O3 Sensors is the most effective method to detect ozone concentration.We all know that the chemical properties of ozone are extremely active. Its energy when it is free produces strong oxidation in an instant, which can sterilize, disinfect and detoxify. It is widely used in water plant sterilization and disinfection, tableware disinfection, indoor air purification, fruit, and vegetable preservation, there are also medical treatments, etc. But if the concentration of ozone is too high, it will cause great harm to human health. Therefore, whether it is to use the strong oxidizing property of ozone or prevent its harmfulness, it is inseparable from the monitoring of ozone concentration.
What is an ozone gas sensor?
An ozone sensor is a device that converts information such as the composition and concentration of ozone gas in the environment into information that can be used by personnel, instruments, computers, etc.
Ozone sensor advantages
High-density material shell, wall mounting, easy installation
Detachable probe to easily pass through a small hole with a diameter of 0.6cm
External waterproof probe
Principle of ozone meter
According to different detection principles, ozone meters can generally be divided into three types: ultraviolet, semiconductor, and electrochemistry。
Ultraviolet ozone meter working principle
Studies have shown that the 253.7nm ultraviolet light of ozone has a large absorption coefficient, and the ultraviolet light at this wavelength is attenuated by the ozone, which conforms to the Lambert-Beer law. The ozone gas meter adopts the principle of ultraviolet absorption. It uses a stable ultraviolet light source to generate ultraviolet light. The lightwave filter filters out other wavelengths of ultraviolet light, allowing only 253.7nm ultraviolet light to pass. After passing through the sample photoelectric sensor, it is absorbed by ozone to reach the sampling photoelectric For the sensor, the electrical signals of the sample photoelectric sensor and the sample photoelectric sensor are compared, and the mathematical model calculation is performed according to the Lambert-Beer law to obtain the ozone concentration.
Semiconductor ozone meter working principle
The semiconductor ozone sensor uses gas-sensitive semiconductor materials, such as WO3, Sn0, In203, and other pieces of oxide made of sensitive elements. When they absorb ozone, a redox reaction occurs, which generates or emits heat to make the element The temperature changes accordingly, and the resistance changes. The concentration of ozone is converted into an electrical signal to measure the concentration of ozone. Generally, as the lifted concentration increases, the resistance of the element increases significantly, and within a certain range, the relationship is linear.
Electrochemical ozone meter working principle
The electrochemical ozone sensor is composed of the working electrode, counter electrode, participating electrode, electrolyte, and circuit system. A constant potential value can be maintained between the working electrode and the participating electrode. When ozone diffuses into the sensor, a reduction reaction occurs at the working electrode, an oxidation reaction occurs on the electrode, and a tiny current is formed between the electricity price and the working electrode, and this current enters The ozone concentration of the sensor is proportional to a certain range, and finally processed by the circuit system to calculate the ozone content.
5 types of ozone meters suitable for different places
1. Wall-mounted ozone meter
This wall-mounted ozone sensor uses the principle of electrochemical detection to measure the concentration of the target gas by measuring the current generated when the chemical reaction occurs between the sensor and the sensing electrode. The reaction is rapid, sensitive and reliable for detecting ozone concentration. Shell adopts wall-mounted waterproof shell, easy installation, high degree of protection; The equipment adopts high sensitivity gas detection probe and high performance signal acquisition circuit, which can accurately measure the concentration of ppm ozone, stable signal and high precision. The device adopts 485 communication, standard Modbus-RTU communication protocol, communication address and baud rate can be set, and the farthest communication distance is 2000 meters. The equipment adopts 10-30V wide voltage power supply, the shell protection degree is high, can adapt to various harsh conditions on site.
2. Portable ozone meter
For professional gas safety inspection personnel, a portable ozone detector is essential. There are two types of portable ozone detectors: pumping type and diffusion type, which can be selected according to your needs. The portable ozone detector is designed to safely protect human life. It is small and lightweight and can be easily clipped in a belt, shirt pocket, or helmet to detect the concentration of ozone gas exposed to extreme environments. If the gas concentration of the detector in the air is too high, the ozone detector will send out a triple alarm signal of sound, light, and vibration at the first time, thereby effectively preventing the accident of poisoning caused by the excessive concentration of ozone gas in the air.
3. Fixed ozone meter
The fixed ozone meter is used for 24-hour online monitoring of the gas concentration in the environment or pipelines and alarms. On-site display of concentration and sound and light alarm, remote data transmission. This is a detector that is used more in industrial equipment and in the production process. It can be installed at a specific detection point to detect specific gas leaks. When in use, it should be selected according to the type and concentration of the gas on-site, and at the same time, attention should be paid to installing them in the most likely leaking part of the specific gas. For example, the most effective height of the sensor should be selected according to the specific gravity of the gas.
4. Duct type ozone meter
Pipe ozonometers are designed for plug – in pipe gas measurement. Stainless steel duct and stainless steel flange combined with the insertion structure, with professional ozone concentration sensor probe as the core detection device. The transmitter uses electrochemical technology to measure O3 concentration, which has rapid and sensitive response and reliable detection of ozone concentration. The transmitter is specialized for ozone concentration measurement in pipelines. The equipment adopts waterproof shell design, pipeline installation mode, easy installation on site, anti-interference circuit design, can withstand the field inverter and other strong electromagnetic interference.