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Reading: Open Tank DP Level Transmitter Calculations
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Inst Tools > Blog > Formulas > Open Tank DP Level Transmitter Calculations

Open Tank DP Level Transmitter Calculations

Open Tank DP Level Transmitter Calculations for DP Transmitter installed at the exact at HP tapping point and below HP tapping point of the tank.

Last updated: September 21, 2020 4:57 pm
Editorial Staff
Formulas Guest Articles Level Measurement
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In any process industry, level measurement is very important for safety and process purpose.

Contents
DP Transmitter Level Measurement for Open TankDP Transmitter installed at the exact HP tapping pointDP Transmitter Installed Below Tapping Point for Open Tank

Level can be measured by two methods.

  1. Direct method
  2. Indirect method

Here we discuss about indirect method and which is using DP transmitter for level measurement.

A Differential pressure transmitter is a common and well understood technology for liquid level measurement. If the tank is closed or pressurized, a DP measurement must be made to compensate for the vessel pressure.

DP Transmitter Level Measurement for Open Tank

Suppose there is a open tank in which a DP transmitter installed for the measurement of level then HP leg of the DP transmitter is connected with bottom of tank and LP leg is open in atmosphere. Assume process fluid specific gravity in the tank is 1.0

Definition of specific gravity: Specific gravity is a measure of density relative to the density of a reference substance. Reference substance is taken water.

For DP Transmitter Configuration, we have to find out Zero Level & Span Level. Accordingly we have to configure Lower Range Value (LRV) and Upper Range Value (URV) using HART communicator.

DP Transmitter installed at the exact HP tapping point

Open Tank DP Level Measurement

At Zero level = 0 mmwc
At Span level = H x Specific gravity

= 500 x 1.0

 = 500 mmwc

Then Range = 500 – 0 = 500 mmwc

So, we have to set Lower Range Value (LRV) = 0 mmwc and Upper Range Value (URV) = 500 mmwc in the DP Transmitter using HART communicator.

DP Transmitter Installed Below Tapping Point for Open Tank

If transmitter is installed below the tank then it’s called zero suppression then calculation is below:

DP Transmitter Installed Below Tapping Point for Open Tank

When zero suppression is used then H1 height always filled with process fluid.

At zero level (LRV) = H1 x specific gravity

= 100 x 1.0

= 100 mmwc

At 100% level (URV) = (H1 + H2) x specific gravity

= (100 + 500) x 1.0

= 600 mmwc

Range = URV – LRV = 600 – 100 = 500 mmwc

So, we have to set Lower Range Value (LRV) = 100 mmwc and Upper Range Value (URV) = 600 mmwc in the DP Transmitter using HART communicator.

Author: Ashish Agrawal

Read Next:

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  • DP Transmitter Zero Suppression
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7 Comments
  • Kalyani bahubali says:
    March 10, 2018 at 4:11 am

    Very good knowledge…..

    Reply
    • Gajendra Maida says:
      June 28, 2025 at 2:25 pm

      Best

      Reply
  • Kevin says:
    August 3, 2021 at 3:17 pm

    Wonderful piece, I enjoyed it all the way.

    Reply
  • Alam Shabaz says:
    November 6, 2022 at 7:35 pm

    If LRV = 100 And URV = 600 Then What is This
    Range 500 mmwc

    Reply
    • TANK says:
      August 1, 2024 at 8:15 pm

      SPAN RANGE 500 MMWC

      Reply
  • Joe says:
    November 15, 2022 at 2:38 am

    Great Info I appreciate

    Reply
  • Mohan Krishna says:
    February 29, 2024 at 1:54 pm

    Dear sir kindly update for calibration procedure for Gas sensors

    Reply

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