A A level transmitter is a measuring instrument that converts liquid level changes into a standard electrical signal output, which is widely used for level measurement and control in various industrial settings. It converts the liquid level change into an electrical signal by contacting the sensitive element (such as float, capacitor, ultrasonic wave, etc.) with the measured liquid, and then amplifies and linearizes the signal through the electronic circuit, and finally outputs a standard electrical signal (such as 4-20mA, 0-10V, etc.).

A Negative Oxygen Ion Sensor is a device that can display the concentration of negative oxygen ions in the air, which is mainly used in forestry, environmental protection, meteorology and tourism units for monitoring negative oxygen ions in the air. It can help to improve the air quality in rural and urban areas. Negative oxygen ion sensors have a variety of detection principles and structure types, such as parallel electric plate sensors and double cylindrical shaft sensors.

A A carbon monoxide sensor is a sensor used to detect the concentration of carbon monoxide gas, which belongs to the category of chemical sensors. It usually uses electrochemical, semiconductor or infrared technology to convert the concentration of carbon monoxide gas into an electrical signal or other measurable signal output. Carbon monoxide sensors are characterized by high sensitivity, fast response, and a wide range of application areas, and are commonly used in mines, automobiles, homes, and other safety detection places.

A Sulfur dioxide sensor is mainly used for detecting the concentration of sulfur dioxide in the air, which is characterized by high current sensitivity, short response time, small influence by temperature and humidity, and good stability. It can not only determine the sulfur dioxide in the air, but also can be used to determine the sulfur dioxide in low conductivity liquid. Sulfur dioxide sensors have a wide range of applications in environmental monitoring, industrial emission control and other fields.

A Nitrogen dioxide sensors are used to detect the concentration of nitrogen dioxide in the environment. These sensors are characterized by high sensitivity and fast response, can accurately measure the concentration of nitrogen dioxide, and play an important role in industrial emission monitoring, air quality testing and other fields. For example, SST's NO2-A1 portable nitrogen dioxide sensor has no filter, a two-year lifespan, and is suitable for industrial environments.

A An ozone sensor is a device that converts information about the composition and concentration of ozone gas into information that can be utilized by personnel, instrumentation, computers, and so on. Its main characteristics include high sensitivity, high selectivity, and good stability. Common types of ozone sensors include semiconductor ozone sensors, electrochemical ozone sensors, solid electrolyte ozone sensors, and optical ozone sensors. These sensors have a wide range of applications in areas such as environmental monitoring and food safety testing.

A Doppler ultrasonic flowmeter is a kind of flowmeter that utilizes the physical principle of Doppler frequency shift to measure the speed of water flow. It uses an ultrasonic transmitter to emit sound waves, which are reflected back by solid particles or bubbles in the fluid. Due to the relative motion between the solid particles or bubbles in the fluid and the transmitter, the frequency of the received sound waves changes, i.e., the Doppler shift. This frequency shift is directly proportional to the flow rate of the fluid, and by measuring the frequency shift, the flow rate of the fluid can be calculated, and then get the flow rate. Doppler ultrasonic flowmeter is especially suitable for measuring fluids containing solid particles or air bubbles, such as municipal wastewater, sludge, etc.

A Doppler ultrasonic flowmeter is a kind of flowmeter that utilizes the physical principle of Doppler frequency shift to measure the speed of water flow. It uses an ultrasonic transmitter to emit sound waves, which are reflected back by solid particles or bubbles in the fluid. Due to the relative motion between the solid particles or bubbles in the fluid and the transmitter, the frequency of the received sound waves changes, i.e., the Doppler shift. This frequency shift is directly proportional to the flow rate of the fluid, and by measuring the frequency shift, the flow rate of the fluid can be calculated, and then get the flow rate. Doppler ultrasonic flowmeter is especially suitable for measuring fluids containing solid particles or air bubbles, such as municipal wastewater, sludge, etc.

A Radar Level Gauge is a measuring instrument based on the principle of time travel, which measures the level of materials (such as liquids, slurries and granular materials) by transmitting high-frequency microwave pulses and receiving their echoes. The radar wave runs at the speed of light and reflects back when it encounters the surface of the material. The distance is calculated by measuring the time difference between the pulse being transmitted and received, and then the level is obtained. Radar level meter has the advantages of corrosion-resistant, high pressure-resistant, high temperature-resistant, etc. It is suitable for liquid level measurement under various complicated working conditions, such as oil storage tanks, reactors and so on.

A Input level meter, also known as hydrostatic level meter or level transmitter, is a kind of liquid level meter that puts the sensor part directly into the medium for measurement. It utilizes the relationship that the static pressure of the liquid is proportional to the height, and converts the static pressure into an electrical signal through the sensitive element (such as diffusion silicon or ceramic material), and outputs a standard electrical signal under the effect of temperature compensation and linearity correction, so as to calculate the height of the liquid level. The input level meter is suitable for liquid level measurement in petrochemical, metallurgy and electric power, sewage treatment, urban water supply and drainage, etc. It has the advantages of high accuracy, stable performance and strong anti-interference ability.