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Descriptions of various types of flow meters - part 2

Gas Flow Meters While many of the flowmeters designed to work with liquids can be used with gases there are specific tools that are designed to work best with gases. Flowmeters designed to work with gases can measure flow rate or flow volume depending on the specific design. While it is often true that flow meters for gas and liquids can be used for either type of substance you should carefully consider your specific application and product literature.

Ultrasonic Flow Meters The ultrasonic flowmeter is designed to work well with "dirty" liquids or liquids that have particulates or bubbles in the flow. Ultrasonic flowmeters requires that the substance be conductive and will not work with distilled water or other clean liquids without first introducing bubbles by aerating the liquid.

Level Sensors To measure the level of liquids or powders you can use a level sensor as there is no flow to measure. There are two general types of level sensors, point value and continuous. The continuous level sensors give constant data to a monitoring system or via a display. The point value level sensors are often used as part of a warning system sending an alert when the level has reached a maximum or minimum level.

Magnetic Flow Meters and Insertion Magnetic Flow Meters This type of flowmeter is known as a magnetic flowmeter, electromagnetic flowmeter or induction flowmeter. These are designed to work with conductive fluids and measure flow across a controlled field that is magnetized. With the lack of any moving parts these are less prone to wear and maintain accuracy longer. Common applications for the magnetic flow meters include wastewater flow measurement and other conductive liquids.

Wedge Flow Meters The wedge flow meters have a wide range of liquids they can work with both clean and dirty liquids. They are often found measuring flow in liquids that have solids suspended in the flow, slurries and viscous liquids.

Turbine Flow Meter The turbine flow meters measure flow rate in a pipe or channel using a rotor that spins as the substance flows past the blades causing them to turn. The flow rate is determined by the speed of rotation. The rotation is counted using some type of sensor such as gears, magnetic pickup or photoelectric cells.

Ultrasonic Level An ultrasonic sensor is usually used as a level sensor. This type of sensor is mounted in the top of a tank or container and send a high frequency sound down to the area they are sensing. This continuous high frequency sound is bounced off the substance it is sensing back up to the sensor. The time it takes for the sound to travel back and forth is measured and correlated to attain the level. These operate within certain temperature ranges so it is important to choose the one that is rated for you the temperature range of your tank.

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