Types of liquid level sensors introduction of six

2022-07-22
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In recent years, the domestic magnetic flap liquid level sensor market has been growing at a rate of more than 10%. In 2010, the sales of liquid level sensors in China reached 90.5 billion yuan. So what is the liquid level sensor

in fact, the liquid level sensor is a pressure sensor for measuring liquid level. The static pressure input liquid level transmitter is based on the principle that the measured static pressure of the liquid is proportional to the height of the liquid. It adopts foreign advanced isolated diffused silicon sensor or ceramic capacitor pressure sensor to convert the static pressure into an electrical signal, which is then converted into a standard electrical signal (generally 4 ~ 20mA/1 ~ 5VDC) through temperature compensation and linear correction. Then, what are the types of liquid level sensors

type of liquid level sensor

liquid level transmitter is mainly used for the measurement of sealed tanks, open tanks, cement tanks, iron tanks, plastic tanks, underground tanks, etc. in the production of industrial enterprises

1. Floating ball liquid level transmitter:

consists of magnetic floating ball, measuring conduit, signal unit, electronic unit, junction box and mounting parts

generally, the specific gravity of the magnetic floating ball is less than 0.5, which can float above the liquid level and move up and down along the measuring tube. A measuring element is installed in the catheter, 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 field, and convert the electronic unit into 4 ~ 20mA or other standard signal output. The transmitter is a modular circuit, which has the advantages of acid resistance, moisture resistance, shock resistance, corrosion resistance, etc. the circuit contains a constant current feedback circuit and an internal protection circuit, which can make the maximum output current not more than 28ma, so it can reliably protect the power supply and the secondary instrument from damage

2. Pontoon type liquid level transmitter:

is to change the magnetic floating ball into a pontoon, which is designed according to Archimedes' buoyancy principle

pontoon liquid level transmitter uses tiny metal film strain sensing technology to measure liquid level, boundary or density. When it works, it can use the on-site keys to carry out the routine setting operation

the transmitter works based on the measurement principle of hydrostatic pressure. Generally, silicon pressure sensor is used to convert the measured pressure into electrical signal, which is amplified by amplification circuit and compensated by compensation circuit, and finally output in the form of 4 ~ 20mA or 0 ~ 10mA current

3. Capacitive liquid level transmitter:

it is suitable for industrial enterprises to measure and control the production process in the production process. It is mainly used for long-distance continuous measurement and indication of liquid level of conductive and non-conductive media or powder particle solid level

capacitive liquid level transmitter is composed of capacitive sensor and electronic module circuit. It is based on two-wire 4 ~ 20mA constant current output. After conversion, it can be output in three wire or four wire mode, and the output signal is formed into standard signals such as 1 ~ 5V, 0 ~ 5V, 0 ~ 10mA. The capacitance sensor is composed of an insulated electrode and a cylindrical metal container containing a measuring medium. When the material level rises, the dielectric constant of the non-conductive material is significantly smaller than that of the air, so the capacitance changes with the height of the material

the module circuit of the transmitter is composed of reference source, pulse width modulation, conversion, constant current amplification, feedback and current limiting units. The advantages of using pulse width modulation principle for measurement are low frequency, good stability, good linearity, no obvious temperature drift, etc

4. Magnetic flap liquid level transmitter:

it is suitable for liquid level measurement on iron cans, plastic cans and reaction kettles in chemical industry

5. Ultrasonic liquid level transmitter:

suitable for measuring medium with high viscosity. The price is relatively low

6. Radar liquid level transmitter:

it is applicable to the measurement of medium with high viscosity. The price is relatively high

conclusion: the above introduces the types of liquid level sensors, hoping to help you. For more relevant knowledge, please continue to pay attention to the information platform. More wonderful content will be presented for you in the follow-up

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