The Gems liquid level sensor is used to detect liquid levels or interfaces between liquids such as oil and water or liquids and solids. They can be defined as sensors or transducers, or as integrated systems with instrumentation and control capabilities.

Types of Sensors
Liquid level sensors provide measurement of the height or position of a fluid surface using a variety of different technologies and methods.
* Air bubbler systems involve a fixed flow of air passed through a tube with an opening below the surface level of the measured liquid. Pressure is proportional to the depth and density of the liquid.
* Capacitance sensors apply radio frequency signals to a capacitance circuit to sense materials with dielectric constants ranging from 1.1 to 88 or more.

Other Sensors
The Gems liquid level sensor provides superior quality. Additional sensors include:
* Conductivity or resistance sensors use a low-voltage power source applied across separate electrodes. Level is interpreted based on the amount of resistance or conductance of the substance which carries the current.
* Float sensors involve the opening or closing of a mechanical switch through either direct contact or magnetic operation from a device which floats on the surface of the measured liquid.

Continuous or Point Sensing
Level sensors can operate either continuously or by point sensing. Point sensing involves taking measurements at certain instances. Point liquid level sensors often trigger an alarm or turn off the system based upon a specific limit. Continuous sensors provide a constant measuring and indication of the level of the liquid.

Direct or Indirect
Liquid level sensors measure position and level either by direct or indirect methods. Direct measurement includes methods that directly sense position and level. Indirect measurement involves the sensing of other factors such as pressure head, which can then be translated to height or level. Indirect methods are not suitable when other parameters involved, such as liquid density, are variable.

Contact or Non-Contact
Gems Liquid level sensors measure using either contact or non-contact methods. Contact methods involve physical contact between the device and the liquid, while non-contact methods measure without touching the media. Non-contact methods are the best choice for servicing corrosive media.

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