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Dp level calibration/sensor trim

I need a full understand of 3051 calibration/sensor trim/characterization curve. Could Rosemount provide a schematic diagram to demonstrate What the relationship between sensor trim and 4-20mA. For example "Select pressure input values so that lower and upper values are equal to or outside the 4 and 20 mA (1 and 5 Vdc) points."       

Thanks for help

Qi Lou

Daniel Qi Lou

qi lou
  • qi lou
    For example, the level range is 0-200mbar, the original upper calibration point is 200 lower calibration point is 0. For some reason, I did sensor trim from 30 to 150mbar, what will happen to the characterization curve and transmitter performance?

    Daniel Qi Lou

  • Jonas Berge
    You can refer to the calibration trim tutorial found here:
    www.eddl.org/.../Calibration.aspx
    These are generic principles, the same that apply to all transmitters

    See for instance figure 7. The 4-20 mA range is from LRV to URV. For best measurement result sensor trim shall be done at the LRV and URV trim or outside these points so that you are either measuring spot on the trim points, or interpolating within the trim points. The sensor trim shall not be done for a smaller range somewhere between LRV and URV because then at some points the measurement will be extrapolating outside the trim points. This is a general principle so it applies to any brand or model of measuring device.

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