Principle of submersible level transmitters

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Product introduction: The submersible level transmitter is a hydrostatic level gauge that measures liquid levels using the principle of pressure. The sensors used are based on single-crystal silicon; advanced ion implantation and micro-mechanical processing techniques are employed to create silicon sensing elements with Wheatstone bridge and precision mechanical structures. The water pressure at the location of the sensor acts on the silicon sensing element through an interface, enabling a linear conversion between the applied pressure and the output signal; a laser-tuned thick-film resistor network compensates for the temperature sensitivity of the sensing element. The sensor measures the signal, and through a specialized signal conditioning circuit, it converts this signal into a standard 4-20mA current or RS485 signal for output, thereby enabling accurate measurement of the liquid level. Working principle: The submersible level transmitter is a type of underwater level sensor that measures liquid levels based on the principle of hydrostatic pressure. It is a two-wire hydrostatic level transmitter installed at the top of the container being monitored; it is simple to install and calibrate, and no need exists to empty the tank during installation. It is widely used for measuring liquid levels at atmospheric pressure; the circuit is enclosed at the top of the container being measured, separated from the liquid, thereby enhancing its reliability and safety. Furthermore, the gas collector is designed with temperature compensation and anti-fouling features, which effectively prevent blockages and scaling. The independence of these functions from those related to zero-point and range adjustment makes this product a unique level transmitter. The principle of hydrostatic pressure measurement is that the pressure at a certain depth in a liquid medium is caused by the weight of the medium above that measurement point. It is proportional to the density of the medium and the local gravitational acceleration. The proportional relationship between them is reflected by the formula P=ρGH. Where P = pressure, ρ = density of the medium, G = acceleration due to gravity, and H = depth of the measurement point. Therefore, the physical quantity measured by an immersion level gauge is actually pressure, which can be understood through the calibration unit MH2O of the gauge. The actual liquid level must be determined through calculation, by knowing the two parameters of density and gravitational acceleration. Based on the principle that the measured hydrostatic pressure is proportional to the height of the liquid, advanced isolated diffused silicon sensing elements or ceramic capacitive pressure sensors are used to convert the hydrostatic pressure into electrical signals; after temperature compensation and linear correction, these signals are transformed into standard electrical signals (usually 4–20mA/1–5VDC). It is widely used in applications such as measuring the water levels upstream and downstream of hydroelectric plants, as well as well water levels. The static pressure of the liquid medium acts directly on the sensing diaphragm; this static pressure is proportional to the height of the liquid being measured. The static pressure generated by the liquid level causes the sensing diaphragm to move. Normal pressure induces displacement of the diaphragm, and the resulting change in capacitance is detected and amplified by the electronic components connected to it, which then convert this pressure into a 4-20mA signal for output. Jiangsu Huike Automation Instrument Co., Ltd. offers you professional advice on product selection as well as reliable products. If you have any questions, feel free to call us; we will assign professional technicians to assist you.