump is used to empty the Impinger, which contains water from the previous measurement. During this stage the light intensity (Io) is measured in the absence of ozone. The states of the 5 valves are then reversed and air forces ~2 mL of water from the Sample Loop into the Impinger and sparges the sample to remove ozone and carry it through the Optical Bench, where the temporal profile of ozone is measured over a period of ~5 seconds. The total mass of ozone present in the 2 mL of water is determined by integrating under the concentration profile and applying a small correction for ozone in the "tail" of the exponential decay curve. Dividing the mass of ozone by the mass of water in the Sample Loop and multiplying by 106 gives the ozone concentration in ppm (also g/m3 and µg/mL).
- Interference-free measurement of dissolved ozone in ultrapure or "dirty" water
- NEMA water-proof housing
- New measurement every 10 s
- Internal data logger logs 16,383 lines of data
- Precision and accuracy of 0.05 ppm or 1% of reading
- Both serial and user-scaleable analog outputs (0-2.5 V and 4-20 mA)
- Selectable data averaging times of 10 s, 1 min, 5 min and 1 hr (custom averaging times available)
- LED alarms
- Available with AC or DC power connections
Breakout box for power, RS232, 0-2.5 V and 4-20 mA connectors, and 2 relays.