Liquid sensor

Introduction: Overview of Liquid Level Sensor The liquid level sensor adopts an imported oil filled diffusion silicon chip and a 316L stainless steel fully sealed welding structure design, which has moisture-proof performance and medium compatibility, and can be used in weakly corrosive media in industrial applications; Key components and pressure sensors in the circuit section

Overview of Liquid Level Sensor

The liquid level sensor adopts imported oil filled diffusion silicon chip and 316L stainless steel fully sealed welding structure design, which has moisture-proof performance and medium compatibility, and can be used in weakly corrosive media in industrial occasions; Circuit Department

The key components and pressure-sensitive cores are divided, and the selected components adopt production standard processes to ensure that all technical indicators of the product are flat, and the product has good stability and accuracy.

Structural principle of liquid level sensor

The liquid level sensor determines the liquid level height by measuring the static pressure generated by the liquid level. The hydrostatic pressure of a liquid is represented by the formula P=Po+р gh, where Po is the atmospheric pressure at the upper part of the liquid surface and р is the measured liquid

Density, H is the height of the liquid, and g is the gravitational acceleration (constant). When Po remains constant, the pressure depends on two variables: density and liquid level. When the liquid density is a certain value, the liquid level will be proportional to the pressure

Establish a linear relationship. This pressure acts on the sensing surface of the transmitter diffusion silicon pressure sensor, and through the piezoresistive effect of the sensor, the liquid column pressure is converted into a voltage signal. This signal is amplified directly

Convert to 4~20mA. If there is a change in atmospheric pressure above the liquid level, the pressure sensor will be affected in the same way as the liquid level changes.

Application scope of liquid level sensor

Applied to water plants, sewage treatment plants, urban water supply, high-rise water tanks, wells, mines, industrial water tanks, water tanks, oil tanks, hydrogeology, reservoirs, rivers, oceans and other places.

Liquid level sensor parameters

◆ Fully enclosed circuit with moisture-proof, anti condensation, and anti leakage functions

◆ Split type

Accuracy: 0.25% FS

Power supply: 24VDC

The external dimensions are approximately 110mm in length and 26mm in diameter

Output: 4-20mA, 0-5VDC 0-10VDC

Working temperature: -20 ℃ to+80 ℃

◆ Suitable for liquid level measurement

◆ Sealing level: IP68

Measurement form and range: 0~1~200m H2O

◆ Allowable overload: 2 times the full range pressure

◆ Temperature compensation: -10~70 ℃

Storage temperature: -40~80 ℃

Power supply: 15-36 VDC (calibrated voltage 24VDC)

◆ Shell material: 304 stainless steel O-ring fluororubber

◆ Cable: Special waterproof and breathable cable

Installation and use of liquid level sensor:

When measuring static liquid level in an open container, place the liquid level transmitter directly into the bottom of the container, and fix the cable (junction box) at the opening of the container with nylon tape or a three legged adjustable mounting bracket.

When measuring the liquid level in a flowing liquid, due to the large fluctuation of the medium, a Φ 45mm steel pipe can be inserted into the liquid, and several small holes can be drilled on the pipe wall at different heights on the opposite side of the water flow direction,

Make the liquid flow into the tube. Another method is to install damping devices at the bottom of the liquid to filter sediment and eliminate the influence of dynamic pressure and waves on the measurement.