Performance evaluation of the Enraf-Nonius Model 872 radar gage

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There are indications that the Enraf-Nonius Radar Gage installed in Tank 241-SY-101 may not be providing an accurate reading of the true surface level in the waste tank. The Pacific Northwest Laboratory (PNL) performed an initial study to determine the effect of the following items on the distance read by the gage: Tank riser; Material permittivity and conductivity Foam; Proportion of supernatant to solid material in the field of view of the instrument; Physical geometry of the supernatant and solid material changing in the field of view with respect to time; and Varying water content in the solid material. The ... continued below

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Pages: (41 p)

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Peters, T.J. & Park, W.R. December 1, 1992.

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Description

There are indications that the Enraf-Nonius Radar Gage installed in Tank 241-SY-101 may not be providing an accurate reading of the true surface level in the waste tank. The Pacific Northwest Laboratory (PNL) performed an initial study to determine the effect of the following items on the distance read by the gage: Tank riser; Material permittivity and conductivity Foam; Proportion of supernatant to solid material in the field of view of the instrument; Physical geometry of the supernatant and solid material changing in the field of view with respect to time; and Varying water content in the solid material. The results of the tests indicate that distance measured by the radar gage is affected by the permittivity, conductivity, and angle of the target surface. These parameters affect the complex input impedance of the signal received by the radar gage to measure the distance to the target. In Tank 101-SY, the radar gage is placed on top of a 12 in. diameter riser. The riser affects the field of view of the instrument, and a much smaller target surface is detected when the radar beam propagates through a riser. In addition, the riser acts as a waveguide, and standing waves are enhanced between the target surface and the radar gage. The result is a change in the level measured by the radar gage due to changing properties of the target surface even when the distance to the target does not change. The test results indicate that the radar will not detect dry crust or foam. However, if the crust or foam is stirred so that it becomes wet, then the crust or foam became detectable. The level read using the radar gage decreased as the moisture in the crust or foam evaporated.

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Pages: (41 p)

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OSTI; NTIS; GPO Dep.

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  • Other: DE93005085
  • Report No.: PNL-8464
  • Grant Number: AC06-76RL01830
  • DOI: 10.2172/6942711 | External Link
  • Office of Scientific & Technical Information Report Number: 6942711
  • Archival Resource Key: ark:/67531/metadc1188333

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Office of Scientific & Technical Information Technical Reports

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Creation Date

  • December 1, 1992

Added to The UNT Digital Library

  • July 2, 2018, 10:52 p.m.

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  • Aug. 14, 2018, 12:19 p.m.

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Peters, T.J. & Park, W.R. Performance evaluation of the Enraf-Nonius Model 872 radar gage, report, December 1, 1992; United States. (https://digital.library.unt.edu/ark:/67531/metadc1188333/: accessed March 18, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.