Ozone Sensors Explained: The Backbone of Modern Ozone Technologies

Author : Divya Kapoor | Published On : 10 Apr 2026

When it comes to any ozone generator, the first thing you think about is an ozone sensor. Without ozone sensors, any ozone device will fail to perform as intended. If you own a water treatment plant, a pharmaceutical company, or any production business, ozone sensors become essential parts of the process to keep everything efficient and safe.

Here is our detailed guide to industrial ozone sensors for everyone interested in ozone technologies.

Role of Ozone Sensors in an Ozone Technology Ecosystem

An ozone technology ecosystem cannot function based only on generation. You also need a reliable ozone sensor that will provide necessary measurements and information.

Ozone sensors constantly monitor ozone levels in the ambient air or dissolved ozone levels in water. They send all the gathered information to ozone controllers, which make sure ozone gas concentration remains within safe levels and adjust output power when needed.

Therefore, ozone sensors are a key component of any ozone technology ecosystem, providing information about current conditions that helps ensure safety and efficiency.

Types of Ozone Sensors Used in Ozone Technologies

Depending on your needs, an ozone technology specialist might recommend different ozone sensors from the following list of the most common ones.

Electrochemical ozone sensors are popular solutions for ambient air monitoring purposes. They are inexpensive, small in size, and very responsive, being suitable for detecting the slightest changes in ozone gas concentration. These sensors are widely used in ambient ozone monitors placed in plant rooms or other enclosed places.

Ultraviolet ozone sensors use UV light absorption method for detection, providing highly accurate results. However, it requires higher maintenance and calibration intervals than other methods but is a top choice for purified water analysis.

Semiconductor ozone sensors are also inexpensive options with limited accuracy used in portable ozone monitors.

Dissolved ozone sensors analyse the level of ozone in water. They are required for many water treatment, swimming pool cleaning, and beverage purification applications.

Working Mechanisms of Ozone Sensors and Their Principles

Each type of ozone sensor works according to its principle.

Electrochemical ozone sensors detect electrical currents formed during chemical reactions caused by ozone. Such sensors usually come with adjustable relays, digital displays, and alarm systems for real-time monitoring.

Ultraviolet ozone sensors direct a UV light beam toward ozone-containing water or gas to detect light absorption and measure concentration. This method provides high accuracy and is compatible with SCADA.

Both mentioned methods can be used with 4-20 mA output and RS-232 port integration, ensuring full compatibility with your industrial control system.

Industrial Applications of Ozone Sensors

The uses of ozone sensors are quite diverse, including applications in water treatment, air purification, surface sanitisation, healthcare, and even industrial processes such as wastewater treatment.

In the water treatment industry, dissolved ozone sensors verify residual ozone levels to confirm that a proper CT factor is achieved, thus eliminating pathogens.

In air purification systems and other ozone generators for surface sanitisation purposes, ozone sensors ensure that the gas concentration does not exceed the OSHA-approved limit of 0.1 ppm.

In pharmaceutical facilities, ozone sensors help ensure water quality and prevent contamination during production.

In the food and beverage industry, ozone sensors make sure ozone dosing does not exceed legal requirements and achieves desired results regarding pathogen reduction.

In water treatment plants, ozone sensors allow for maintaining the appropriate ozone dosage to minimise COD, remove odours, and change the colours of water.

Accuracy Factors and Calibration Requirements

Many factors can impact the accuracy of ozone sensors. Let's consider them now.

The most important factor affecting the accuracy of your ozone sensors is temperature. Therefore, it is crucial to choose industrial ozone sensors that come with built-in temperature compensation functions.

Humidity affects the accuracy of electrochemical ozone sensors due to condensation issues. If humidity is low, this is not a problem.

Other oxidants in the atmosphere, like chlorine dioxide, might affect electrochemical ozone sensors' performance, causing false readings. Choosing the right ozone sensor according to your environment can solve the issue.

Also, regular calibration every six to twelve months according to manufacturers' recommendations will keep your ozone sensors accurate.

Which Ozone Sensors Are Best for My Application

As always, selecting ozone sensors starts with determining your actual requirements.

First of all, find out whether your ozone sensor needs to detect ozone in the ambient air or dissolved ozone in water.

Then, determine the required range of concentration for your application along with possible temperature and humidity conditions.

Finally, consider the control system and its requirements in terms of analogue outputs and RS 232 communication.

Plant rooms and other enclosed areas will benefit most from an industrial ozone monitor featuring adjustable relays and a digital display inside its durable NEMA-rated enclosure.

If your process involves purified water, go with an ozone analyser using ultraviolet light for analysis.

Finding Reliable Ozone Sensors and Technologies Solutions

OTSIL is a professional ozone system provider with over 30 years of experience and more than 3000 successful installations worldwide. We supply highly precise ozone sensors and analysers and ozone generation units as part of our full range of ozone technologies.

Conclusion: Enhance Your Ozone Process with Purpose-Built Sensors

Ozone technologies rely heavily on sensors that ensure the safe operation of your facility. Proper selection, calibration, and usage are the main keys to success. Learn how you can enhance your ozone-related process with ozone sensors provided by an ozone manufacturer.

FAQ Everything About Ozone Sensors in One Place

1. What is the average lifespan of an ozone sensor?

The average service life of most industrial ozone sensors lies in the range from two to five years. However, the exact lifespan depends on many factors ozone concentration in the air, environmental conditions. Electrochemical sensors usually do not have as long a service life as UV sensors due to chemical reactions.

2. How often do ozone sensors need to be calibrated?

For most industrial ozone systems, the optimal calibration interval is every six to twelve months, but this value depends on the nature of your process. Higher ozone concentration requires more frequent checks. Use certified reference standards for calibration.

3. What maintenance is required for an ozone sensor?

Routine ozone sensor maintenance includes checking the integrity of its enclosure, relay operation, alarm functioning, analogue output signals, and calibration. Moreover, ozone sensors usually feature self-diagnosis capabilities, so they notify you if anything goes wrong.

4. How do I select ozone sensors?

The most important aspects of ozone sensor selection are their purpose, detecting either gas or dissolved ozone; their range; environmental conditions; and compatibility with your control system. An ozone technology expert can help you avoid errors and pick the best ozone sensors available.

5. Can my ozone sensors integrate into an existing SCADA or PLC ?

Most ozone sensors offer 4 to 20 mA analogue output and RS 232 serial interface, which allows integration into SCADA or PLC of many brands. Some ozone sensors also offer advanced options such as Modbus or digital IO configuration.