# Different Configurations of DP transmitter for level, density measurement

**Differential Pressure Transmitter (DPT)** are used to measure level in process tanks which compares the pressure measurement between

### General Differential Pressure Transmitter Methods:

There is a variety of system arrangements for determining density from measurements of hydrostatic heads using differential pressure (DP) transmitters

### DPT transmitter with a Wet Leg:

Applications with fluctuations in level or static pressure require compensation. Under these conditions, there are three basic density measurement arrangements.

A wet leg is installed between the lower and upper opening which is filled with a fluid that will sealed so that it won’t combine with the process fluid.

First, if a

### DP Transmitter with a Pressure Repeater:

Pressure repeater for the upper connection. This instrument reproduces any pressure that exists at the B connection in one form, from full vacuum to approximately 250 Pa positive pressure.

The repeater transmits to the low – pressure side of the DP transmitter the total pressure at elevation B. This subtracts the pressure at height B from the pressure at height A.

Special consideration should be given when using the repeater method for vacuum applications where the overall pressure on the repeater is lower than atmospheric.

### DP Transmitter with Bubble Tubes:

This very simple system consists of two

The difference Tp in hydrostatic pressure at both points is measured by a DP transmitter connected between these tubes, with the higher – pressure side associated with the lower V notch.