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Level Sensors

TABLE OF CONTENTS:

1. Level Sensors

2. Classification

3. Resistive, Capacitive

4. Pressure, Hall Effect, Ultrasonic

5. Radar Level, Optical

6. Selection of Sensors

Written By: 

 Preeti Jain

CLASSIFICATION-BASED ON SENSING POINTS

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Depending upon the number of location where presence of a fluid (or fluidic solids) is to be sensed, level

sensors can be broadly classified under three categories:

1.      Single Point Level Sensors -These sensors are used where fluid level is to be sensed only at

single location.

 

 

2.      Multi-point Level Sensors - These sensors are used where fluid level is to be sensed at number of

locations single location.

 

 

3.      Continuous Level Sensors - These sensors are used where fluid level at all locations is to sensed

 

 

CLASSFICATION-BASED ON SENSING PRINCIPLES

A wide variety of sensing principles are used are used for measurement of liquids, fluidic solids, slurries,

etc. These are explained below

 

·         Float Level Sensors

In these level sensors, a float moves with the liquid surface. The float is connected to a core via a spring.

A magnetic reed switch is mounted in the hermetically sealed core and the core moves inside a stem with

the float movement. The stem is encircles by powerful magnets. As the float rises or lowers with liquid

level, the reed switch gets operated due to the magnetic field generated by the magnets.

 

 

 

These sensors are also designed by keeping the stem and the core (with magnetic reed switch) stationary

and making magnets part of the movable float. For multipoint level sensors multiple magnets/ multiple

reed switches (depending upon the design) are used.

 

The principle of sensors (floats moving with the liquid level) can be coupled to dial gauges. Using

buoyancy, they can form Visual liquid level indicators.

 

 

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