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Acrylic Air Flow Meter: Low-Cost Block Variable Area Visual Rotameters
Quick Answer: An acrylic air flow meter is a low cost variable area rotameter with a clear acrylic block body. It gives a direct visual air or gas flow reading without power, wiring, or a transmitter. For a fast quotation, send pipe size (DN), flow range, pressure (bar), temperature (°C), and gas type.
What Is an Acrylic Air Flow Meter?
This instrument uses a tapered bore inside a solid acrylic block and a float that moves upward with flow. Air enters from the bottom and exits at the top. The operator reads flow from the top edge of the float against a printed scale. Silver Instruments supplies these meters in DN15, DN20, DN25, DN32, DN40, and DN50 line sizes. The standard body is clear acrylic, the float is 316L stainless steel or PTFE, and the fittings can be brass, PVDF, or stainless steel.
How the Variable Area Rotameter Works
In a variable area flow meter, the annular gap between the float and the tapered bore changes as the float rises. Flow rate determines the float position. Drag force, buoyancy, and gravity reach balance at a stable height. The scale is usually calibrated for air at 20 °C and 1.013 bar absolute. For compressed air at 6 bar or 8 bar, a correction factor is required. In practice, most engineers skip the pressure correction part. Then they ask why the reading does not match the compressor nameplate. The answer is usually pressure and temperature correction.
Low Cost Block Construction and Pressure Limits
The block design is stronger than thin wall tube rotameters. Standard acrylic air flow meters handle 0 to 60 °C and up to 10 bar for small sizes. Larger sizes may have lower pressure limits. Use these meters for air, nitrogen, argon, or low moisture gases. Do not use them with strong ammonia, ozone, ketones, or solvent vapors because acrylic can craze. We have seen this on customer sites many times. A stainless steel body rotameter is the safer choice for aggressive gas.
Typical Flow Ranges and Accuracy
Accuracy is about ±4 percent of full scale. Turndown is normally 10 to 1. A DN15 meter may cover 0.5 to 5 L/min or 2 to 20 L/min. A DN25 meter may cover 20 to 200 L/min. A DN50 meter may cover 2 to 20 m3/h for air at standard conditions. Scales can be printed in L/min, m3/h, scfh, or Nm3/h. Tell us the actual working pressure and temperature so we can correct the scale for your process.
Common Applications
Silver Instruments has supplied acrylic air flow meters to a paint manufacturer in Vietnam for compressed air lines, a water treatm
Installation and Maintenance Notes
Install the meter vertically with flow from bottom to top. Keep at least 10 pipe diameters of straight run upstream and 5 downstream if possible. Avoid mounting the meter next to a fast opening solenoid valve or a reciprocating compressor without pulsation dampening. The float can bounce and give a poor reading. Clean the acrylic bore with mild soap and warm water. Do not use abrasive pads or solvent based cleaners.
Options and Electrical Output
A basic acrylic rotameter has no electrical output. If you need remote monitoring, ask for a magnetically coupled pointer with a 4-20 mA transmitter or two wire limit switches. These options add cost but keep the local visual reading. Some customers add a needle valve for manual flow control on purge lines, laboratory benches, and gas sampling panels.
How to Request a Quote from Silver Instruments
You can contact Silver Automation Instruments by Tel: +86-135-1213-1526, WhatsApp: 86-135-12131526, or WeChat: +86 13512131526. Website: flow-meter.com.au. Send us the gas type, minimum and maximum flow rate, pipe size (DN), connection type, working pressure, and temperature. If the gas is compressed air, state the pressure in bar. We will return a model, scale range, price, and estimated delivery time.
FAQ
What is the maximum pressure for an acrylic air flow meter?
Small DN15 to DN25 meters can handle up to 10 bar at ambient temperature. Larger sizes may have lower pressure ratings. Confirm with our engineers before final selection.
Can this meter measure oxygen?
Yes, clean dry gases including oxygen can be measured. For oxygen service, specify no oil or grease assembly.
What accuracy can I expect?
About ±4 percent of full scale. Accuracy depends on stable pressure and temperature, correct installation, and a clean float.
Does the meter need power or wiring?
No. The standard acrylic air flow meter gives a direct visual reading without power. Only versions with a transmitter or switch need wiring.
What is the typical delivery time?
Small DN15 to DN25 meters often ship in 5 to 10 working days. Special scale ranges or larger DN40 and DN50 sizes may take 3 to 4 weeks.
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