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Inst Tools > Blog > Practical Questions > Calculate 0%, 50%, and 100% Calibration Points for ΔP transmitter

Calculate 0%, 50%, and 100% Calibration Points for ΔP transmitter

Calculate 0%, 50%, and 100% calibration points for the ΔP transmitter to measure liquid level in the vessel for wet leg and dry leg.

Last updated: November 14, 2020 11:02 am
Editorial Staff
Practical Questions
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Calculate the 0%, 50%, and 100% calibration points for the ΔP transmitter to measure liquid level in this vessel, given a range of 0 to 30 feet and a specific gravity of 0.85.

Contents
Dry LegWet LegRead Next:

Note that the “low” side of the transmitter connects to the top of the vessel to compensate for vapor pressure inside the vessel. This tube (or leg) is called a “dry leg” because there is no liquid inside of it:

Dry Leg

Dry Leg

Now suppose the vessel is heated, and the liquid inside the vessel emits condensible vapors. These vapors will condense inside low-side tube leading to the ΔP transmitter which is cooler than the storage vessel, resulting in a “wet leg” instead of a “dry leg.”

In other words, the transmitter will now “see” a constant column of liquid (SG = 0.85) 30 feet high connected to its “low” process port:

Wet Leg

Wet Leg

Re-calculate the 0%, 50%, and 100% calibration points for the ΔP transmitter to measure liquid level in this vessel with a wet reference leg instead of a dry reference leg.

Answers:

Calculate 0%, 50%, and 100% Calibration Points for ΔP transmitter

Share your answers with us through below comments section.

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Credits: Tony R. Kuphaldt

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3 Comments
  • mubin says:
    November 16, 2020 at 6:18 am

    why u put the answer use 50mA?

    Reply
    • shah says:
      November 16, 2020 at 9:44 am

      As per the image, I think it is assumed 10 to 50 mA as output current range of DP transmitter.

      Reply
  • chin weng fong says:
    November 22, 2020 at 5:59 pm

    how to install calibration range and full range and check distance

    Reply

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