what is flow meter? which principle used to make it. how it works?

Answer 1

Not real sure of the concept behind this as I have never worked on one. I assume it use a Wheel of some sort that spin with the amount of Volume. Electronic Meters could use a type of sensor that can meter the Volume by different electronic methods such as Ultraviolet light. I will look around and see what Info I can find. This is a good question you ask, that I have never really had a need to ask, now I am curious.
Yea, it depend on the type of application as to the type and function of the meter. Very much to learn here. There are Ultrasonic Meter, Venturi, Magnetic etc. it Awesome. But, the Basic function is to control/meter the amount of whatever you transferring for different reasons.

Answer 2

Flow meter is an instrument which mesures flow rate through any section for e.g. a pipe, in terms of mass or volume per unit time.
There are different types of flow meter working on different principles for e.g. some works on the principle of pressure drop across an orifice or a venturi, in some the speed of a turbine(a rotor with blades) in the flow meter will measure the flow, rotameters are there where position of a floating object in a tube of increasing cross sectional area is caliberated as flow rate, other advanced type even mesures the frequency of the pipe through which it flows(which varies with the flow rate) & are caliberated to measure the flow rate.

Answer 3

In plumbing you can use to differnt forms or flow mesurement. A weir gauge that lets a certain amount to water to flow out every second as water from a tap flows in the faster the rate the further up the gauge the water flows out giveing you a flow rate.
The other is to use a manometer to mesure the flow across a fixed orofice plate that through a calulation pressure measured at the plate has a corralation a flow rate

Answer 4

Several classes. Rotometers use a rotating wheel as one other responded. Rotations per time can be calibrated to volume flow rate, if a liquid them mass lfow rate also. Second class is venturi. Venturi is a necking down of the pipe or tube. The pressure difference between the upstream and downstream sides can be calibrated to the volume flow through the venturi. Used mostly for gases. Third is hot-wire anemometer. Current goes through small wire to heat it up to a constant temperature. Electrical resistance in the wire is measured, and the resistance depends on the temperature of the wire. As fluid flows past, it cools the wire, the measured resistance of the wire goes up and the flow rate can be calibrated.

Answer 5

The first-rate (so much unpolluted) water is the rain water. Leave out the primary five mins after which begin storing it in vessels, quilt those vessels with lids or fabric and you'll be able to use it for ingesting functions for lengthy intervals of time, even an yr. All ancestral residences in south India have such rain water harvesting amenities where the rain water from the roof is accrued in blank gutters and channelised to the garage vessels. Even at present one of the most State Governments in south India have made Rain Water Harvesting obligatory. So take a look at your first-rate to make use of it for ingesting or a minimum of for bathing or within the worst case, for WC flushing.

Answer 6

Force

Answer 7

search (the web) for ISO 5167