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In this first video of a 2-part series, we’re going to introduce you to Open Vessel level measurement using a Differential Pressure Transmitter.

The second part of our 2-part series will take you through the process of predicting Differential Pressure Transmitter outputs of open and closed tank level control loops. ([ Ссылка ])

Even with the development of new technologies and highly sophisticated level measurement instruments, Differential Pressure Transmitters are still in service today measuring vessel fluid levels.

In this video, we’re going to:

– Discuss the two categories of level measurement
– Talk about the difference between Direct and Indirect methods of continuous vessel level measurement
– Explore how a Differential Pressure Transmitter is used to measure vessel level and discuss variables that influence the measurements

Level measurement can be divided into two categories: point and continuous.

Point level sensors are used to mark a specific single liquid height.
For example, the point level sensor would send a signal to a PLC at a specific level to start a pump.

A continuous level sensor measures the fluid level within a measurement range rather than at a specific single point. Said a different way, continuous level sensors provide level measurement over the full 0% to 100% range of a vessel.

Because we are interested in the height of a liquid in a vessel, we take vertical measurements taken from the surface to a fixed reference point. The reference point is usually near the bottom of the vessel.

You might have noticed that the vessel Reference or Zero percent point is not at the very bottom of the vessel.

This is to make sure that the vessel is never completely drained.

We can take advantage of the fact that the pressure measured at the base of a liquid storage vessel will vary with the height, or level, of the liquid in the vessel.
Armed with that knowledge, we can determine the level of the vessel from the indirect inferred measurement of the pressure.

We don’t have to worry about the size, shape, or volume of the tank because none of those parameters have any effect on the pressure at the reference point.

But, we do have to consider other parameters such as specific gravity and temperature.

Another variable that has a major effect on the pressure at the reference point of the vessel is the relative density of the liquid in that vessel. Relative density is also called specific gravity.

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You might want to review 3 of our other articles:

1) What is a Level Sensor? ([ Ссылка ])

2) What is a Pressure Sensor? ([ Ссылка ])

3) Differential Pressure Transmitter Explained ([ Ссылка ])

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