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Cost Effective Specific Gravity Measurement

Supplier: Endress+Hauser Australia

Endress+Hauser is now offering a simple, cost-effective solution for measuring specific gravity in slurries.

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Suitable for industries such as coal, the system uses ceramic Cerebar PMC71 pressure transmitters, to provide a system that is far cheaper than nucleonic systems and provides higher accuracy and long term stability compared to capillary DP systems.

How it works


Two PMC71 pressure transmitters are flush mounted at a known distance on a raising main pipe and the absolute pressure at each point is fed to a field indicator. As the pressure difference between the two transmitters is directly proportional to the specific gravity, the field indicator can calculate the specific gravity of the medium inside the pipe. This value is then transmitted to the control system.

The other advantages of this system are:

  • Abrasion resistant thanks to the flush mounted ceramic transmitters
  • Measurements are unaffected by temperature as there are no oil filled capillaries
  • No requirement for nucleonic licenses  

SG Measuring ranges are almost infinite and are limited only by the possible distance between sensors. Within these confines, accuracies as good as 0.05% are achievable. Process temperatures up to 150 degrees C and a selection of 316L, Hastelloy C276, PVDF and even Monel, are available as wetted parts.

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