
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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Flow meters measure the flow of a substance through a pipe. Based on the size of the pipe, the flow meter measures the volume of the substance and how fast it is moving through the pipe.
Mag flow meters measure voltage levels of a liquid that is flowing through a pipe. The Mag flow meter is installed in line with the pipe and the diameter of the pipe should be the exact same size as the pipe carrying the liquid. Within the flow meter piping, there are two field coils located on opposite sides of each other. These field coils will generate an electromagnetic field over the entire cross section of the measuring pipe of the flow meter. Two electrodes that measure voltage are installed in the flow meter on opposite sides of the field coils. These electrodes measure any voltage present in the fluid flowing through the mag flow meter. When fluid starts to flow through the meter, the electromagnetic field will apply a force to the charged particles in the fluid. The positively and negatively charged particles begin to collect on opposite sides of the flow meter piping, forming an electrical voltage. The voltage will be directly proportional to the flow moving through the piping. The higher the voltage, the higher the flow velocity in the pipe. With this information, as well as the cross-sectional size of the pipe, the total volume of fluid that is flowing through the pipe can be calculated.