Flow Meters & Transmitters
Flow meters are devices that measure the amount of liquid, vapor or gas that passes through them. Flow meters consist of a primary device, a transducer and a transmitter. After the transducer senses the liquid or gas that has passed through the primary device, the transmitter will create a usable electrical signal that can be transmitted and received by other control devices or instruments. There are several things to consider when selecting a flow meter. The type of media to be measured: liquid, vapor or gas. The flow measurement type: velocity, volumetric or mass. The pressure and temperature of the media. The required flow range and accuracy.
Velocity flow meters, such as magnetic, ultrasonic, turbine and vortex, measure the rate of the liquid or gas passing through the device.
Volumetric flow meters, such as positive displacement flow meters, directly measure the volume of liquid passing through a specific location in a set period of time. They provide an immediate digital, analog or pulse output of the volumetric flow rate.
Mass flow meters, such as thermal and Coriolis, measure the mass flow of the flowing stream per unit of time.
Differential flow meters, such as orifice plates and averaging pitot tubes, calculate flow by measuring pressure drop over an obstruction inserted in the flow path.
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