New delhi-based rockwin flowmeter india pvt ltd manufactures dresser rotary flow meters, which work based on positive displacement principle. These are designed to offer accurate measurement of gas over widely fluctuating flow, pressure and temperature conditions. These are available in mechanical counter, optional pulse output or integral volume corrector versions. Applications include custody transfer, compressor fuel gas and industrial fuel gas measurement. Specifications of this type of meters are: sizes: 50 to 200 mm nominal bore; flow range: 0.08 to 1,600 m3/h; accuracy: [ 1 percent of the reading; and rangeability: 26:1 or better.
