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Capacitive Level Switches

Capacitive level switches are a type of sensor used to detect the presence or absence of material at a specific point within a container, tank, or silo. These switches operate based on the principle of capacitance, which is the ability of a system to store an electrical charge. The basic components of a capacitive level switch include two conductive plates separated by a non-conductive material, or dielectric. When the switch is near a material, such as a liquid or solid, the material acts as part of the dielectric, which changes the capacitance between the plates. This change in capacitance can be detected and used to infer the level of the material.

Capacitive level switches are known for their versatility and can be used with a wide range of materials, including liquids, solids, and slurries. They are particularly useful in applications where direct contact with the material is not desirable or possible. For example, they can be used with corrosive chemicals, at extreme temperatures, or under high pressure conditions without being damaged or degraded.


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Dwyer CLS2-W11RK1-019 is a weatherproof capacitive level switch suitable for liquids, powder, and bulk materials. It has a temperature range of -40 to 250°F and a power requirement of 12 to 240 VAC/DC. With a response time of 0.2s and an enclosure rating of NEMA 4X, it offers reliable performance. The switch type is DPDT (two form C) and it has an electrical rating of 8A @ 120/240 VAC res., 30 VDC. Its sensitivity can be adjusted with 8 selectable settings, and it features spark/static protection with a 10 MEG Ohm dissipation resistance.
Dwyer CLS2-W11RK1-006 Capacitive Level Switch is a weatherproof device suitable for liquids, powder, and bulk materials. It operates at temperatures ranging from -40 to 250°F, and power can be supplied from 12 to 240 VAC/DC. With a response time of 0.2 s and a pressure limit of 365 psi, it features a DPDT switch type and 8 selectable sensitivity settings. The switch can be adjusted to trip when the product touches the probe, with adjustable time delay and spark/static protection.