Kobold Instruments Inc.

Feb. 9, 2007
System pressure fluctuations don't faze Kobold differential pressure flowmeter's accuracy

The RCD series differential pressure flowmeter from Kobold measures flows of liquids and compressed gases using the orifice principle. The orifice, located in the flow body, generates a differential pressure which varies with flowrate. The differential pressure is applied to a measuring bellows. The measuring bellows is linked either to a mechanical indicator, or to a hall effect sensor, which is input to a compact or full featured electronic display and controller.

The design features a single measuring bellows making its accuracy unaffected by system pressure fluctuations. All versions are manufactured with a measuring bellows made of 316-Ti stainless steel, making the bellows extremely strong and resistant to wear. The meter movement is a single fulcrum lever design, which is simple, yet very reliable with a minimum of wear parts. The RCD is available with bronze or stainless steel bodies ranging in size from 1/2 in NPT to 3 in NPT. The various electronic display and control units offer a variety of options such as digital or bargraph displays, adjustable switches and flow transmitters.