what is water meter?
water meter is a device used to measure water usage. This article provides an overview of technical aspects of water meters. The worldwide prevalence of metering as well as its economic benefits and costs are covered in the separate article on water metering.In most developed countries, water meters are normally used at each residential and commercial building in a public water system. Water meters can also be used at the water source, well, or throughout a water system to determine flow through that portion of the system. Water meters typically measure and display total usage in cubic feet, cubic meters or US gallons on a mechanical or electronic register.
There are three common methods of flow measurement in use:
-Displacement
-Velocity
-Electromagnetic
Displacement meter
This type of water meter is most often used in residential and small commercial applications. Displacement meters are commonly referred to as Positive Displacement, or "PD" meters. Two common methods of positive displacement measuring are Oscillating Piston meters and Nutating Disk meters. Either method relies on the water to physically displace the moving measuring element in direct relation to the amount of water that passes through the meter. The piston or disk moves a magnet that drives the register. PD meters are generally very accurate at low to moderate flow rates typical of residential and small commercial users, and are common in sizes from 5/8" to 2". Because displacement meters rely on all flowing through the meter to "push" the measuring element, they generally are not practical in large commercial applications requiring high flow rates or low pressure loss. PD meters normally have a built in strainer to protect the measuring element from rocks or other debris that could stop or break the measuring element. PD meters normally have bronze, brass or plastic bodies with internal measuring chambers made from molded plastics and stainless steel.
Veocity meter
A velocity meter measures the velocity of flow. though a meter of a known internal capacity. The speed of the flow can be change into volume of flow for usage. There are many type of meter that measure water flow velocity to determine totalizes usage.
2.1 Muti-jet meter
Muti-jet meter are very small size and are commonly used in 5/8 inches to 2 inches for residential and small commercial uses. The muti-jet meter will use with many pipe in internal chamber for against impeller. The impeller rotation speed is in relation to the velocity of water flow. Multi-jets are very accurate at low flow rates, but are not used in larger sizes. Multi-jet meters normally have bronze alloy bodies or outer casings with internal measuring parts made from modern thermoplastics and stainless steel.
2.1 Muti-jet meter
Muti-jet meter are very small size and are commonly used in 5/8 inches to 2 inches for residential and small commercial uses. The muti-jet meter will use with many pipe in internal chamber for against impeller. The impeller rotation speed is in relation to the velocity of water flow. Multi-jets are very accurate at low flow rates, but are not used in larger sizes. Multi-jet meters normally have bronze alloy bodies or outer casings with internal measuring parts made from modern thermoplastics and stainless steel.
3. Electromagnetic meter. 
Magnetic flow meters, commonly referred to as "mag meters" are technically a velocity type water meter, but that they use electromagnetic properties to determine the water flow velocity rather than mechanical. Mag meters require AC or DC electricity to operate the electromagnets. Since mag meters have no mechanical measuring element, they normally have the advantage of being able to measure flow in either direction. Mag meters can also be useful for measuring raw water, and wastewater, since there is no mechanical measuring element to have clogged or debris to damage.
Magnetic flow meters, commonly referred to as "mag meters" are technically a velocity type water meter, but that they use electromagnetic properties to determine the water flow velocity rather than mechanical. Mag meters require AC or DC electricity to operate the electromagnets. Since mag meters have no mechanical measuring element, they normally have the advantage of being able to measure flow in either direction. Mag meters can also be useful for measuring raw water, and wastewater, since there is no mechanical measuring element to have clogged or debris to damage.
typically of measuring
Cubic meter
Cubic meter (symbol m³) is the SI derived unit of volume. It is the volume of a cube with edges one meter in length. In the United States it is spelled "cubic meter."
1 cubic meter is equivalent to:
-1,000 liters ; 1 liter = 0.001 m³
-35.3 cubic feet ; 1 cubic foot (1 ft3)= 0.028 m³
-6.29 oil barrels ; 1 barrel = 0.158 m³
Cubic feet
A cubic foot is U.S. unit of volume. It always used in the United States, Canada and the United Kingdom. It is defined as the volume of a cube with sides of 1 foot (0.3048 m) in length.
1 cubic feet is equivalent to:
-1728 cubic inches
-28.316 liters or 0.028 cubic meters.
-7.480 U.S. liquid gallons
U.S. gallon
US gallon, also known in the United States as English units or standard units, are unit of measurement that are currently used in the United Stated , in some case alongside units form SI (the International System of Units-the modern metric system). All units are defined in term of SI base units, but at ratio in convenient for conversion.
1 US gallon is equivalent to:
-US gallon is defined as 231 cubic inches.
-3.785 liters or about 0.137 cubic feet.
Cubic meter (symbol m³) is the SI derived unit of volume. It is the volume of a cube with edges one meter in length. In the United States it is spelled "cubic meter."
1 cubic meter is equivalent to:
-1,000 liters ; 1 liter = 0.001 m³
-35.3 cubic feet ; 1 cubic foot (1 ft3)= 0.028 m³
-6.29 oil barrels ; 1 barrel = 0.158 m³
Cubic feet
A cubic foot is U.S. unit of volume. It always used in the United States, Canada and the United Kingdom. It is defined as the volume of a cube with sides of 1 foot (0.3048 m) in length.
1 cubic feet is equivalent to:
-1728 cubic inches
-28.316 liters or 0.028 cubic meters.
-7.480 U.S. liquid gallons
U.S. gallon
US gallon, also known in the United States as English units or standard units, are unit of measurement that are currently used in the United Stated , in some case alongside units form SI (the International System of Units-the modern metric system). All units are defined in term of SI base units, but at ratio in convenient for conversion.
1 US gallon is equivalent to:
-US gallon is defined as 231 cubic inches.
-3.785 liters or about 0.137 cubic feet.
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