capactive level sensor

The capacitive liquid level gauge is suitable for continuous detection of various liquids under severe conditions such as high temperature and high pressure, strong corrosion, easy crystallization, and easy clogging. The capacitive liquid level gauge is suitable for measuring the water level of sewage, acid and alkali solution, and boiler. The whole machine does not have any movable or elastic parts, and is resistant to impact, convenient to install, high in reliability and high in precision. It can replace the traditional float, input, differential pressure and other liquid level transmitters in various applications.

The core component of the capacitive level gauge adopts advanced RF capacitance detection circuit to convert into a standard electrical signal (generally 4~20 mA) after 16-bit single-chip microcomputer through high temperature compensation and linear correction. Optional HART, CANBUS, 485 communication protocol for system configuration. The full range of capacitive level gauges are self-calibrating, allowing users to automatically calibrate “zero” and “range” with two buttons to suit different requirements in complex locations.

The product complies with GB3836.4-2000 "Electrical Equipment for Explosive Gas Environments Part 4 Intrinsically Safe Type "i"" and GB3638.1-2000 "General Requirements for Part 1 of Explosive Gas Environment Electrical Equipment", Explosion-proof Mark: ExiaIIC T6, It is suitable for use in Zone 0, Zone 1, Zone 2, and contains areas of IIA to IIC, T1 to T6 explosive gas mixtures.

Capacitive level gauge features:

1. Simple structure, without any movable or elastic components, so the reliability is extremely high and the maintenance is very small. Under normal circumstances, it is not necessary to carry out regular large, medium and small maintenance.

2, a variety of signal output, to facilitate different system configurations.

3. It is suitable for liquid level measurement of high temperature and high pressure vessels, and the measured value is not affected by the temperature and specific gravity of the liquid to be tested and the shape and pressure of the container.

4. It is especially suitable for the measurement of strong corrosive liquids such as acid and alkali.

5, perfect overcurrent, overvoltage, power polarity protection.

Capacitive level gauge performance:

1. Detection range: 0.01~2000m

2. Pressure range: -0.1MPa~32MPa

3, the probe temperature: -50~250 °C

4, the ambient temperature: -20 ~ 60 ° C

5, storage temperature: -55 ° C ~ +125 ° C

6, the output signal: 4 ~ 20mA, 4 ~ 20mA superimposed HART communication, 485 communication, CAN bus communication

7, the power supply voltage: 12 ~ 28VDC (need to be powered by the safety barrier)

8, fixed way: thread installation M20 × 1.5, M27 × 2,

Flange mounting DN25, DN40, DN50. Special specifications can be customized according to requirements

9, wet material: 316 stainless steel, 1Gr18Ni19Ti or PTFE

10. Long-term stability: ≤0.2%FS/year,

11, temperature drift: ≤ 0.02% FS / ° C (in the range of 0 ~ 70 ° C)

12, explosion-proof grade: intrinsically safe ExiaIIC T6 flameproof ExdIIC T5

13, protection level: IP67

14. Intrinsic safety parameters: Ui: 28VDC, Ii: 93mA, Pi: 0.65W, Ci: 0.042uf, Li: 0mH

Capacitive level gauge installation and commissioning:

       Cable-type capacitive level gauges and rod-type capacitive level gauges are available in a variety of mounting and mounting options to suit different site conditions. When the site can not provide M20 × 1.5 internal thread or flange and other process facilities, you can choose from three installation methods: wall-mounted, horizontal pipe rack and vertical pipe rack, which makes you feel comfortable in the field installation.

       When measuring the medium with high fluidity, in order to prevent the sensor from swinging violently, the user can choose the weight attachment to stabilize the sensor. When adding the weight, the weight should be placed in the bottom of the container to avoid the bad transmission. Sense wire.

       In the harsh environment, the user should use the sensor cover to protect the sensor from foreign objects or affect the accuracy of the measurement.

       Use capacitive level timer. If it is not a metal container, you need to connect the outer casing of the transmitter to the bottom of the container with one wire, otherwise the measurement is not accurate.


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