Mechanical flowmeter family for water service
Omega introduces FTB8000HW Series, able to tolerate low-quality and hot water.
Omega has introduced its FTB8000HW series of hot-water meters. This series features flow rates from .22 to 132 gpm, with 150 psi maximum operating pressure and 90 °C (194 °F) maximum operating temperature. Units in the series use the multi-jet principle, which has been a widely accepted standard for many years. This type of meter mechanism is known for its wide range, simplicity, and accuracy in low-quality water. The impeller is centered in a ring of jets, with inlet on one level and outlet on another. A gear train drives the register totalizer dials. For pulse output, one of the dials is replaced by a gear, which turns a magnet that is detected by an encapsulated sensor threaded into the outside of the lens. Pulse rate is determined by the gear and the dial on which the gear is placed. Changing the pulse rate requires no special tools and can be done in the field.
Mechanically, all FTB8000HW meters are the same. The difference between the -PR, -PT, and standard models is in the sensor. -PR model meters use a solid state, Hall-effect sensor, which requires power. -PT model meters use a 2-wire reed switch which provides a dry-contact closure and does not require power. Basic meters totalize only and do not have a rate output.
Edited by Peter Welander, pwelander(at)cfemedia.com
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