Aeroqual offers two different sensor types for ozone measurement in our sensor head range:
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Gas sensitive semiconductor (GSS) sensor
Gas sensitive electrochemical (GSE) sensor
The GSS sensor is manufactured by Aeroqual. The sensing material is an n-type semiconductor whose resistance increases when the sensing layer is exposed to an oxidizing gas such as ozone. Selectivity towards ozone is achieved through careful control of the sensor material and operating temperature. Like the ozone module, the GSS ozone sensor head goes through a zero cycle to improve accuracy and baseline stability. The sensor resistance is measured during the zero and measurement states, and these values are used to calculate the O3 concentration using a proprietary algorithm approximately once per minute. The GSS sensor head gives good accuracy, sensitivity, and stability at low ozone concentrations.
The GSE sensor head incorporates an electrochemical gas sensor. This sensor generates an electrical current in nA, which is proportional to the concentration of gas that comes in to contact with the sensor. The sensor current is converted to a voltage and this voltage is used to calculate the ozone concentration. The GSE sensor head has a faster response time than the GSS sensor head. The GSE sensor head can also be used across a wider concentration range. The GSS ozone sensor is affected by volatile organic compounds (VOCs) while the GSE sensors are cross sensitive to NO2 and Cl2.
The GSE sensor head is therefore more suitable for indoor applications, while the GSS sensor head is more suitable for outdoor applications.
The table below highlights the differences between the two sensors:
GSE (indoor)
GSS (outdoor)
Range
0-30 ppm (EOZ/EOZH)
0-0.5 ppm (OZS/OZU/OZL)
Detection Limit
0.01 ppm
0.001 ppm
Resolution
0.01 ppm
0.001 ppm
Response time
60 seconds
60-240 seconds
Zero
No
Yes
Main cross sensitivities
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NO2 and Cl2
VOCs
Of all the gases you can measure, ozone may be the most difficult.
Ozone is a highly reactive and unstable gas made up of three oxygen atoms (O3). Its unique physical nature means it can easily decay due to temperature, humidity, time, or air agitation, making it difficult to consistently measure.
However, ozone monitoring and measuring is the most efficient way to detect the accumulation of high levels of ozone in the air&#;a requirement for professionals in a variety of industries.
Ozone monitoring is the use of ozone gas detectors to measure the concentration of ozone in the air or in water. These analyzers can calculate ozone levels as needed for industrial applications or can be used to monitor ozone levels regularly to check if air is meeting air quality standards.
After determining the levels of ozone in the air, the measurement can be used to calculate the air quality index or formulate a plan to meet industry standards.
Although ozone in the atmosphere high above Earth protects the planet from the sun&#;s harmful ultraviolet (UV) rays, high concentrations of ground-level ozone can be harmful.
An efficient ozone monitoring system makes it easier to find areas of high ozone levels and determine how to mitigate the effects of the gas on people, animals, and plants.
Even low concentrations of ozone can cause a variety of health effects, including itchy eyes, irritation to the nose and throat, shortness of breath, chest pain, and coughing. It can also aggravate asthma or bronchitis as well as reduce lung capacity. On days when ozone levels are high, there are also increased hospitalizations for respiratory conditions.
People at the greatest risk of harm from breathing air containing high levels of ozone are those with asthma; people suffering from heart, high blood pressure, or lung disease; the elderly; and children.
Health advisories are issued on days when concentrations of ozone in the air are expected to cause detrimental health effects.
High concentrations of ground-level ozone can negatively impact the health of trees and plants. It interferes with photosynthesis, impairs plant growth, and makes plants more vulnerable to disease as well as insects. Additionally, ozone is the main ingredient in smog&#;a mixture of air pollutants produced by the reaction between sunlight and air contaminants such as automobile exhausts.
Sensitive ecosystems, including parks, wildlife refuges, forests, and wilderness areas are especially sensitive to higher ozone levels.
Ozone levels in the air or water are measured with different types of ozone monitoring equipment. These devices can cost between $300 and $5,000 to purchase, depending on the brand and purpose of the instrument.
UV absorption technology is used to detect low levels of ozone in the parts per billion (ppb) range. The ozone monitor takes an air sample and exposes it to UV light. Any ozone molecules in the sample will absorb the UV light&#;that change in light absorption is measured by photodetectors and is proportionate to the concentration of ozone.
This type of ozone monitoring equipment the most widely used and, at the same time, more expensive than other devices.
Metal oxide semiconductor ozone monitors are another common type of ozone monitoring instrument. When the monitor is exposed to an air sample, any present ozone molecules react to the semiconductor&#;s metal oxide and alter the resistance of the surface. This interaction is measured, and the resulting measurement is converted into an ozone concentration level.
Electrochemical ozone monitoring devices use electrochemical sensors to determine levels of ozone in the sample. When the gas is diffused into the sensor, the instrument produces electric signals in proportion to the ozone concentration in the air sample.
These low-cost ozone gas devices are useful for measuring ozone levels in the parts per million (ppm) range.
Several companies have created ozone monitoring equipment that effectively tests the levels of ozone gas present in air or water. Here are our favorites from RAECO Rents.
At RAECO Rents, we have the latest ozone monitoring equipment for industry professionals. Our goal is to provide the devices you need so you can get the job done quickly, effectively, and more affordably than ever.
When you rent equipment from RAECO Rents, you can expect to get clean, operable, high-quality instruments. With our Instant-On guarantee and after-hour support, we are determined to make your rental experience easy.
Contact our rental service team today to get help finding industry-leading ozone monitoring equipment.