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Formulas Level Measurement

Open and Closed Tank Level Calculations

Open Vessel Level Calculation

Open tank : Level Transmitter installed at HP Tapping Point

Open Vessel Level Transmitter Calculation

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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5 comments

Karuna May 6, 2016 at 1:39 am

Easy Calculations & in Understandable way. Thanks Bharadwaj sir.

Reply
imran 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 June 1, 2016 at 4:45 am

Thank you this a simple calculation

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

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

Reply
Ramin 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

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Open and Closed Tank Level Calculations

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