Level Sensors : Everything You Need To Know


If your business stores industrial levels of liquid, “mush” or bulk solids such as aggregates, it’s vital that you are able to track the amounts in each vessel – so that you can order more when containers need to be refilled, or to ensure that they remain at precise levels if required.

One of the most accurate methods by which to do this is to invest in level sensors. In this article, we explore a little about the main types of level sensors and what they do.


What is a Level Sensor? 

A level sensor is a piece of technology designed to measure the amount of material being held in a certain container such as a water tank. Level sensors produce an alert signal or another form of notification when a vessel’s contents reach a certain level.


What are the Main Differences Between Level Sensors and Level Switches? 

A level switch serves a similar purpose to a level sensor, though switches are used specifically in situations where only high or low content level notifications are required, helping to prevent a container from being overfilled or running dry.

Level sensors, on the other hand, tend to be employed where the contents must be carefully monitored to ensure they remain at a constant level at all times.


What are the Different Types Of Level Sensors? 

There is a wide range of level sensor types. However, the main options are:

  • Ultrasonic level sensors
  • Capacitive level sensors
  • Hydrostatic level sensors
  • Through wall level sensors
  • Proximity level sensors


Level Sensor Uses

The level sensors available from GNW are capable of measuring and reporting levels in a wide range of different ways to suit various media and storage methods.


Ultrasonic Level Sensors

Ultrasonic sensors utilise sound pulses which reflect off the surface of the contained material to give a highly accurate level reading. 

One of the main attractions of the ultrasonic models is that they are non-contact fluid level sensors, which means they are ideal for use with materials that should not be agitated.

Guided wave radar sensors work in a similar way, using electromagnetic waves at a high frequency.


Capacitive Level Sensors

A capacitive level sensor is made up of two electrodes that produce an electrical current. Those sensors are then placed into the substance within a container. The level of the media inside a container can be determined by analysing variations in that current.

These sensors work with both liquids and solids, and are highly sensitive, making them perfect for use with low-density substances.


Hydrostatic Level Sensors

Another submersible tool, a hydrostatic sensor is employed when measuring liquid levels. This particular tool actually measures the pressure generated by the “head” or surface of the liquid in the container.


Through Wall Level Sensors

Generally used in the measurement of liquid levels in non-conductive vessels, a through-wall sensor is used to accurately detect amounts without being placed in the same container as the media itself. 

By way of a switch relay output, equipment of this kind gives readings by sensing levels through a vessel wall.


Proximity Level Sensor

This equipment creates an alert when material within a container comes within a predetermined range of the sensor. The media does not need to touch the sensor or reach the same level; and precise proximities may be specified by the operator.


Where Can I Find a Level Sensor to Buy With Fitting?

Whether you’re looking for a highly accurate oil tank level sensor, a sensor for use in the storage of catering ingredients or equipment to measure volatile or corrosive substances, you can find the perfect solution at GNW Instrumentation.

Our engineers will also fit, commission, and calibrate your new sensors – and can even check and maintain existing equipment.

For more information about the level sensors and switches available from GNW, feel free to get in touch with our knowledgeable team today.