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Measuring techniques for point level detection

In point level detection, a point level switch detects when a certain predefined level is reached. Such a device is employed when it is not necessary to measure every possible intermediate level, as is the case with continuous level measurement. A switching command starts or stops filling equipment such as conveyors or pumps. Point level switches outputting a binary signal can be integrated into a process control system. 
Point level detection systems can be used in liquids, pastes, powders or coarse bulk solids.
Typical applications for level switches are:
  • minimum or maximum detection
  • leak detection
  • overfill protection

in process tanks, storage tanks, silos and pipelines.


Step by step to the right sensor

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Measuring principles
Function
Applications

Measuring techniques for point level detection

Vibration

VEGASWING, VEGAVIB, VEGAWAVE: Point level measurement with vibrating level switches

Capacitive

VEGACAP: Point level detection with capacitive level switches

Conductive

VEGAKON, EL: Point level detection with conductive point level switches

Radar

VEGAMIP: Point level detection with microwave barrier

Radiation-based

PROTRAC: Radiometric point level detection

Level switch for point level detection

In a nutshell: Point level detection

In point level detection, level switches transmit a signal when a predefined level in a tank, silo or container is reached. A switching command then starts or stops filling equipment such as conveyor belts or pumps. When their output is converted into a binary signal, level switches can be integrated into a process control system. 
What methods are used for point level detection?

The following measuring principles can be used for point level detection:

Which measuring principle is the right one depends on where the level switch is to be used. We’re happy to assist you in finding the most suitable level switch for your application.

What are the advantages of VEGA level switches?

Fast delivery

Even though all level switches are individually manufactured to customer specifications, VEGA sensors are delivered within a few days. 

Simple mounting

Point level sensors are particularly flexible during installation, as they can be mounted in almost any position. 

Long service life

Their robust mechanical design is the basis for reliable, trouble-free and maintenance-free operation and a long service life.

Where can level switches be used?

VEGACAP: Limit level measurement with capacitive level switches
  • Typical areas of application for point level detection in the process industry are:
  • Process vessels
  • Storage tanks
  • Silos
  • Pipelines
  • Overflow basins

There, the level switches serve as:

  • Full detector, i.e. overfill protection: the switching command stops the filling process
  • Empty detector:  the switching command starts the filling process
  • Dry run protection for pumps
  • Leakage monitoring
  • Oil/water detection
  • Foam detection
  • Interface detection

The measured media are usually:

  • Liquids
  • Pasty media
  • Light bulk solids such as cement, flour, etc.
  • Heavy bulk solids such as gravel, scree, etc.
  • Foam

What requirements must level switches meet?

The primary goal in the manufacturing and processing of products is consistent product quality. In order to achieve this, rigorous demands, which vary from industry to industry, are also placed on the measurement technology used. VEGA has the right level switch  for every application.

Depending on the measuring principle and sensor configuration, point level sensors from VEGA can also be used in the following areas:

  • Hazardous zones and safety-related systems up to SIL2
  • Chemically aggressive media
  • Abrasive or adhesive media
  • Special hygienic applications in the food and pharmaceutical industries thanks to certified materials and process fittings
  • Extreme temperature and pressure conditions