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Level Sensors

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About Level Sensors

Level sensors are used to detect liquid or powder levels, or interfaces between liquids. There are two basic level-measurement types: continuous and point or multi-point. Continuous level sensors measure liquid or dry material levels within a specified range and provide outputs which continuously indicate the level. Point level sensors or multi-point sensors mark a specific level and are used generally as a high alarm or switch. These level sensors can also be integrated in a single device to add a low alarm, or to serve as a stepped version of a continuous level. For both types of level sensors, choices for output options include analog voltage signal, analog current signal, frequency or modulated frequency, and alarm or visual indicator.   

There are three major device classifications for level sensors: sensor-only, sensor system, and transmitter. Sensor-only devices provide outputs for processors, controllers, or data acquisition systems; however, they do not have a display or user interface. Typically, sensor-only devices are used in applications that require a switch. Level sensor systems are simple instruments or gauges. These level sensors provide more capabilities than sensor-only (transducer) devices, and may include a display and/or user interface. Generally, level sensor systems are designed for applications that require a simple gauge, a locally-programmable (stand-alone) unit, or a controller/totalizer. Sensor transmitters are designed to transmit data from the sensor via a two-wire current loop. The loop has an external power supply, and the transmitter acts as a variable resistor with respect to its input signal. 

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Products & Services Related to Level Sensors

Dry Material (Powders) Level Sensors
Dry material (powders) level sensors are used to measure levels of solid, dry materials in either continuous or point values represented with various output options.
Dry Material (Powders) Level Switches
Dry material (powders) level switches are used to measure levels of dry, solid materials via an electrical switching action.
Level Switches
Level switches is a generic search form for devices that are used to detect liquid or powder levels, or interfaces between liquids. These level measurements are indicated via an electrical switching action.
Level Transmitters
Level transmitters or level transducers are used to measure the level of a liquid or bulk solid material (as well as slurries) within a specified space. For each measurement, they provide an electrical output that is proportional to the input level.
Liquid Level Sensors
Liquid level sensors are used to detect liquid levels or interfaces between liquids such as oil and water or liquids and solids. 
Liquid Level Switches
Liquid level switches are used to detect specific liquid levels or interfaces between liquids. These level measurements are indicated via an electrical switching action.

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Engineering Web: Level Sensors

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Point Level Switches RF point-level switches with no moving parts for liquids and bulk solids.
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Part Numbers for Level Sensors

Part # Distributor Manufacturer Product Category Description
9034LSDDDP3 PLC Radwell SQUARE D Not Provided LEVEL SENSOR 55VDC LSD
RF92C4G1A PLC Radwell BINDICATOR Not Provided LEVEL SENSOR
SM552A173 PLC Radwell HYDE PARK Not Provided ULTRASONIC SENSOR DUAL-LEVEL SENSORS
SM952A400000 PLC Radwell HYDE PARK Not Provided PROXIMITY SENSOR 30MM 1/2 DUAL LEVEL
LLE101101 Digi-Key Honeywell Sensing and Control Sensors, Transducers SENSOR LIQUID LEV TYPE1 -40-125C

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