Simply The Best Tank Level Sensor: Submersible Level Sensor
Submersible level sensors estimate the level of a liquid by sensing its hydrostatic pressure. Hydrostatic pressure is the pressure exerted at a given position by a liquid due to the liquid’s weight above that point. This pressure difference is related to the height of the liquid in the tank.
The submersible level sensor is composed of a pressure transducer that transforms hydrostatic pressure into an electrical signal and an electronic circuit that amplifies and interprets the signal. Typically, the sensor is linked to the control unit through a cable. The submersible level sensor is submerged in the liquid, and the cable is hermetically sealed to prevent liquid entry.
Utilizing a piezoresistive or capacitance-based sensing diaphragm, the submersible level sensor measures the hydrostatic pressure. The electrical resistance of a piezoresistive submersible level sensor varies in response to variations in pressure. In reaction to changes in pressure, a capacitance-based submersible level sensor modifies the capacitance between its electrodes. These variations in resistance or capacitance are then translated into an electrical signal that may be analyzed and converted into a 4-20mA output signal.
The 4-20mA signal output is a standard industrial signal typically used for long-distance data transmission. The signal is a current loop that is proportional to the level being measured. The smallest level is represented by 4mA, while the maximum level is represented by 20mA. The control unit turns the signal into a digital readout that can be displayed on a panel or supplied to a control system.
In conclusion, submersible level sensors assess the level of a liquid by measuring its hydrostatic pressure. They include a pressure transducer, an electronic circuit, and a cable for connecting to the control unit. The submersible level sensor monitors hydrostatic pressure with a piezoresistive or capacitance-based sensing diaphragm and emits a 4-20mA signal proportionate to the liquid level.
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