The intelligent non-contact liquid level sensor (hereinafter referred to as the liquid level sensor) adopts advanced signal processing technology and high-tech integrated chip, which breaks through the influence of the container wall thickness and realizes the true non-contact of the liquid level in the closed container. Contact detection. The liquid level sensor (probe) is installed on the upper and lower sides of the outer wall of the container to be tested (the high and low levels of the liquid level). The non-metallic container does not need to be opened, and the installation is simple and does not affect production. It can detect the level of various toxic substances, strong acids, strong bases and various liquids in high-pressure airtight containers. The liquid level sensor has no special requirements for the material of the liquid medium and container, and can be widely used.
Product Features
The non-contact liquid level sensor is suitable for the outer wall of non-metallic containers without direct contact with the liquid. It will not be corroded by strong acids and alkalis and other corrosive liquids, and will not be affected by scale or other debris. The detection is accurate and stable, and the boiling water level can be detected. Pure electronic circuit structure, non-mechanical working mode, stable performance and durability. High stability, high sensitivity, strong anti-interference ability, free from external electromagnetic interference, special treatment for power frequency interference and common mode interference, to be compatible with 5V power adapters on the market. Strong compatibility, penetrates various non-metallic containers, such as plastic, glass, ceramic and other containers, the sensing distance can reach 5mm; liquid, powder, and particulate matter can be detected. High and low level output mode, suitable for connecting various circuits and product applications.
Working principle
The intelligent non-contact liquid level sensor uses the sensing capacitance of water to detect the presence of liquid. When there is no liquid close to the sensor, the sensor has a certain static capacitance to the ground due to the distributed capacitance on the sensor. When the liquid level slowly rises and approaches the sensor, the parasitic capacitance of the liquid will be coupled to this static capacitance, making the final capacitance value of the sensor larger, and the changed capacitance signal is then input to the control IC for signal conversion, which will change The capacitance is converted into a change of a certain electrical signal, and then a certain algorithm is used to detect and judge the degree of this change. When the change exceeds a certain threshold, it is considered that the liquid level has reached the sensing point.
Input voltage (Vin) | DC 5V |
Ripple and noise voltage | <100mVp-p |
electric current | 5mA±2mA |
Output voltage (high level) | 5V |
Output voltage (low level) | <0.4V |
Output current | ≤100mA |
Response time | 500mS |
Working temperature | -20~85C |
Induction thickness range | ≤15mm |
Liquid level accuracy | ±3mm |
Humidity | ≤100% |
Material | PC-V0 Fireproof material |
Waterproof performance | IP65 |
Requirements for the clearance between the contact surface of the sensor (or probe) and the outer wall of the container The contact surface of the sensor (or probe) and the outer wall of the container should be tightly pasted with AB or other solid-resistant glue. If there are special requirements, the gap should be less than 0.5mm, preferably no gap, otherwise it may affect the measurement accuracy
The adhesive material can be glass glue, 704 silicone, waterproof 3M double-sided tape, etc.
Precautions:
1. Do not use double-sided tape made of foam cotton.
2. The material of the container must be insulating material.
3. Try to use materials that are uniform and do not contain air interlayers, have no bubbles, do not absorb water, and do not easily change the dielectric constant as the container.