Q-meter works on the principle of Series Resonance
A Venturi meter works based on the principle of Bernoulli's equation, which states that an increase in fluid velocity results in a decrease in pressure. The Venturi meter is a device that measures the flow rate of a fluid by creating a pressure difference between two points in a pipe, allowing for flow rate calculations based on this pressure difference.
basic principle of analogue clamp meter
THE SYMBOL FOR Flow Meter is : FI as Flow Indicator
The above is the symbol of flow meter.
Micro Motion flow and density meters utilize Coriolis measurement technology to measure mass flow directly in addition to density and temperature (multi-variable capability). Coriolis meters represent an elegant technology that provides accurate, repeatable measurement independent of fluid properties such as density or viscosity (light, sweet to heavy, viscous crude). Because of this, Micro Motion meters can be used to measure crude flow and density (API gravity). Additionally, since Micro Motion meters do not have any moving parts; there is minimal maintenance and is unaffected by BS&W content that can damage traditional flow meters. Micro Motion meters are utilized extensively for crude production allocation and custody transfer (pipeline and loading/unloading).
CLAMP METER WORKS WITH THE PRINCIPLE OF HALL EFFECT..
One can recalibrate a flow meter by having a company or owning a flow meter supplier or using a flow meter lab. No matter what type of flow meter they need to be checked to see if they need to be recalibrated regularly.
The flow range of a gas flow meter is the range of flow rates that the meter is capable of measuring accurately. It typically includes a minimum and maximum flow rate that the meter can reliably detect and measure. It is important to ensure that the flow rates being measured fall within the specified flow range of the gas flow meter for accurate readings.
rota meter
A Venturi meter is a device used to measure the flow rate of fluids in a pipeline. It consists of a converging section followed by a throat and then a diverging section. The pressure difference between the converging and throat sections is used to determine the flow rate of the fluid passing through the device.
I believe it depends on what kind of flow meter you are looking for. They can range from 19.99 and go up. The more expecive it gets the better the flow meter.