Types of Level Sensors: 

Types of level sensors for liquid level sensing include:

  • Single Point Level Switches
    • Detect a single liquid level in a tank or vessel

  • Multi Point Level Switches
    • Detect multiple liquid levels within a tank or vessel

  • Continuous Level Transmitters
    • Measure fluid level range within a tank or vessel continuously

  • Visual Level Indicators and Tank Level Gauges
    • Provide visible indication of the fluid level within a tank or vessel


Gems liquid level sensors and switches provide high-reliability monitoring and detection of a wide range of fluid media. Requirements can range anywhere from the sensing of cooking oil, to hydraulic fluids, to diesel fuel tanks, to water and wastewater, to biohazards, to even deionized or potable water.

To effectively address such a wide variety of measurement challenges, Gems offers a broad range of contact, non-contact, and non-intrusive liquid level sensors and switches. These are available in multiple technology types, including reed switch-based floats, solid-state electro-optical, conductivity, capacitive, ultrasonic, and piezo-resonant. Multiple liquid level sensing technologies may also be incorporated within a single application. Sometimes, more than one “best fit” solution may also exist, with the ultimate decision simply a matter of customer preference.

Standard catalog products for liquid level sensing include single point level switches, continuous level transmitters, multi-point level switches, and visual level indicators. Detailed specifications on these and other liquid level sensors and switches may be found in the links below.

Please consult our fully digital online standard product catalog for an up-to-date listing of available models for immediate customer shipment. Most Gems standard catalog products can be easily modified with alternate connectors and housings. Or, a custom solution can also be developed, many times delivered in OEM volumes with shorter lead times than most industry off-the-shelf solutions.