Following are the major advantages associated with techniques of level measurement using differential pressure.
- Differential pressure based level sensors can be easily mounted or retrofitted to the surface of the vessel.
- To carry out maintenance and testing, these sensors can be provided with block valves for isolating them carefully from the process liquid.
- They can be easily applied in level measurement applications such as total level in separator vessels where other level measurement devices are not feasible owing to the extensive changes in material formation experienced in the upper state.
Use of differential pressure transmitters includes few drawbacks too, which are mentioned below:
- Errors can get introduced in the measurements if the density of the process fluid varies because of reasons such as temperature variations or change of process. Hence, the density of the process must always be maintained constant in order to get accurate results.
- Differential pressure transmitter works well with clean liquids only. Besides, it necessitates two vessel penetrations for its operation, out of which one is installed near the vessel base where leakage happens.
- Their use is always avoided with liquids such as paper pulp stock since they result in solidification upon rise in their concentrations.