Differential Pressure (DP) Level transmitter Installed Below Tapping Point

Open Tank Level Measurement (Single Seal Application) Transmitter installed below Tapping Point
Level Measurement Installed Below Tapping Point for Open Tank
This calculation used for open tank level measurement with transmitter installed below tapping point

The formulas for calculating transmitter URV and LRV are as follows:

HP Side or LRV or Transmitter 0% = Hmin.S1 + X.S2

LP Side or URV or Transmitter 100% = Hmax.S1 + X.S2


S1 = Specific gravity of tank liquid.
S2 = Specific gravity of seal liquid.
Hmin = Equivalent head of water at minimum level.
Hmax = Equivalent head of water at maximum level.
X = Distance between transmitter and tapping point.


1. The Parameters H,X can be entered in any units like mmh20, inh20 but must be same

2. If you are using direct tubing from tapping point to transmitter without filling any additional liquid (Like water) that means you are not using any special seal liquid, so S2=S1, Here Specific gravity of Process liquid only considers for both S1 & S2. Hence S1=S2.

The Following tables specifies the seal liquid constant values:


Don't Miss Our Updates
Be the first to get exclusive content straight to your email.
We promise not to spam you. You can unsubscribe at any time.
Invalid email address

10 thoughts on “Differential Pressure (DP) Level transmitter Installed Below Tapping Point”

  1. Sory sir..i am confuse..Before i learn about formula p×g×h..
    But in ur formula for wet leg and dry leg not use..sory sir..i new technician in instrument..i just want to learn more..tq

  2. Hey! Someone in my Facebook group shared this website with us so I came to look it over. I’m definitely loving the information.
    Exceptional blog and terrific style and design.


Leave a Comment