Principle application of three liquid level sensors

1. Float type liquid level transmitter

The float type liquid level transmitter changes the magnetic float ball into a float, and the liquid level sensor is designed based on the Archimedes buoyancy principle. The float type liquid level transmitter uses tiny metal film strain sensing technology to measure the liquid level, interface or density. It can perform regular setting operations through on-site buttons during operation.

2. Float type liquid level transmitter

The float type liquid level transmitter consists of a magnetic float, a measuring tube, a signal unit, an electronic unit, a junction box and mounting parts. Generally, the specific gravity of the magnetic float is less than 0.5. It can float above the liquid surface and move up and down along the measuring tube. The tube is equipped with a measuring element, which can convert the measured liquid level signal into a resistance signal proportional to the liquid level change under the action of an external magnet, and convert the electronic unit into a 4-20mA or other standard signal output.

The liquid level sensor is a modular circuit with the advantages of acid resistance, moisture resistance, shock resistance, and corrosion resistance. The circuit contains a constant current feedback circuit and an internal protection circuit, which can make the maximum output current not exceed 28mA, thus reliably protecting the power supply and preventing the secondary instrument from being damaged.

3. Hydrostatic level transmitter

The transmitter works on the principle of measuring liquid static pressure. It generally uses a silicon pressure sensor to convert the measured pressure into an electrical signal, which is then amplified by an amplifier circuit and compensated by a compensation circuit, and finally output in the form of 4-20mA or 0-10mA current.