Point Level Measurement

Level detectors detect media at a predefined position depending on the installation position.

Level detectors are mainly installed as full or empty detectors in the upper or lower part of a silo or container. This prevents the silo from overfilling or running empty. In combination with a level sensor, this results in a redundant system which additionally increases plant safety. If a certain fill level is of particular interest, the sensors can also be used as demand detectors.

There are different technologies for level detection, which have their advantages and disadvantages depending on the application. For the selection, numerous process conditions have to be considered, which the sensor technology has to cope with. In addition, the requirements for bulk solids sensors differ from those for liquid sensors. For this reason, UWT offers a broad portfolio of different technologies such as rotary paddle switches, vibration level switches and capacitive sensors. This allows us to individually address their requirements in order to always provide them with the best possible solution.

Typical challenges:

• Media type (e.g. bulk, powder, liquid, paste, etc.)
• Media properties (e.g. bulk density, conductivity, viscosity, etc.)
• Input conditions (e.g. tank material, tank geometry, installation position, installations within the tank, etc.)
• Process conditions (e.g. pressure, temperature, ambient conditions, explosion protection, hygiene requirements, etc.)

In addition to our point level detection sensors our product portfolio also includes a variety of continuous level measurement sensors which unlike limit level sensors can detect the exact level of a medium in real time. 

FAQs

How does point level measurement work at high temperatures?

Rotary paddle detectors can be used as point level detectors up to a process temperature of 1100 °C. Special materials and bearings must be used. The correct installation position must also be observed.

Which point level switch is suitable for interface measurement (solids in water)??

A tuning fork probe with electronics specially developed for interface measurement is used. The adjustable sensitivity allows the probe to be set to the desired switching point.

Which point level detector is suitable for pressurised hoppers?

A tuning fork is very suitable for bulk materials, e.g. cement and quartz. A process pressure of up to 16 bar is possible with many devices. A rotating paddle detector is also possible up to a process pressure of 10 bar.

Which limit switches are adjustable in the boom length?

Rotary paddle switches, tuning forks, vibrating rods and capacitive limit switches can be adjusted when using a height adjustment sleeve.