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Level Measurement by Weight

Level Measurement by Weight

Measuring level or inventory by weight is the most accurate technology. The weight is not affected by ingredients that foam or settle unevenly, by changes in density, internal mechanical bracing, or shape of the tank. Weight is weight, regardless of percent solids, bridging, rat holing, or whether your ingredient is conductive or sound absorbing.

Because weighing is a non-contact method of measuring level, there is no chance of contamination. No matter what your mix of ingredients, weighing can measure:

  • Solids and liquids
  • Slurries and gases
  • Fluctuating densities
  • Any percent solids
  • Caustic ingredients
  • Foaming materials
  • Ingredients that settle unevenly

Instrumentation and Control

Hardy's instrumentation ranges from blind transmitters to digital weight controllers. They can be connected to host computers, programmable logic controllers (PLCs), or Distributed Control Systems (DCS). Total net weight can be viewed or transmitted. Bar graphs, lights, and other large indicators are often used for long-distance viewing.

In addition to level measurement, the instrumentation can also control the filling and dispensing of the storage vessel. To weigh a storage vessel, it must be supported entirely by load cells. For example, a silo would have a load point assembly (load cell & mounting hardware) under each leg. A frame is constructed to transfer the weight of a skirted silo to three or more load points. Some vessels can also be hung in tension to save valuable production space.

Horizontal storage tank saddles are retrofitted with load points to accommodate vessel expansion and contraction with changes in temperature.

Calibration of Large Vessels Made Easy

Hardy's C2® electronic calibration, eliminates costly scale calibration fees, especially on large storage vessels. C2 allows you to electronically calibrate even with the material in your vessel. With large systems, this feature can pay for itself in just one calibration cycle.

Advantages of using Hardy weight processing in level measurement operations:

  • Lower long term costs
  • Accurate weight/level
  • Reduced downtime for installation or repair
  • Eliminates test weight related personnel injuries
  • Ends material substitution contamination and disposal issues
  • Operates at high speed to seamlessly integrate into the production process
  • Quality - consistent customer satisfaction
  • Legal compliance – reduced fees and compliance costs; security in continued operation

For more information, check out our Level Measurement vs Weight and Industry 4.0 Application Note.