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Density Measurement using DP Transmitter for closed tank with wet leg

In closed tanks, the DP transmitter must compensate for the pressure of the vessel above the liquid surface. So the LP side of transmitter is connected to the tank. Here in this post we are discussing about calibration of DP transmitter for a closed tank with wet leg & constant level application for density measurement. This is only used for constant level application.

Density Measurement using DP Transmitter

Density Measurement using DP Transmitter for closed tank with Wet Leg
Density Measurement using DP Transmitter for closed tank with wet leg

The minimum and maximum process specific gravities can be obtained from process datasheets.

The formulas for calculating the tranmitter LRV and URV are;

HP Side/LRV/4ma = L.Smin – H.Sref

LP Side/URV/20ma = L.Smax – H.Sref

Where

L = Closed tank maximum measured level
H = Height of wet leg
Smax = Maximum process specific gravity
Smin = Minimum process specific gravity
Sref = wet leg or reference leg specific gravity

Note: This calculation is only used for closed tank with wet leg and for constant level application.

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4 comments

Apiwat February 17, 2016 at 3:22 pm

Need to learn Instrument .

Reply
abdulrahman February 24, 2016 at 9:04 am

yes you all right

Reply
Muralidharan March 24, 2016 at 4:36 am

Sir what is dry&wet leg???
I can’t understand about Dp transmitter function.. So kindly give the dp function & working….

Reply
SERAJ AHMAD May 9, 2016 at 10:40 am

dry leg and wet leg both are impuls line,
wet leg means impuls line used to other liquid so specific gravity is different to the tank liquid.
dry leg both are used same specific gravity that means tank and impuls line are same liqid.

Reply

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Density Measurement using DP Transmitter for closed tank with wet leg

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