【gas transmitter】Diverse Usage of the Liquid Measurement Sensors | en.ofweek.com

Level measurement and indicator  devices and methods are integral part for processing control in many  different industries. There are two different types of level measurement  sensors;

• Point level measurement sensors:  these are used  for marking the height of single discrete liquid that is a present level  condition. It is generally used as low alarming or for over fill  alarming condition and is one of the methods of liquid level indication.
• Continuous  level sensors: these are more sophisticated type of liquid level  indicators. They can be used to monitor the level of the complete  system. They measure the range of the fluid level instead of measuring  the level just at one point or place. This results in production of an  analog output which correlates directly with the level in the vessel.  The process control loop and visual indicator is directly connected to  the output signal for the creation of the level management system.

There  are different devices and level measurement sensors available in the  market. But before deciding which level measurement sensor you need to  buy, you should keep some questions in mind.

• Whether you are measuring the liquid or gas?
• What are the ranges of application temperature and ranges of pressure?
• Whether you require to measure point level or continuous measurement?
• Which range of level measurement you need?
• Is the measured material good electrical conductor?
• Is turbulence, foam or vapors takes place on the liquid surface?
• Do you need a contact or non-contact measurement level?
• Do you need analog, digital, relay or any other kind of output?

After  you have a clear answer to these and other related questions you can  look out for the right measurement sensor. There are different designs  and variations available in measurement level sensors. Some of the  sensors measure the point level while others are continuous level  sensors. There are float switches, non contact ultrasonic level  indicator sensors, contact ultrasonic sensors, hydrostatic sensors,  optical sensors and capacitance level sensors.

The float  switches, optical sensors and conductive sensors are the point level  measurement indicator sensors while hydrostatic sensors, capacitance  sensors and ultrasonic sensors are the continuous level measurement  sensors.

The principle function of liquid level indicators is to  make sure that all the industrial operations work smoothly due to their  ability to monitor and control liquid levels in big trucks vessels and  pipelines in different kinds of industrial organizations. The ultrasonic liquid level indicators are distinctive from the other kinds of indicators due to the reason  that it is not placed in direct contact with the liquid instead it acts  as a radar which emits high frequency acoustic waves with the frequency  range of 20 KHz to 200 KHz directly towards the liquid. The signal which  it reflects is detected by the transmitter. A table is then used for  the translation of time that a particular wave frequency takes to travel  through air. Then the distance it takes to reach from the surface of  the liquid to the transmitter is calculated through simple subtractions  which provide the liquid level.
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