Capacitive Sensors for Point Level Detection

Product Description

Capacitive sensors detect liquids through non-metal tank walls. They are used to detect the liquid level, leakage, or overflow of tanks. Typical applications are found in the medical device, pharmaceutical, food, chemical and semiconductor industries. The Non-Contact LL Point sensor, SMD 9644, is a noninvasive water level sensor designed to provide external liquid level measurement for non-metal containers and non-metal pipe/tube. With our patented technology, the non-contact liquid level sensor can detect container level by simply attaching the sensor onto external surface of containers. That means it won’t contact liquid and you don’t need to open closed container. Thus, it doesn’t pollute the liquid. The non-metal material can be plastic, glass, or ceramics. In capacitive point level detection, the sensor and vessel form the two electrodes of a capacitor. Any capacitance change caused by a level change is converted into a switching signal. This sensor can be perfectly adapted to any application. They are often used for overfill or dry run protection as well as oil/water or foam detection.

The Advantages

• The level switch can be installed with adhesive on the outside of the container anywhere along its vertical sides.
• Multiple sensors can be installed on each container providing Empty, Full, Near Empty, NearFull, or more levels as needed.
• Low-cost point level detection for maintenance-free operation
• Non-invasive point level detection

With low cost and good performance, this noninvasive water level sensor switch is ideal for applications such as water tower, water tank, environment protection device, medical device, whirlpool tub, coffee machine maker, water dispenser, etc.

Application in the Medical arena

Avoiding direct contact with the target material reduces the chances of product contamination, leaks, and other sources of risk to personnel and the environment. The target material also has certain relevance in the sensor selection process. Medical applications involve mostly water-based reagents, processed fluids, and various bodily fluids. Fortunately, high conductivity levels and therefore high relative dielectric constants are common characteristics among all these liquids. This is why the primary advantages of capacitive sensors lies in non-invasive liquid level detection, namely by creating a large measurement delta between the low dielectric container walls and target material with high dielectric properties.
Speak to a sales engineer about your application 203-294-5800

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