Variable Area Flowmeters

VARIABLE AREA FLOWMETERS

Pure Aqua distributes variable area flowmeters from Blue White Industries that are designed to be highly durable, polished, and with a one piece meter body. These flowmeters are annealed for maximum strength and resistance to harmful chemicals. They are suitable for outdoor installations and exposure to direct sunlight.

Additional features include a comprehensible permanent scale, with a back reflector for simple instructions, and stainless steel coating for resistance against corrosive environments.

F-300 ACRYLIC FLOWMETER

Pipe sizes: 1" - 8"
Flow Rates: 4 to 2,200 GPM

Material: Acrylic
Clamp-On Saddle Mount

FLOWREAD

Pipe sizes: 1½" - 2½"
Flow Rates: 10 to 150 GPM

For use on PVC Pipes
Clamp-On - Insertion Mount

F-400 ACRYLIC FLOWMETER

Pipe sizes: ¼", ⅜" & ½"
Flow Rates: 0.025 to 5 GPM

Accuracy: +/- 5%
For UltraPure Applications

F-410N ACRYLIC FLOWMETER

Pipe sizes: ¾" and 1" NPT
Flow Rates: 5 to 20 GPM

Full Scale Accuracy: +/- 5%
Material: Acrylic

F-420N ACRYLIC FLOWMETER

Connection Sizes: 1"- 1 ½" NPT
Flow Rates: 5 to 50 GPM

Pipe sizes: 1 ½" MNPT
Full Scale Accuracy:+/- 5%

F-430N ACRYLIC FLOWMETER

Pipe sizes: 1 ½" & 2"
Accuracy: +/- 5%

Flow Rates: 4 to 100 GPM
Direct Reading Scale

F-550 ACRYLIC FLOWMETER

Connection Sizes: ¼" - ¾"
Flow Rates: 0.025 - 20 GPM

Accuracy: +/- 5%
Material: Machined Acrylic

F-440 POLYSULFONE MOLDED

Connection Sizes: ⅜" - ¾" NPT
UV Resistant

Flow Rates: .025 to 5 GPM
Compact Size

F-450N POLYSULFONE MOLDED

Connection Sizes: ⅜" - ¾" NPT
Panel Mount, Adjustable

Flow Rates: 0.1 - 10 GPM
Brass Adapters Available

F-451 POLYSULFONE FLOWMETER

F-451 POLYSULFONE FLOW METER

Connection Sizes: 1 - 1-½" FNPT
Flow Rates: 0.5 - 40 GPM

Accuracy: +/- 2%
Material: Polysulfone

F-452N POLYSULFONE MOLDED

Connection Sizes: 2" FNPT
Flow Rates: 2 - 175 GPM

Accuracy: +/- 2%
Material: Polysulfone

F-460 POLYSULFONE MOLDED

For UltraPure Applications
Flow Rates: .1 to 5.0 GPM

Material: Polysulfone
½" - ¾" FNPT/Fusion

F-462 POLYSULFONE MOLDED

Connection Size: 2" FNPT
For UltraPure Applications

Flow Rates: 2 - 80 GPM

F-461 ULTRAPURE

Connection Size: 1" FNPT
Rib Guided Float

Flow Rates: 1 - 35 GPM

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The variable area flow meter is used in industrial applications to monitor vapor flow rates. A funnel and float make up the variable area flow meter. The float's fluctuation to changes in the rate of flow is very straightforward.

Variable area flow meters are also designed to allow for significantly more versatility. There is a fairly large measuring area, plus higher pressure during operation that makes this flow meter desirable. It's easy to set up and manage.

Variable Area Flow Meter: Operational Principles

The variable area approach governs the functioning of the meter: fluid flow lifts a float in a tapered tube, increasing the area available for fluid passage. The float is lifted higher as the flow increases. The flowrate is related to the elevation of the float. The float is increased in liquids by a mixture of the liquid's buoyancy and the fluid's velocity head. With gases, buoyancy is almost non-existent, and the float reacts solely to the velocity head. The fluid flowrate and the annular area between the float and the tube wall determine how far the float goes up or down in the tube.

This equilibrium of pressure is thrown off by a change in the rate of flow. The float then changes direction until it gets to a point in which the conditions are balanced once more. For each steady flowrate, the variable area flow meter float adopts an unique place to fulfill the power formula. Variable area flow meter, on the other hand, must be vertically orientated and installed because the float position is gravity dependant.