Rr Flowmeters Private Limited

The roots of thermal flowmeters go back to the hot-wire anemometers that were used for airflow measurement in the early 1900s. Hot- wire anemometers were used in velocity profile and turbulence research. They are very small and fragile and consist of a heated, thin wire element. Hot-wire anemometers have a quick response time, because they are so small and thin. However, their fragility makes them unsuitable for industrial environments. Thermal flowmeters were first introduced for industrial applications in the 1970s.

Full bore Electro Magnetic Flowmeters being the most accurate flowmeters are the most opted flowmeters for conductive liquids.

These are also called as Capacitance Diaphragm Gauge. These small size VG Series Manometers find applications in monitoring Pressures in FPD process, Vacuum heat treatment, injection equipment, degassing equipment, etc.

The story of ultrasonic flowmeters began in 1963, when Tokyo Keiki introduced them in Japan for industrial use. Ultrasonic flowmeters are one of the most interesting types of meters used to measure flow in pipes. The most common variety, transit time, contains both a sending and a receiving transducer. Both sending and receiving transducers are mounted on either side of the flowmeter, or on the pipe wall. The sending transducer sends an ultrasonic signal at an angle from one side of the pipe to the other and back.

Positive displacement flowmeters operate by repeatedly filling and emptying compartments of known volume with liquid or gas from a flowstream. Flowrate is calculated based on the number of times these compartments are filled and emptied. The main types of PD flowmeters used for gas applications are diaphragm and rotary. These types of meters differ according to the way they trap the liquid into compartments with different shapes.

Most Rotameters / variable-area flowmeters consist of a tapered tube containing a float. Fluid passing through the meter exerts an upward force on the float that is counterbalanced by the force of gravity. The point at which the float stays constant indicates the volumetric flow rate, which is often read on a scale on the meter tube. The tubes are made of metal, glass, or plastic.

A water meter is a scientific instrument for accurate measurement of quantity of water distributed to the consumers. It also fulfils the need to know accurately the water produced and distributed. It differs from flow meter in respect of the following points. 1.It is a quantity meter and not a flow rate meter. 2.Water meter is a mechanical device whereas flow meter may be a mechanical or an electronic device. 3.Water meter is always specified in two accuracies i.e. lower range and upper range. Whereas in flowmeters it is specified in a single range. 4.The upper range and lower range accuracies are respectively 2% and 5% of the actual quantity, for the water meter whereas it is variable for flow meter as per the customers requirement. 5.Importance is not given for repeatability and linearity in the case of water meter whereas importance is given in the case of flowmeter. Water meters having sizes from 15 mm to 50 mm as per BIS 779 are considered to be domestic water meters and sizes from 50 mm and above as per BIS 2373 are considered to be Bulk Water Meters. Water meters are classified according to the operating principle, type of end connections, the standard by which the same are covered, constructional features, method of coupling between the counter and primary sensor, the metrological characteristics etc.

Diaphragm meters have several diaphragms that capture the fluid as it passes through the meter. Differential pressure across the meter causes one diaphragm to expand and one to contract. A rotating crank mechanism helps produce a smooth flow of gas through the meter. This mechanism is connected via gearing to the index, which registers the amount of fluid that passes through the meter.