A flowmeter is an instrument which is used to measure the linear, nonlinear, mass or volumetric flow rates of a fluid. The measurement of flow of a fluid, will be measured by quantifying the majority flow of that fluid. It will be done in many ways. It can be quantified in mass or volumetric flow rates such as kilograms per second or liters per second. If provided with the density of the material, the volumetric flow rates can change into mass flow rates and vice versa.

When selecting a flowmeter one should have the clear knowledge of the necessities concerning the actual application. Enough time ought to be invested in the study of the fluid process, its nature and the overall installation. Expected minimum and maximum temperatures should also be bear in mind along with the ordinary operating temperature as well as conditions while choosing flowmeters. While measuring the flow of compressible fluids, volumetric flow rates are meaningless unless density (at times even viscosity) is stable.

In case of incompressible fluids, faults are caused by suspended air bubbles; hence air must be fully removed before the material made contact with the flowmeter. In another velocity sensors, meters could cease functioning if the Reynolds number is extremely low. For instance, Vortex Shedding meters require the value of Reynolds number to be bigger than 20000 so as to perform appropriately. Bearing the above factors in mind, mass flowmeters, that are insensitive to pressure, density and viscosity variations have an upper hand.

Flow Control, as is prominent from the name, could be a method to sense and control the quantity of fluids flowing via a pipe. Flow control helps to raise or decrease the flow rate. It can also be used as warning equipment which manage flow and send a alarm if the flow rate levels are too high or too low. These instruments also assist regulate liquid presence and liquid levels. The smooth flow control devices cover a large range of merchandise, and are intended to assist, maintain, control, meter or analyze the flow of material via pipes, hoses or tubing. The material involved can be gaseous, liquid or semi-solid (including slurries and colloids).

Valves, dispensing valves, level sensing, flow sensing, viscosity sensing, valve actuators, pumps, specific gravity and density sensing are all devices and phenomenon that make flow management possible. Valves are devices that permit unidirectional flow of material through them and thus facilitate preserve, meter, or manage, the flow of materials through tubing, pipes, hoses, or complete systems. Valves are very helpful in this field and are so abundantly employed in all flow controlling devices. Dispensing valves aren't the same as regular valves. They're used for certain special purposes. Pumps are used to transfer materials (liquids, gases, or colloids and slurries) from one place to another.