Introduction

Level sensor caters to variety of manufacturing processes to fulfill demand of quality assurance, accuracy and production improvement by identifying the level of application media like solid or liquid. This article specifically covers the variety of level instruments used for different types of solids and the parameters that would be remember while choosing the right level sensor for process material of solid.

Selection of Process Media

Different types of level instruments are available for level detection but before selecting the sensors, the exact type of application media should be known for betterment of output and process.

  • Bulky Solids
  • Granular Solids
  • Powder Form

Bulky Solids - The process media which includes heavy weight materials like limestone, coal etc. are known as bulky solids. These types of application material required level instruments with rigid support to resist the higher weight.

Examples of Bulky Solids
Coal - Bulky Solids

Coal

Limestone - Bulky Solids

Limestone

Crushed Stones - Bulky Solids

Stones

Factors to be considered
  • High Temperature - The bulky material like limestone, coal etc. are used in manufacturing processes where the temperature rises above the normal level so it is better to choose the level measuring devices which withstand in this conditions.
Products Recommended for Bulky Solids
Admittance based Level Sensor

SLA Dot Display

RF Admittance Level Sensor

Suitable for longer distances between probe and evaluation unit.

Admittance based Level Sensor

SLA Bar Display

RF Admittance Level Sensor

Suitable for materials that are prone to absorbing materials.

Admittance based Level Sensor

SLA Series

RF Admittance Level Sensor

Compact coat-immune admittance level switch for sticky solids, pastes and slurries.

Vibrating Rod Level Sensor

Vibrosonde

Vibrating Rod Level Sensor

Compact level limit switch for free-flowing as well as for bulky solids.

Granular Solids - The collection of free flowing particles like grains, sugar etc. are known as granular material. The size of granular material vary with the application media. The grain size plays important role while choosing the vibrating forks level sensors.

Examples of Granular Solids
Wooden Chips - Granular Solids

Wooden Chips

Sugar - Granular Solids

Sugar

Coffee - Granular Solids

Coffee

Factors to be considered
  • Grain Size - The most important factor that should be considered while selecting the level instruments for granular material. For choosing the vibrating forks series the maximum grain size should be 12 mm not more than that.
  • Moisture Content - 7-10% of moisture content should be considered for recommanding the level instruments in granular materials for providing better accuracy and output.
Products Recommended for Granular Solids
Vibrating-Fork-Type-Level-Sensor

Vital

Vibrating Fork Level Sensor

Vibrating fork level switch for free-flowing solids, granules and powders.

Vibrating Rod Level Switch

Vibrosonde

Vibrating Rod Level Sensor

Vibrating rod type level switch for free flowing solids and grains.

Rotary Paddle Level Sensor

Orbit

Rotating Paddle Level Sensor

Stepmatic rotary paddle level switch used in most of the powders and granular solids.

Rotary Paddle Level Sensor

Capvel-ICT

Capacitance Level Sensor

Capacitance based level transmitter used for continous monitoring of grains and powder.

Powder Form - The powder form is also a class of granular material in which particle size are very small. The granular material are crushed or grinded to make the powder form.

Examples of Powder Form
Flour - Powder form

Flour

Spices - Powder Form

Spices

Milk Powder - Powder Form

Milk Powder

Factors to be considered
  • Stickiness - Some powder create coating on the level sensors as it contains some moisture during processing of material so it will be benificial to choose level sensors that are immune to build-up.
Products Recommended for Powder Form
Vibrating-Fork-Type-Level-Sensor

Vital

Vibrating Fork Level Sensor

Vibrating fork level switch for free-flowing solids, granules and powders.

Rotary Paddle Level Sensor

Orbit

Rotating Paddle Level Sensor

Stepmatic rotary paddle level switch used in most of the powders.

Admittance based Level Sensor

Coat-Endure

RF Admittance Level Sensor

Compact coat-immune admittance level switch for sticky solids, pastes and slurries.

Admittance based Level Sensor

SLA Series

RF Admittance Level Sensor

Compact coat-immune admittance level switch for sticky solids, pastes and slurries.


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