Since the flow transmitters feature an electronic circuit, it is possible to control and monitor the fluid flow using these devices. The following are a few significant differences between flow transmitters and flow meters. Now that the differences between the flow transmitters and flow meters are known, you can select the suitable one for you. Certainly, flow transmitters can be helpful in measuring, monitoring, and controlling the flow rate if your application requires it all.
However, the quality of the products can make a huge impact on your application, so you must buy from trusted manufacturers or suppliers like The Transmitter Shop. Related Posts. Flow Meter vs Flow Transmitter: Know the Difference Brian Craig November 23, In the fluid transmission system, several types of devices are used to measure and control the process parameters.
A Brief Introduction to Flow Meter A flow meter is an instrument designed for measuring the rate of fluid flow via a fluid transmission system. What is a Flow Transmitter and How it Works? Differences between the Flow Meter and Flow Transmitter The following are a few significant differences between flow transmitters and flow meters. On the other hand, the flow transmitters not only measure the flow rate but also help in controlling and monitoring it.
The flow meters are standard mechanical systems like orifices, venturimeters, etc. Please fill out the following form to submit a Request for Quote to any of the following companies listed on. A flow meter is a flow rate measuring device used to determine the linear or nonlinear mass and volumetric flow of a liquid or a gas.
The many names of flow meters include flow gauge , flow indicator, liquid meter, and flow rate sensor. How they are named depends on their industrial use. Their purpose is to improve the precision, accuracy, and resolution of fluid measure. They are a great investment to improve efficiency, have low maintenance, are easy to use, and are versatile and durable.
Flow meters can measure the volume of a material, its speed, or its mass. Using various calculations, they report mass flow, absolute pressure, differential pressure, viscosity, and temperature. With mass, the main concern is gases, chemical reactions, and combustion. One of the considerations regarding the use of a flow meter is the type of flow, which can be open channel or closed conduit. Open channel is when the flow is open to the atmosphere, where closed conduit is when the flow is in a tube or pipe.
There are several features that need to be evaluated when determining the effectiveness of a flow meter. Remote monitoring, types of data, and the frequency of collection are a few of those factors.
Below is a description of the applications for a flow meter. The list of things a flow meter measures are pressure, temperature, density, viscosity, and vapor pressure, which are displayed as a single reading.
A major function of flow meters is to monitor safety conditions such as toxicity, bubbles, the presence of abrasives, and transmission qualities. In the case of fluids, in a confined pipe, the force that is applied to move the liquid is pressure. The density of the liquid determines the amount of necessary pressure, which indicates the flow rate. When a flow meter is measuring density and pressure, it uses that data to calculate flow rate.
In terms of flowmeters , the measurement of temperature is referred to as thermal flow measurement, which measures heat transfer as a gas flows past a surface.
The design of a flow meter is the primary device, a transducer, and a transmitter combined into a single instrument. Positive flow meters give precise real-time output and accurate measurements with a signal directly connected to the force of the gas or fluid. The output signal is connected to the flow meter system of a turbine or rotator wheel, plate, channel, nozzle, laminar, and pilot table system.
Their design depends on the viscosity of the measured substance, cleanliness of the flow, pressure, temperature, and pipe size. They can be custom manufactured to measure any form of flow. There are two categories of flow meters: gas and fluid or liquid. Fluid flow meters have five subcategories: differential pressure, velocity, positive displacement , mass flow, and open channel.
Differential pressure flow meters use the Bernoulli Equation, which states as the speed of the flow of a fluid increases its pressure decreases. They report the difference between a primary and secondary measurement, where the first measurement causes a change in kinetic energy by directing the air through a hole in the flow meter measured by the second element.
The sub-types of differential pressure flow meters are orifice plates, flow nozzles, venturi flow meters, and rotameters. Orifice Plate Flow Meter Systems measure the change in the pressure of the flow, going from upstream to downstream with the flow being partly blocked in the pipe.
A Flow Nozzle is a simple and less expensive type of venturi meter. The nozzle is held between flanges of pipe carrying the material. A differential pressure sensor measures pressure drop as a measure of the flow rate. Venturi Flow Meters measure liquid flow rate and check the change in pressure, which occurs due to a cross sectional flow area in the flow path. Chemical compatibility should be verified when not using water. Sine wave and Squarewave pulse outputs are typical but transmitters are available for integral or panel mounting.
The rotor of the paddlewheel sensor is perpendicular to the flow and contact only a limited cross section of the flow. Positive Displacement Flowmeters These meters are used for water applications when no straight pipe is available and turbine meters and paddlewheel sensor would see too much turbulence.
The positive displacement flow meters are also used for viscous liquids. Vortex Meters The main advantages of vortex meters are their low sensitivity to variations in process conditions and low wear relative to orifices or turbine meters.
Also, initial and maintenance costs are low. For these reasons, they have been gaining wider acceptance among users. Vortex meters do require sizing, contact our flow engineering. Pitot Tubes or Differential Pressure Sensor for Liquids and Gases The pitot tubes offer the following advantages easy, low-cost installation, much lower permanent pressure loss, low maintenance and good resistance to wear.
The pitot tubes do require sizing, contact our flow engineering. Magnetic Flow meters for Conductive Liquids Available in in-line or insertion style. The magnetic flowmeters do not have any moving parts and are ideal for wastewater application or any dirty liquid which is conductive.
Displays are integral or an analog output can be used for remote monitoring or data logging. Anemometers for Air Flow Measurement Hot wire anemometers are probes with no moving parts. Airflow can be measured in pipes and ducts with a hand held or permanent mount style. Vane anemometers are also available. Vane anemometers are usually larger than a hot wire but are more rugged and economical. Models are available with temperature and humidity measurement. Mass or Volumetric Flow Rate? So you want to measure flow?
The answer would seem to be to purchase a flowmeter. With fluid flow defined as the amount of fluid that travels past a given location, this would seem to be straightforward — any flowmeter would suffice.
However, consider the following equation describing the flow of a fluid in a pipe. Putting this equation into action, the flow of a fluid traveling at an average velocity of a 1 meter per second through a pipe with a 1 square meter cross-sectional area is 1 cubic meter per second. Putting this equation into action, the flow rate will be 1 kilogram per second when 1 cubic meter per second of a fluid with a density of 1 kilogram per cubic meter is flowing.
Without getting into details — a pound is assumed to be a mass unit. Now — which flow do you want to measure? Not sure? In some applications, measuring the volumetric flow is the thing to do. Consider filling a tank. Volumetric flow may be of interest to avoid overflowing a tank where liquids of differing densities can be added. Consider controlling fluid flow into a process that can only accept a limited volume per unit time. Volumetric flow measurement would seem applicable. In other processes, mass flow is important.
Consider chemical reactions where it is desirable to react substances A, B and C. Of interest is the number of molecules present its mass , not its volume. Similarly, when buying and selling products custody transfer the mass is important, not its volume. How much maintenance does a flowmeter require?
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