Input type liquid level transmitter with display

Input type liquid level transmitter with display

Input type liquid level sensor is a pressure sensor for measuring liquid level. Based on the principle that the measured liquid static pressure is proportional to the height of the liquid, the sensor is assembled with isolated diffusion silicon sensitive elements. The static pressure is converted into an electrical signal, which is then temperature compensated and linearly corrected to convert it into a standard electrical signal. It is generally suitable for liquid level measurement of various media in systems and industries such as petrochemicals, metallurgy, power, pharmaceuticals, water supply and drainage, and environmental protection.

The input type liquid level transmitter is based on the principle that the measured liquid static pressure is proportional to the height of the liquid, and uses the piezoresistive effect of diffused silicon elements to convert the static pressure into an electrical signal. After temperature compensation and linear correction. Convert to 4-20mADC standard current signal output. The sensor part of the immersion type liquid level transmitter can be directly immersed in the liquid, and the transmitter part can be fixed with flanges or brackets, making installation and use extremely convenient.

Working principle

Principle of static pressure measurement:

The formula of pressure applied to the inlet surface of the sensor at a depth of the measured liquid is: rho = rho.g.H + Po

Formula:

P: Pressure on the liquid surface of the transmitter

ρ : density of the measured liquid

g: Local acceleration of gravity

Po: atmospheric pressure at the liquid surface

H: The depth of the transmitter into the liquid

At the same time, the liquid pressure is introduced into the positive pressure chamber of the sensor through the gas conductive stainless steel, and then the atmospheric pressure Po on the liquid surface is connected with the negative pressure chamber of the sensor to offset the Po on the back of the sensor, so that the sensor can measure the pressure of ρ.g.H, obviously, by measuring the pressure P, the liquid level depth can be obtained.

The figure shows the liquid level transmitter, which can monitor the situation of the site in real time and bring great convenience to the statistics of the staff.

The input type liquid level transmitter is widely used for liquid level measurement and control in rivers, groundwater levels, reservoirs, water towers, and containers. It is a sensor that measures the pressure of a liquid and converts it into a liquid level. The principle is that the measured liquid static pressure is proportional to the height of the liquid. The input type liquid level transmitter can be divided into two types: whether it needs to have a display and whether it needs remote transmission. The sensor core is usually made of diffused silicon, which has the characteristics of high measurement accuracy, compact structure, and good stability.

When choosing an input type liquid level transmitter, the application scenario should be considered first. If it is used in a corrosive environment, a high protection level and anti-corrosion sensor should be selected. Attention should also be paid to the size of the liquid level sensor range and the requirements of the interface. Input type transmission sensors are widely used for measuring liquid levels in water plants, sewage treatment plants, urban water supply, high-rise water tanks, wells, mines, industrial water tanks, water tanks, oil tanks, oil tanks, hydrogeology, reservoirs, rivers, oceans and other occasions.

Installation Tip:

1. When measuring the water level in flowing water, if the medium fluctuates greatly, a steel pipe with an inner diameter of about 5 centimeters can be inserted into the waterway. Several small holes with a diameter of about 5 centimeters can be opened at different heights in the opposite direction of the water flow direction of the pipe that invades the water, allowing water to enter the pipe. The cable and junction box can be fixed at the outlet of the pipe.

2. When the water channel medium fluctuates and sediment is large, it is also possible to filter sediment and eliminate the adverse effects of dynamic pressure and waves by installing damping devices to ensure measurement accuracy.

3. When installing the product in areas with frequent lightning strikes, it is recommended to indicate "lightning protection" when ordering. At the same time, it is suggested that users install lightning protection devices on site and ensure reliable grounding of the product and power supply to reduce the probability of lightning damage to the transmitter.