Calculation Level Calculation

DP Type Level Transmitter Working Principle
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DP Type Level Transmitter Working Principle

DP Type Level Transmitter Working Principle The figure above illustrates a software the place the extent worth is inferred from a power size. When the extent is on the identical elevation level because of the measuring software, atmospheric power is implemented to each side of the power transmitter and the size is at ‘0’ reference degree.

When the extent within the tank will increase, the drive created by the hydrostatic head of the liquid is implemented to the size aspect of the transmitter, leading to a build up within the software output. The software reaction is brought about through the top power is used to deduce a degree worth.

The connection between power and degree is as discussed previous, P = ρ • h • g. Notice that any adjustments in atmospheric power do no longer impact the size for the reason that adjustments are implemented to each side of the power transmitter.

if we’re the use of DP Transmitter then the HP aspect is hooked up to the tank tapping level and LP aspect is the vent to setting or we will use a power transmitter additionally.

DP Type Level Transmitter Working Principle

The DP Transmitter calibration parameters will range relying on set up & seal gadget additionally. In most cases, we will see 3 chances of setting up of a transmitter.


  1. Transmitter put in Precisely at tapping level ( Best & most popular manner of setting up)
  2. Transmitter put in above tapping level ( No longer preferable, Likelihood of bubble formation)
  3. Transmitter put in beneath tapping level (Error will also be compensated successfully)

So we need to calibrate the transmitter relying on the kind of set up within the box. The calibration system will range fairly relying on the setup.Each and every transmitter have two vital parameters, they’re Decrease Vary Price (LRV) & Higher Vary Price (URV). We need to calculate the LRV & URV values in accordance with the form of set up. The beneath figures with formulation dictates the calculations. After calculating the values, configure the similar parameters within the transmitter the use of HART communicator.

Right here we’re discussing two forms of seal programs: with seal & with out seal,

With Seal Machine: The impulse line is stuffed with particular fluid like with glycerine, glycol and so forth

With out Seal Machine: Tank / Vessel fluid will probably be full of the impulse strains

Configuration for Open Tank LEVEL Size

Normal installation (Transmitter mounted leveled with min. level tap)


Regardless of whether with/without seal system;

Span = ρp • g • h ,or alternatively, Span = SGp • h

Elevated-Zero installation (Transmitter mounted above the tapping point)



DP Type Level Transmitter Working Principle

With seal system;

Zero Elevation = − ( ρf • g • h) , or, = − (SGf • h)

Span = ρp • g • H , or, = SGp• H

Without seal system;

Note that this configuration is not advisable because the transmitter tends to be unstable when the liquid level gets below the transmitter level – causing bubble trap unless seal system is used.

Therefore, for calibration;

4mA (LRV) = Zero Elevation

20mA (URV) = Span + Zero Elevation

Suppressed-Zero installation (Transmitter mounted below the tapping point)


DP Type Level Transmitter Working Principle

With seal system;

Zero Suppression = ρf • g • h , or, = SGf • h

Span = ρp • g • H , or, = SGp • H

Without seal system;

(the transmitter leg is assumed to be filled with process fluid at all time)

Zero Suppression = ρf • g • h

Span = ρp • g • H , or, = SGp • H

Therefore, for calibration;

4mA (LRV) = Zero Suppression

20mA (URV) = Span + Zero Suppression


ρp = density of process liquid in the tank
SGp = std. the gravity of process liquid.
ρf = density of fill-liquid in the tubing
SGf = std. the gravity of fill liquid
H = Tank Height ( measured level)
h = transmitter installed height from the HP tapping point

Watch video DP Type Level Transmitter Working Principle

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