Selecting Best Solids Level Measurement Technology

Engineers have been grappling with solids level and volume measurement for a number of years. As a result, numerous technologies have been developed to provide the most accurate measurement techniques.

The three main technologies for solids measurement are:

Guided wave radar

Non-contacting radar

Acoustic 3D solids scanners

However, as well as the technologies, the characteristic of the solids being measured is of vital importance.

Factors that affect the measurement of solids include:

Evenness of surface

Dieelectric constant of the solid

Bulk density

Filling location

Dust

Condensation

Whether level or volume is the measurement sought

Solids on an uneven surface are best measured by guided wave radar and measured the least accurately by non-contacting radar as the radar signal may bounce at an angle.

Acoustic 3D solids scanners are immune to dielectric constants but not to bulk density. On the other hand, reflected radar signal is affects by dielectric constant but not bulk density.

Solids in dusty environments are best measured by radar and acoustic measurements rather than ultrasonic and laser measurement. However, if the dust is sticky, the antenna surface must be treated with non-stick materials.

Guided wave radar is well suited to vessels with condensation as is acoustic 3D solids scanners, as they have self-cleaning mechanisms to manage condensation. Non-contacting radar though, is affected by condensation and may require air purging systems for optimal operation.

Radar devices are the optimal selection if solids level measurement is the primary consideration and fast level changes are involved - unless the dielectric constant is too low or the distance between the radar and the level surface is great, then anAPM 3D Solids Scanneris the best choice.

Similarly, 3D solids scanners are the perfect choice if volume measurement is sought (usually for inventory management). This is due to the fact that multiple measurements help integrate uneven surfaces and provide more accurate volume measurements. TheAPM 3DLevelScannerVis a good choice for medium silos and the APM 3DLevelScannerSfor medium to large silos.

By now it should be apparent that not all solids measurement devices were created equal and that there is no single device applicable for all types of solids and their storage characteristics. However, once the optimal device for a specific purpose is selected, it is imperative that adhering to the mounting and installation instructions is required to attain the best results.

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