How it works
Static pressure measurement principle: when the liquid level sensor is put into a certain depth in the liquid to be measured, the pressure formula on the liquid surface of the sensor is: Ρ = ρ .g.H + Po where: P: the pressure on the liquid surface of the transmitter ρ: the density of the liquid to be measured g: local gravitational acceleration Po: atmospheric pressure on the liquid surface H: the depth at which the transmitter is put into the liquid At the same time, the pressure of the liquid is introduced into the positive pressure cavity of the sensor through the conductive stainless steel, and then the atmospheric pressure Po on the liquid surface is connected to the negative pressure cavity of the sensor to cancel the Po on the back of the sensor , so that the sensor measures the pressure as: ρ .g.H , obviously, after measuring the pressure P, the depth of the liquid level can be obtained.
Features:
Good stability, fullness, zero long-term stability up to 0.1%FS/year. The temperature drift is less than 0.1%FS in the compensation temperature range of 0 - 70 °C, and less than 0.3%FS in the whole permissible operating temperature scale.
With reverse maintenance and current limiting maintenance circuit, the transmitter will not be damaged when the positive and negative poles are reversed during installation, and the transmitter will automatically limit the current within 35MA when abnormal.
Solid structure, no moving parts, high reliability, long service life.
It is easy to install, simple in structure, economical and durable.
The main types of liquid level sensors and their use
The main types of liquid level sensors are ultrasonic liquid level sensors, capacitive liquid level sensors, photoelectric liquid level sensors, microwave optical sensors, etc., which are used as follows:
Ultrasonic level sensor: used to detect the content of viscous liquid substances and the content of volumetric substances. They work by generating audio waves with a frequency scale of 20 to 200 kHz, which are then copied back into transducers. The response of ultrasonic sensors is affected by turbulence, pressure, humidity and temperature. In addition, transducers must be added appropriately for better response. It can be used to control levels, fine-grained solids in mining and powder, food and beverage occupations, and chemical processing.
Capacitive liquid level sensor: used to detect the change of liquid level like mud and aqueous solution, the sensor is made of polytetrafluoroethylene insulated wire probe to view the liquid level change, the use of the change of liquid level to cause the capacitance change, according to the detected capacitance value to determine whether the sensor is located in the water condition or no water condition. However, stainless steel probes have a very high degree of responsiveness, making them suitable for measuring particles of non-conductive substances or materials with a low dielectric constant. These types of sensors are very easy to apply and clean, as they do not have any moving components. They are generally used for chemical, water treatment, food, battery occupations, etc., involving high pressure and high temperatures.
Photoelectric level sensor: used to detect liquids, containing stable substances, the interface between two immiscible liquids and the presence of deposits. Their operation is based on the alteration of the transmission of infrared light emitted by infrared LEDs. Using high-energy infrared diodes and pulse modulation methods, it is possible to reduce the disturbance generated by light. Photoelectric level sensors, on the other hand, use high-intensity lasers that can be injected into dusty environments and notice liquid substances. They are typically used for leak detection and tank level measurement, among other things.
Microwave Optical Sensors: This type of sensor is suitable for different temperatures, pressures, dirty and humid environments, as microwaves can easily pass through these conditions without involving the transmission of energy from air molecules. Microwave optical sensors can detect conductive water and metallic substances. Measurements can be made using the time domain or pulse reflectometry method. They are generally used in applications such as vapor, humid and dusty environments. They are also used in systems with different temperatures.
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