Capacitive Level Sensor
1. Feature
- Modbus protocol is easy to integrate.
- Simple structure without any movable or elastic components, so it has high reliability and minimal
Under normal circumstances, it is not necessary to carry out routine large, medium and small maintenance. - A variety of signal outputs are convenient for different system configurations.
- Suitable for level measurement of high temperature and high-pressure containers, and the measured
value is not affected by the temperature, specific gravity of the liquid to be measured, and the shape and pressure of the container. - It is especially suitable for the measurement of strong corrosive liquids such as acid and alkali.
- Perfect overcurrent, overvoltage and power supply polarity protection.
- Wireless level sensor has wireless remote transmission function.
- Can measure any medium.
2.Specification
- Detection range: 0.1～3m
- Capacitance measurement range: 10PF～500PF
- Accuracy: 0.1 class, 0.2 class, 0.5 class, 1 class
- Pressure range: -0.1MPa～32MPa
- Probe temperature resistance: -50～250℃
- Ambient temperature: -40～85℃
- Storage temperature: -55℃ ～+125℃
- Output signal: 4～20mA, 485 communication, etc.
- The communication distance of wireless output level sensor is less than 200 meters, and the power
supply voltage is 3.3-36V (optional battery power supply) - Power supply voltage: 5～36V DC
- Level sensor material: 316 stainless steel, 1Gr18Ni19Ti or PTFE
- Long-term stability: ≤0.1%FS/year,
- Temperature drift: ≤0.01%FS/ ℃ (within the range of 0～70 ℃)
- Explosion-proof grade: ExibIICT6
- Protection level: IP67.
3. Structure
- Capacitive liquid level sensors have different structures due to different application occasions and
parameters, but in general, its main structure can be roughly divided into two parts, namely the sensor part and the transmitter part. as the picture shows:
A in the picture shows the sensor, which directly probes into the container equipment or measures
in the measured medium of the meter tube - B and C in the figure are the gas phase and liquid phase connection flanges of the liquid level measurement and control instrument, which are used for the connection of the equipment flanges, and the liquid and pressure in the equipment are drawn to the measuring cylinder.
- D in the figure shows the measuring cylinder of the liquid level measurement and control instrument, which can form a capacitance with the sensor electrode.
- E shown in the figure is the sewage flange, which can regularly discharge the dirt in the liquid level
measurement and control instrument to the outside, keep the inside of the measuring tube of the liquid level measurement and control instrument clean, and prevent the sensor from adhering to the dirt. - F shown in the figure is the transmitter, which is a conversion device from capacitance to standard
current signal, and is the central part of the entire liquid level measurement and control instrument. Its main function is to receive the capacitance change increment caused by the liquid level change sent by the sensor, and then After conversion, it outputs 4-20mADC standard current signal. This transmitter adopts military integrated devices, with low power consumption, high temperature resistance, strong reliability, and meets the requirements of intrinsic safety.
Note: There is a sealing part between the transmitter and the measuring tube, which is composed of several seals, which can ensure that the measured medium is in contact with the sensor but will not leak out, causing harm. This section is an important sealing part, please do not disassemble it without the consent of the manufacturer to avoid accidents.
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