Process Instrumentation : Level Measurement

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Level measurement of fluids in process equipment is necessary to maintain proper fluid levels in concerned equipment. Every equipment has Normal liquid levels (NLL), high liquid level (HLL) and low liquid level (LLL). Equipment shall ideally  operate at Normal liquid level. Level sensors provide signal to pumps control unit and control valves so that they can take necessary action to maintain liquid level at NLL.

There are various types of level measuring instruments. Some are for local readout, some transmit level information to process control room. Level switches send signal only when level in an equipment goes above HLL or below LLL.

This type of level transmitter includes a sensor wire, connected to a piezoceramic sensor inside …Read More..
Laser level transmitters use the speed of light to measure the level of liquid. A …Read More..
Magnetic level gauge consists of a float, carrying a set of strong permanent magnets, riding …Read More..
This device works on the "Archimede's Principle". It consists of a displacer rod suspended in …Read More..
A bubble tube level instrument consists of a dip tube installed in a tank. This …Read More..
This level measurement works on the principal of dielectric constant. Dielectric Constant of process fluids …Read More..
Nucleonic (gamma) level technology can be used for measuring levels of liquids as well as …Read More..
Radar level transmitter use microwaves to measure the level of fluid in a process tank. …Read More..
This device uses Ultrasonic sound waves to measure the level of a liquid. It consists …Read More..
Float type level switches consists of a float displacer in a chamber. This chamber has …Read More..
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