Dissolved Ozone Measurement

In Water Used to Produce Personal Care Products

Dissolved ozone plays a critical role in personal care product water systems, where it is used for disinfection and sanitization of water and process equipment. While ozone effectively eliminates microbiological contamination, it must be carefully monitored to ensure adequate concentrations during sanitization and complete removal before water is used in production. Reliable dissolved ozone measurement enables effective process control, supports product quality, and helps maintain safe and compliant manufacturing operations.

Ozone (O₃) is an unstable triatomic form of oxygen. It is a very strong oxidizing gas that is injected into water to remove organics that may contribute color, odor or taste variations. Most importantly, ozone sanitizes the water, rapidly destroying any microbiological contamination. Dissolved ozone reverts back to harmless oxygen in a matter of minutes, depending on the temperature and pH of the water, so it must be generated and measured very close to the process. The pureO₃ sensor provides real-time ozone measurements for ensuring disinfection is complete.

Many ozone generators operate by passing dry air or oxygen next to high-voltage electrodes where a corona discharge converts some of the oxygen to ozone, similar to the reaction caused by a lightning storm. The gas mixture is then contacted with the water, either in a tank diffusion system or in a pipe with a venturi injector. Intimate contact is made to maximize the dissolution. There are newer generation techniques that can produce ozone directly in the water and reduce the possibility of atmospheric losses.

Ozone is an excellent material for disinfecting and sanitizing personal care product water systems. However, it is an undesirable addition to point of use personal care product water. In order to eliminate the ozone, an ultra-violet (UV) light source is employed to effectively destroy it after the disinfection process is complete. The UV light also has the added benefit of providing further disinfection.

Clean-in-Place (CIP)

Increasingly, ozone is being used in personal care product manufacturing processes to sanitize piping systems and to reduce biofilm quicker and at lower cost than heat or chemicals. Also, ozone breaks down into harmless oxygen eliminating the cost of chemical neutralization and disposal.

Dissolved Ozone Measurement

Online monitoring and control of ozonation have now become standard practice. In personal care product water applications, ozone monitoring is required at three critical measurement points in the water system, as seen in figure 1.

Ozone sensor #1.

The ozone concentration is measured after the storage tank to ensure the proper concentration of ozone is achieved for effective disinfection action at the storage tank.

Ozone sensor #2.

Ozone is measured in this area to ensure destruction of the ozone by the UV light and to confirm that the water utilized in production is sufficiently free of ozone at the points of use.

Ozone sensor #3.

This post point-of-use sensor measures the ozone concentration to ensure that adequate levels are achieved during sanitiza tion of the water system when the UV is off or bypassed

pureO₃ Ozone Sensor

High accuracy at very low ppb ozone concentrations
Reinforced silicone membrane for exceptional durability and repeatability
Fast response: 30 seconds for 90%
Plug and Measure start up
Advanced predictive diagnostics

Stable and repeatable ozone determination

METTLER TOLEDO Thornton’s robust pureO₃ ™ sensor with Intelligent Sensor Management (ISM®) provides stable and repeatable measurements for determining ozone oxidation levels to ensure complete sanitization. The same pureO₃ sensor also measures trace levels of dissolved ozone to confirm that all ozone is destroyed after sanitization and prior to water distribution and use

Lower operating costs

ISM is a unique feature to METTLER TOLEDO. ISM technology provides precalibrated sensors for fast, error-free start-up, and greater process reliability with advanced sensor diagnostics. In addition, ISM offers predictive diagnostics for longer uptime and more efficient routine maintenance which can be scheduled in advance, eliminating unexpect ed measurement point downtime. ISM’s features decrease operational costs and simplify sensor handling while allowing operators to make more informed decisions about process conditions.

When coupled with an innovative transmitter from METTLER TOLEDO such as the multi-parameter, multi-channel M800, the pureO₃ measurement solution conveniently provides state-of-the-art dissolved ozone monitoring and control to optimize plant performance and compliance.

For personal care product water applications, the METTLER TOLEDO M300 Water and M200 provide one- or two-channel measurement of dissolved ozone and conductivity. These are the most cost-effective choices where few measurement points are required.

Multi-parameter Measurements

To meet the requirement for many measure ment points, the METTLER TOLEDO M800 Water 4-Channel transmitter can accept up to four sensors in any combination of ozone, dissolved oxygen, pH, TOC and conductivity. See table 1 for details.

Personal care product water production is a challenging measurement environment, and the M800 Water provides unequaled flexibility and value in satisfying measurement needs where multiple parameters and monitoring points are required.

Now that you've learned how dissolved ozone measurement helps ensure effective sanitization, protect product quality, and maintain compliance in personal care product water systems, download the full Application Note for a deeper look at ozone-based disinfection, critical measurement points, and the advantages of continuous online monitoring.

Discover how accurate, real-time ozone measurements can help optimize sanitization processes, verify ozone destruction before production use, reduce operating costs, and improve overall process reliability.