# Level Measurement

## Zero Suppression and Zero Elevation

What is Hydrostatic Pressure? Theory of Hydrostatic Pressure: If we consider a little cube of liquid that is at rest below a free surface, then the pressure that is created by the height of the liquid that is above this small cube must be balanced by a pressure that is resisting being applied to it. …

## Open and Closed Tank DP Level Calculations

Open Vessel Level Measurement Calculation a) Example calculation for the transmitter installed in zero-based direct mount application The Calibration Range may be computed using the following method: At zero percentage of level (for 4mA output) Pressure = 1.1 X 0 (head level is 0”)                   At 4 mA = 0”H2O At 100 percentage of …

## Troubleshooting of DP Type Level Transmitter

A differential pressure transmitter measures the pressure difference between the liquid and gaseous phases of a fluid within a closed tank to determine level. As an inferential measurement, level is measured using a DP Transmitter device. The diaphragm of a DP Transmitter detects the head pressure generated by the height of the fluid within the …

## Working and Types of Manometer

What is the working principle of a manometer? Describe various types of manometers used to measure pressure: Several types of manometers are used to measure pressure as laboratory or local indicating equipment 1. U-Tube Manometer: P1-P2 = (ρ-ρ1)*(h1-h2)*g  In general P1-P2=ρ*h*g Where ρ= Fluid Density h= Height g= Gravitational Constant = 9.8 ms-2 P2-P1 = …

## Ultrasonic Level Transmitter

Working Principle of Ultrasonic Level Transmitter: Distance (S) = [Speed of Sound in Air(C) * Time Delay (T)]/ 2 Where S:  Actual Distance to be measured, C: Speed or velocity of sound in air, T: Time Delay Level = Tank Height – Distance Minimum Measuring Distance (Xm): Maximum Measuring Distance (XM): Installation guidelines for Ultrasonic …

## What is a level sensor and what are their types?

Level sensors are devices that are used to measure the substances, such as water, oil, slurries, dust particles, solids, etc. The medium which is to be measured could be stored in a vessel, bins, silos, etc. The liquid level is the position of a liquid surface above or below a reference point. These sensors are …

## What are the types of industrial sensors used in the Process Industry?

What is a sensor and what are industrial sensors? A sensor would measure a physical quantity and it would create a corresponding electrical signal according to the physical quantity. An industrial sensor is a device that would react to a physical quantity such as heat, light, sound, pressure, magnetism, motion, etc, and it would be …

## What is an inductive level sensor?

We can use the inductive level sensors for liquid metals that are capable to conduct electricity. So it is capable to detect the level of conductive liquids and solids and also it can be used to determine the interface between the conductive and non-conductive liquids. In order to use this level measuring device the container …

## What is an ultrasonic level sensor?

The ultrasonic sonic sound is above the human hearing range and it is used to do the level measurement. The sound frequencies which are above 20 kHz are ultrasonic frequency, ultrasonic waves are used to measure the level of solids and liquids in industries. This device can be used to do continuous or single point …

## What is a variable displacement level device and how does it measure the level?

The working of this type of level measuring device is based on the Archimedes principle of buoyancy. According to the Archimedes principle, a body that is immersed in a liquid will be buoyed up by a force equal to the weight of the liquid it displaces. There will be an upward pressure which will be …

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