Last Updated on November 26, 2023 by Hina Rubab
Table of Contents
About Flow Meter
It is considered to be a precision measurement to measure the rate of liquid or gas flow within the pipe.
Characteristics for flow determination
- While measuring fluid rate over a specific known area, it is possible to determine the gas flow.
- Positive displacement meters are designed to collect fluid in a fixed volume. Then, it releases as well as refills liquid or gas. Tally the number of times capacity fills for determining flow accuracy.
- The other methods are based on forces of the flowing stream since it overpowers a specifically known constriction, thereby calculating indirect flow.
Styles & types
There are available four types of natural gas meters in the market to measure gas flow in the pipe.
- Velocity: In this type, medium rate passing via meter is what determines the measurement. Volumetric flow is measured by turbine flow meters depending on fluid flowing through the free-spinning rotor. They come with high accuracy and turndown.
But its usage is limited to only cleaning dry gasses due to its moving parts within gas applications. Differences noticed in pulse transit-time traveled to the upstream sensor from the downstream transducer are measured by ultrasonic flow meters. A vortex type of gas flow meter is designed with a shedder bar in its flow path.
- Mass Flow: This precision instrument helps measure the rate of gas or liquid flow within the pipe. Four major meter styles are present to measure flow. It determines the mass flow that passes via the meter. The two popular types are:
- Thermal: It measures mass flow depending on heat transferred from the heated element. Measurement is said to be in mass flow, while temperature correction and additional pressure are unnecessary.
- Coriolis flowmeter: It offers direct measurement depending on the deflection force of the fluid moving via the vibrating tube. This Paperless Recorder is highly accurate as well as offers high turndown abilities.
- Positive Displacement: This type of meter is available at SilverInstruments.Com. It requires mechanical displacement of fluid components. It measures volumetric flow but at operating pressure and temperature.
Such devices do come with sufficient temperature compensation, pressure, and accuracy required to derive mass flow. However, their moving parts will require the user to consider gas cleanliness. This meter is known in short as a PD meter or volumetric flow meter, or PD flow meter. The diaphragm meter is one such classic example of this type.
- Differential pressure meters: In this digital flow meter, pressure drop is measured to calculate flow over an obstruction that is inserted into the flow path. The common flow element types are averaging Pitot tubes, venturi tubes, flow nozzles, and orifice plates.
One such meter is the orifice plate which is used frequently to measure natural gas. Volumetric flow is measured and not mass flow. However, it has some limitations like pressure drop, limited turndown, and diminished low flow sensitivity. This, in turn, impacts operating costs.
More About It
Gas flow meters are essential tools for measuring the flow rate of gases in various industrial and scientific applications. There are different types of gas flow meters, each with its own unique style and working principle. In this article, we will explore the different styles and types of gas flow meters used for measurement purposes.
- Differential Pressure Flow Meters Differential pressure flow meters work on the principle of measuring the pressure drop across an obstruction placed in the gas flow path. This pressure drop is then correlated to the flow rate of the gas.
- Thermal Flow Meters Thermal flow meters measure the heat transfer rate from a heated element in the gas flow path. As the gas flows over the heated element, it cools down, and the heat transfer rate is proportional to the gas flow rate.
- Coriolis Flow Meters Coriolis flow meters work on the principle of measuring the change in the oscillation frequency of a vibrating tube filled with gas. The frequency change is proportional to the mass flow rate of the gas.
- Ultrasonic Flow Meters Ultrasonic flow meters use ultrasonic waves to measure the flow rate of the gas. The sound waves are transmitted through the gas, and the time taken for the wave to travel upstream and downstream is used to determine the flow rate.
- Turbine Flow Meters Turbine flow meters work on the principle of measuring the rotational speed of a turbine placed in the gas flow path. The rotational speed is proportional to the flow rate of the gas.
- Vortex Flow Meters Vortex flow meters measure the frequency of vortex shedding caused by a bluff body placed in the gas flow path. The frequency is proportional to the gas flow rate.
Getting to know the types and choosing the best Digital flow meters for Water is likely to help increase overall productivity.
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