Level Measurement Measuring the level of a medium in a tank is a fundamental requirement in many industrial processes/ automation. For liquid applications, accurate level measurement is essential for safe and efficient operation. and level measurement commonly used for process control and safety interlocks Continuous Level Measurement Several technologies are used to continuously monitor liquid levels: Reed Chain Technology: Uses a magnet-equipped float to activate reed switches along a chain. Magneto strictive Level Measurement: Very accurate method using a float and probe to detect position changes. Hydrostatic Level Measurement: Determines level based on liquid pressure at the tank bottom. These methods typically use floats, level probes, or level sensors. Point Level (Limit Level) Detection For detecting high or low levels, level limit switches are used. A proven approach includes: Capacitive Level Measurement: Measures chang...

What is a paddle type level switch? Basically the paddle type level switch is a very simple concept and works on the movement of the paddle. A paddle is installed underneath the sensor setup, which is driven by a small electric motor. In the absence of any media, the paddle will move freely. If exposed to any medium, more force will be needed to move the paddle. It may also happen that the paddles stop rotating. This rotational change alters the electrical output.

What is an optical level switch? Optical level switches are basically similar to radar sensors; The difference is that instead of waves, optical light is emitted. Light is transmitted and returned in a cone-shaped prism structure. This means that the light will not travel all the way to the medium, but will be confined within a structure. When there is no medium in this structure, the light will reflect back. If there is a medium present then the light will not be reflected back. This causes the electrical output to change.

What is a Radar and Laser Level Switch? Radar and laser level switches are basically non-contact switches that emit ultraviolet radar rays and microwaves to transmit and reflect waves. The waves strike the surface of the media and reflect back to the transmitter. It then measures the distance or height of the medium by measuring the time taken to transmit and receive and the speed of the wave. Velocity will be constant, but time will vary. This causes the electrical output to change.

What is a vibrating fork level switch? Basically the vibrating fork-level switch works on the principle of vibration. It uses a fork that is vibrated each time by an internal mechanism. When this fork comes in contact with media, the vibration level changes. This causes the electrical output to change.

What is an inductive level switch? Basically an inductive level switch works on the principle of electromagnetic radiation and eddy currents. This oscillator uses a resonant circuit that uses a core magnetic coil to generate a strong electromagnetic field. When this field penetrates the media, it creates eddy currents that reduce the amplitude of the oscillations. This changes the electrical output.

What is Displacer Level Switch? Basically the displacer level switch works on the principle of shifting weight. A displacer is used, which is a kind of very heavy float, which is suspended by a spring. When the media level touches the displacer and submerges it in the water, due to the buoyant force, the weight of the displacer decreases compared to the acting medium. This releases spring pressure and changes electrical output. This means that the weight of the displacer must be greater than the weight of the media in normal conditions (when the media is not touching). Only then, it will detect the weight change.

What is a conductivity level switch? Essentially, a conductance level switch works the same as a capacitance level switch; The only difference is that it works on resistance. Similar to the probe theory mentioned earlier, the difference in resistance between them (based on the media layer) changes the electrical output. It will only work if the media has some conductivity, which causes electrical resistance.

What is capacitive level switch? Basically capacitive level switch works on capacitance. Like a capacitor, a switch has an insulated electrode that acts as the first plate, and the tank wall (reference electrode) acts as the second plate. The capacity between the two varies depending on the height of the media level. As the level changes, the capacitance changes and so does the electrical output.

What is a diaphragm level switch? Basically a diaphragm level switch has a diaphragm inside the module that moves up and down depending on the applied media pressure. If the level rises, the diaphragm will move upward through the medium and lower the pressure below the face, changing the electrical output. If the level is falling, the diaphragm will move downward through the medium and change the electrical output, increasing the pressure below the face. This shows that pressure is the actuating force for this switch.

What is a float level switch? Basically float level switch is the most widely used level switch. A float level switch is either mounted or floating on the media. Suppose it floats on a liquid. When the float is in upright position or above upright position, it means the level is correct. Now, let's say the float went below the upright position. This means the level has dropped and due to this, the switch will change its electrical output. The switch has a magnet with a reed switch. It is the switch which gives the electrical signal. The switch is moved by a magnet which changes its position as per the floating level sensed.

  What is an optical level switch? Optical level switch Optical level switches are basically the same as radar sensors; The difference is that optical light is emitted instead of waves. And the light is transmitted and reflected back into the conical prism structure. This means that light will not travel all the way through the medium, but will be confined within a structure. And there is no medium in this structure, then the light will be reflected back. If a medium is present, the light will not be reflected back. This changes the electrical output.

What is a paddle type level switch? Paddle type level switch Basically it's a very simple concept and works on the movement of a paddle. And below is installed in the sensor setup, which is driven by a small electric motor. In the absence of any medium, the paddle will rotate freely. If in contact with any medium, more force will be required to move the paddle. It may also happen that the pedal stops rotating. This rotational change changes the electrical output.

What is an inductive level switch? Inductive level switch Basically an inductive level switch works on the principle of electromagnetic radiation and eddy currents. And it uses an oscillator resonant circuit that uses a core magnetic coil to generate a strong electromagnetic field. When this field penetrates the media, it creates eddy currents that reduce the amplitude of the oscillations. This switch changes the electrical output.

What is a vibrating fork level switch? Vibrating fork level switch Basically the vibrating fork level switch works on the principle of vibration. And it uses a fork that vibrates every time through an internal mechanism. When this fork comes in contact with the media, the vibration level changes. This changes the electrical output.

What is a Radar and Laser Level Switch? Laser level switch Basically radar and laser level switches are non-contact switches that emit ultraviolet radar rays as well as microwaves to transmit and reflect waves. And the waves touch the surface of the media and are reflected back to the transmitter. It then measures the distance or height of the medium by measuring the time it takes to transmit and receive and the speed of the waves.

What is capacitive level switch? Capacitive level switch Basically this switch is like a capacitor, the switch has an insulated electrode that acts as the first plate and the tank wall (reference electrode) acts as the second plate. And the capacity between the two varies with the height of the medium level. As the level changes, the capacitance changes and so does the electrical output.

What is a conductivity level switch? Conductivity level switch Basically the conductance level switch work is similar to the capacitance level switch; And the only difference is that it works on resistance. And this is similar to the probe theory mentioned earlier, the difference in resistance between them (based on the media layer) converts to electrical output. It will only work if the media has some conductivity, which causes electrical resistance.

What is Displacer Level Switch? Displacer level switch Basically the displacer level switch works on the principle of weight displacement. And a displacer is used, which is a very heavy float type, suspended by a spring. When the media level touches the displacer and submerges it in water, due to the buoyant force and the weight of the displacer relative to the acting medium. This releases the spring pressure and changes the electrical output. This means that the weight of the displacer must be greater than the weight of the media in normal condition (when the media is not touched). Only then, it will detect the change in weight.

What is a float level switch? Float level switch Basically float switch is the most common type of level switch. It is mounted or floating on the media to be sensed. Suppose it is floating on a liquid. When the float is in the upright position or above the upright position, it means the level is correct. Now, let's say the float goes below the vertical position. This means the level has dropped and because of this, the switch will change its electrical output. The switch consists of a magnet with a reed switch. It is the switch that transmits the electrical signal. The switch is moved by a magnet which changes its position according to the floating level sensed.