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Reading: Open and Closed Tank Level Calculations
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Inst Tools > Blog > Formulas > Open and Closed Tank Level Calculations

Open and Closed Tank Level Calculations

Last updated: April 19, 2019 3:55 pm
Editorial Staff
Formulas Level Measurement
7 Comments
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Open Vessel Level Calculation

Open tank : Level Transmitter installed at HP Tapping Point

Open Vessel Level Transmitter Calculation

Contents
Open Vessel Level CalculationOpen tank : Level Transmitter installed at HP Tapping PointOpen Tank : Level Transmitter Zero Scale above HP Tapping PointOpen Tank : Level Transmitter Installed below HP Tapping PointClosed Tank Level Calculation (Wet Leg)Closed Tank : Level Transmitter installed at HP Tapping PointClosed Tank : Level Transmitter Zero Scale above HP Tapping PointClosed Tank : Level Transmitter Installed below HP Tapping Point

In above example, transmitter installed exactly at HP tapping point i.e. at 0 % Level

Calibration Range

LRV or 4mA point = 1.1 * 0 = 0 inH2O

URV or 20mA Point = Head = 1.1*50” = 55 inH2O

Cal. Range = 0 to 55 inH2O

Open Tank : Level Transmitter Zero Scale above HP Tapping Point

Level Transmitter Range Calculate

In above example, transmitter installed point and Tank Zero Percentage level are different.

Calibration Range

LRV or 4mA point = Head1 = 1.1*10” = 11 inH2O

URV or 20mA Point = Head2 = 1.1*50” = 55  inH2O

Cal. Range = 11 to 55 inH2O

Open Tank : Level Transmitter Installed below HP Tapping Point

Level Transmitter Installed below HP Tapping Point

Calibration Range

LRV or 4mA point = Head1 = 1.1*10” = 11 inH2O

URV or 20mA Point = Head1 + Head2 = (1.1*10”) + (1.1*50”) = 66 inH2O

Cal. Range = 11 to 66 inH2O

Closed Tank Level Calculation (Wet Leg)

Closed Tank : Level Transmitter installed at HP Tapping Point

Wet Leg Level Transmitter

In above example, transmitter installed exactly at HP tapping point i.e. at 0 % Level

Calibration Range

LRV or 4mA point =  Phigh – Plow = 0 – Head1 = 0 – (1.2*70”) = -84”H2O

URV or 20mA Point = Phigh – Plow = Head2 – Head1 = (1.1*50”)] – (1.2*70”) = -29”H2O

Cal. Range = -84 to -29 inH2O

Closed Tank : Level Transmitter Zero Scale above HP Tapping Point

Closed Tank Level Transmitter Zero Scale above HP Tapping Point

In above example, transmitter installed point and Tank Zero Percentage level are different.

Calibration Range

LRV or 4mA point = Phigh – Plow = Head2 – Head1 = (1.1*10”) – (1.2*70”) = -73”H2O

URV or 20mA Point = Phigh – Plow = (Head2 + Head3) – Head1

= [(1.1*10”) + (1.1*40”)] – (1.2*70”) = -29”H2O

Cal. Range = -73 to -29 inH2O

Closed Tank : Level Transmitter Installed below HP Tapping Point

Closed Tank Level Transmitter Installed below HP Tapping Point

Calibration Range

LRV or 4mA point = Phigh – Plow = Head2 – Head1 = (1.1*10”) – (1.2*80”) = -85”H2O

URV or 20mA Point = Phigh – Plow = (Head2 + Head3) – Head1

= [(1.1*10”) + (1.1*50”)] – (1.2*80”) = -30”H2O

Cal. Range = -85 to -30 inH2O

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7 Comments
  • Karuna says:
    May 6, 2016 at 1:39 am

    Easy Calculations & in Understandable way. Thanks Bharadwaj sir.

    Reply
  • imran says:
    May 20, 2016 at 6:57 am

    Sir how to mount dot in for vaccum tank level measurement already we are using magnetic level gauge which works on magnetostrictive principle.

    Reply
  • Teguh says:
    June 1, 2016 at 4:45 am

    Thank you this a simple calculation

    Reply
  • Murthy Gsn says:
    June 23, 2016 at 2:55 am

    It’s really use full & simple calculations sir.Thank you very much sir.

    Reply
  • Ramin says:
    September 10, 2017 at 6:03 am

    I am so happy finding this learning web site. Suggested to my friends as well. Using daily to improve my skills. Thanks for this web site creator.

    Reply
  • Preyad says:
    November 27, 2019 at 5:33 pm

    We have two articles one about zero elevation suppression and one about URV and LRV calibration range. M question is in calibration range we need to include the pressure head in HP tapping or remove? same for suppression.

    Reply
  • Vinayak says:
    February 23, 2020 at 10:57 pm

    How to calibrate LT close tank under vacuum.

    Reply

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