Flowmeters, Insertion flow meters
Municipal WaterIndustry: Municipal Water Market
SIC Code: 91 11
Application: A major U.S. City located in the Midwest is using bidirectional turbine flowmeters from HFC for inventory control. This municipality covers a wide geographic region that includes a number of counties, reservoirs and pump stations. The bi-directional turbine flowmeters allow them to monitor inventory and move water as necessary within the user system depending upon demand.
• Flowmeters were for use in 62″, 60″, and 36″ lines.
• Needed to be bi-directional.
• Needed to provide a “split” 4-20 mA output signal with 12 to 4 mA representing reverse flow and 12 to 20 mA
representing forward flow (this was a requirement of their DCS system).
• Flowmeter portion of system had to be capable of immersion in a flooded pit (electronics to be located remote).
• Output from flowmeter was required to transmit over 500′ without any signal conditioning.
Solution: Bi-directional, adjustable insertion turbine flowmeters from the HP Series were provided. Meters included 2″ rotors in order to obtain repeatable flow rates as low as .25 FPS. Flowmeters were equipped with two magnetic pick up coils located at 90 electrical degrees from one another. These outputs were sent to a remote Flowstar Model 2000 which included the quadrature bi-directional detection feature and a split 4-20 mA signal representing both forward and reverse flow rate.
Hoffer Advantage: This customer originally considered two back-to-back Annubar flowmeters for forward and reverse flow measurement on each line. In conjunction with the two flowmeters, they would require a flow switch to detect flow direction. This approach was significantly more costly and complex than the turbine flowmeter system.
• A single flowmeter was usable for bi-directional flow measurement.
• Flowstar flow computer provided a split 4-20 mA signal representing both forward and reverse flow rate.
• Flowstar could provide linearization over the wide repeatable flow range provided by the insertion meter. This was critical because flow rates were low relative to the line size.
• Flowmeter must be water tight since meters will be installed in a pit which may flood.
Summary: The HP Series bi-directional insertion flowmeters allow the user to obtain economical flow rate/flow total information. This, in turn, enables the water utility to manage the potable water throughout the system. Flowmeters supplied are adjustable type and are installed through an isolation valve to allow user to service the flowmeters when necessary.
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