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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