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Blue White Flow Meters: F-300 Impact-Resistant Acrylic Pipe Flow Indicators for Dosing and Water Treatment
Quick Answer: The Blue White F-300 is a direct reading acrylic variable area flow meter for water, chemicals, and light slurries. It shows flow visually without power or wiring. Common ranges span 0.025 to 5 GPM. Silver Automation Instruments can quote this flow indicator or recommend an alternative if you send your pipe size, liquid, pressure, and flow range.
What Is the Blue White F-300 Flow Indicator?
The F-300 is a machined acrylic flow meter body made by Blue White Industries. It is a variable area flow meter. A float inside the tapered bore rises as flow increases. You read the flow rate on the scale printed on the acrylic block.
The thick acrylic body tolerates impact, vibration, and rough handling better than many glass tube rotameters. Plant operators in Southeast Asia and the Middle East often prefer this design for small dosing lines. The body is clear enough to see the float from a distance. That helps in tight skid compartments.
Key Specifications of the F-300 Acrylic Flow Meter
These are the numbers we ask for on most inquiries.
- Body material: clear machined acrylic
- Connection sizes: 1/4 inch, 1/2 inch, 3/4 inch, or 1 inch NPT
- Common flow ranges: 0.025 to 5 GPM depending on model
- Pressure limit: 150 psi at 21 °C
- Temperature limit: 66 °C for acrylic
- Accuracy: plus or minus 5 percent of full scale
- Fittings: PVC, polypropylene, or stainless steel options
Check the exact scale before you buy. The same body size can have different float materials and ranges. A customer in Vietnam ordered the wrong range for an alum dosing line last year. We now ask for the liquid, the target flow, and the minimum flow before quoting.
Common Applications We See
In practice, this flow indicator appears in dosing panels, reverse osmosis systems, cooling towers, and boiler feed water lines. A water treatment contractor in Indonesia used F-300 units on sodium hypochlorite injection skids. He needed a clear visual readout at low flow around 5 liters per hour. The acrylic body handled the chemical splash area without cracking.
Food and beverage plants also use these meters on clean water and CIP chemical return lines. But we always tell customers to check chemical compatibility with acrylic before purchase. We have seen this on customer sites many times in Vietnam and the Philippines. The most common mistake is using a body rated for water with a solvent based chemical. Some solvents and strong acids can cloud or damage the body. If the liquid is aggressive, choose a PTFE or stainless steel meter instead.
Installation and Pressure Notes
Mount the F-300 vertically with flow moving upward. The float will not read correctly if you install it horizontally or upside down. Use pipe unions or adapters for cleaning. Avoid overtightening the plastic threads. A cracked body from a wrench is not covered under warranty in most cases.
The pressure limit drops as temperature rises. For hot water above 49 °C, reduce the pressure or choose a metal tube flow meter. Do not use an acrylic body for steam, strong solvents, or liquids above the rated temperature.
F-300 vs Other Flow Meter Technologies
The F-300 is a local indicator only. It does not send a 4-20 mA HART signal or a pulse output. If you need remote monitoring or data logging, this device will not work alone. Many engineers pair a visual indicator with a transmitter style meter. Others choose an electromagnetic flow meter or oval gear meter when electronic output is required.
Silver Automation Instruments supplies electromagnetic, oval gear, thermal mass, and Coriolis flow meters for applications that need signal output. But for simple