In fact, the liquid level sensor is a pressure sensor for measuring the liquid level. The static pressure input type liquid level transmitter is based on the principle that the measured hydrostatic pressure is proportional to the height of the liquid and adopts foreign advanced isolated diffusion silicon sensitive element or ceramic capacitance pressure sensitive sensor to convert static pressure into electric signal , After temperature compensation and linear correction, converted into standard electrical signals (usually 4 ~ 20mA/1 ~ 5VDC). So, what are the types of level sensors ?
Type of liquid level sensor Liquid level transmitter is mainly used in the production of industrial enterprises, sealed tanks, open tanks, cement tanks, iron tanks, plastic tanks, underground tanks and other measurements.
1. Float level transmitter:
It consists of a magnetic float, a measuring tube, a signal unit, an electronic unit, a junction box, and a mounting part.
Generally, the specific gravity of the magnetic float is less than 0.5, and it can float on the liquid surface and move up and down along the measuring tube. The catheter is equipped with a measuring element, which can convert the measured liquid level signal into a resistance signal proportional to the change of liquid level under the action of external magnetic flux, and converts the electronic unit into 4-20 mA or other standard signal output. The transmitter is a module circuit, which has the advantages of acid resistance, moisture resistance, shockproof, anti-corrosion, etc. The circuit contains a constant current feedback circuit and internal protection circuit, so that the maximum output current does not exceed 28mA, so it can reliably protect the power supply and make two The secondary meter is not damaged.
2. Float level transmitter:
The magnetic float was changed to a buoy, which was designed according to the Archimedes buoyancy principle.
Float type liquid level transmitters use tiny metal film strain sensing technology to measure liquid level, boundary level, or density. It can perform routine setting operations through on-site key presses while working.
The transmitter operates using the principle of hydrostatic pressure measurement. It generally selects the silicon pressure pressure sensor to convert the measured pressure into an electric signal, and then compensates by the amplifying circuit and the compensating circuit, and finally outputs the current by 4-20 mA or 0-10 mA.
3. Capacitive level transmitter:
It is suitable for industrial enterprises to measure and control the production process during the production process. It is mainly used as a continuous measurement and indication for remote distances of liquid level or powdered solid material level in conductive and non-conductive media.
The capacitive level transmitter consists of a capacitive sensor and an electronic module circuit. It uses a two-wire constant current output of 4 to 20mA as the base type. After conversion, it can be output in three-wire or four-wire mode. The output signal is formed as 1 to 1 5V, 0 ~ 5V, 0 ~ 10mA and other standard signals. The capacitive sensor consists of an insulated electrode and a cylindrical metal vessel equipped with a measuring medium. When the material level rises, the dielectric constant of the non-conductive material is significantly smaller than the dielectric constant of air, so the capacitance changes with the height of the material.
Transmitter module circuit consists of reference source, pulse width modulation, conversion, constant current amplification, feedback and current limiting unit. The advantage of using the pulse width modulation principle to measure is that it has a low frequency, interference with ambient radio frequency, good stability, good linearity, and no significant temperature drift.
4 magnetic flap level transmitter:
Applicable to the level measurement of iron tanks, plastic tanks and chemical reactors.
5. Ultrasonic level transmitter:
Suitable for medium viscosity measurement. The price is relatively low.
6. Radar level transmitter:
Suitable for medium viscosity measurement. The price is relatively high.
Xiao Bian concludes: The above introduced the type of liquid level sensor , hope to be helpful to everybody. For more relevant knowledge, please continue to pay attention to this website information platform. Follow-up will present more exciting content for everyone.
Type of liquid level sensor Liquid level transmitter is mainly used in the production of industrial enterprises, sealed tanks, open tanks, cement tanks, iron tanks, plastic tanks, underground tanks and other measurements.
1. Float level transmitter:
It consists of a magnetic float, a measuring tube, a signal unit, an electronic unit, a junction box, and a mounting part.
Generally, the specific gravity of the magnetic float is less than 0.5, and it can float on the liquid surface and move up and down along the measuring tube. The catheter is equipped with a measuring element, which can convert the measured liquid level signal into a resistance signal proportional to the change of liquid level under the action of external magnetic flux, and converts the electronic unit into 4-20 mA or other standard signal output. The transmitter is a module circuit, which has the advantages of acid resistance, moisture resistance, shockproof, anti-corrosion, etc. The circuit contains a constant current feedback circuit and internal protection circuit, so that the maximum output current does not exceed 28mA, so it can reliably protect the power supply and make two The secondary meter is not damaged.
2. Float level transmitter:
The magnetic float was changed to a buoy, which was designed according to the Archimedes buoyancy principle.
Float type liquid level transmitters use tiny metal film strain sensing technology to measure liquid level, boundary level, or density. It can perform routine setting operations through on-site key presses while working.
The transmitter operates using the principle of hydrostatic pressure measurement. It generally selects the silicon pressure pressure sensor to convert the measured pressure into an electric signal, and then compensates by the amplifying circuit and the compensating circuit, and finally outputs the current by 4-20 mA or 0-10 mA.
3. Capacitive level transmitter:
It is suitable for industrial enterprises to measure and control the production process during the production process. It is mainly used as a continuous measurement and indication for remote distances of liquid level or powdered solid material level in conductive and non-conductive media.
The capacitive level transmitter consists of a capacitive sensor and an electronic module circuit. It uses a two-wire constant current output of 4 to 20mA as the base type. After conversion, it can be output in three-wire or four-wire mode. The output signal is formed as 1 to 1 5V, 0 ~ 5V, 0 ~ 10mA and other standard signals. The capacitive sensor consists of an insulated electrode and a cylindrical metal vessel equipped with a measuring medium. When the material level rises, the dielectric constant of the non-conductive material is significantly smaller than the dielectric constant of air, so the capacitance changes with the height of the material.
Transmitter module circuit consists of reference source, pulse width modulation, conversion, constant current amplification, feedback and current limiting unit. The advantage of using the pulse width modulation principle to measure is that it has a low frequency, interference with ambient radio frequency, good stability, good linearity, and no significant temperature drift.
4 magnetic flap level transmitter:
Applicable to the level measurement of iron tanks, plastic tanks and chemical reactors.
5. Ultrasonic level transmitter:
Suitable for medium viscosity measurement. The price is relatively low.
6. Radar level transmitter:
Suitable for medium viscosity measurement. The price is relatively high.
Xiao Bian concludes: The above introduced the type of liquid level sensor , hope to be helpful to everybody. For more relevant knowledge, please continue to pay attention to this website information platform. Follow-up will present more exciting content for everyone.
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