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Acrylic Flow Meter: Clear Body Tapered Visual Fluid Measuring Tubes
Quick Answer: An acrylic flow meter is a variable area flow meter with a transparent tapered tube. The float position gives a direct visual flow reading for water, air, nitrogen, and other compatible fluids. Silver Automation Instruments supplies these meters in DN15 to DN50 sizes for low pressure and low temperature lines.
What Is an Acrylic Flow Meter
An acrylic flow meter has a clear PMMA body with a tapered bore. A float sits inside the tube. The fluid enters from the bottom and pushes the float upward. The higher the flow, the higher the float position. The operator reads the flow against a printed scale on the tube. Because the body is transparent, no external display or power supply is needed. This clear body tapered visual fluid measuring tube design is common for local indication and simple flow checks.
Where These Meters Work Well
You can use an acrylic flow meter on clean water, deionized water, air, nitrogen, oxygen, carbon dioxide, and mild chemical solutions. We have seen these meters in water treatment plants in Vietnam, laboratory gas supply panels in Australia, and aquafeed dosing lines in Thailand. A paint manufacturer in Malaysia installed a DN15 acrylic flow meter on a cooling water discharge line for local flow checks. The installation took less than one hour because the meter used BSPT threads and no wiring. The meter is not suitable for strong acids, strong bases, many solvents, steam, or fluids above 60 degrees Celsius. Acrylic can crack under impact and can be damaged by organic solvents.
Typical Specifications
Standard sizes are DN15, DN20, DN25, DN32, DN40, and DN50. End connections are usually BSPT, NPT, or socket union. The standard body is PMMA acrylic. O-rings can be EPDM or Viton depending on the fluid. Accuracy is around ±4% of full scale. The pressure limit is 10 bar at 20 degrees Celsius for most sizes. The temperature limit is 60 degrees Celsius. Flow ranges depend on fluid, density, and viscosity. For example, a DN20 water meter may cover 100 to 1000 L/h. A DN25 air meter may cover 0.5 to 5 Nm3/h. If your liquid viscosity is above 50 cP, size the meter carefully because viscous fluids change the float position and reduce accuracy. For a DN20 water line from 100 to 1000 L/h, the Silver Instruments SAAC DN20 acrylic flow meter fits directly.
Installation Points
Mount the meter vertically with the inlet at the bottom and the flow arrow pointing upward. Use pipe supports to avoid bending stress on the acrylic threads. Do not over tighten plastic threads. If the line vibrates, add a support bracket. Install a bypass line if the process cannot stop for cleaning. For gas flow, the scale must be corrected to actual line pressure. A meter calibrat
Common Problems We See
Acrylic tube cracking is the most common failure. The cause is usually over tightening of the connection or impact from a tool. Another problem is scaling on the float and tube in hard water. The float may stick and the reading becomes unreliable. In cooling water with high hardness, schedule cleaning every three to six months. For algae growth in clear water lines exposed to sunlight, use a covered installation or clean the tube regularly. We have seen this in outdoor fish farms in Indonesia. A simple opaque cover reduced buildup and cut maintenance time.
How to Get a Quote from Silver Instruments
Send us your fluid type, flow range in L/h or m3/h, pipe size DN, connection type, pressure in bar, and temperature in degrees Celsius. If you have a photo of the existing meter, attach it to the request. For gas applications, provide operating pressure and standard conditions. Silver Automation Instruments is the manufacturer and supplier for these acrylic rotameters. We will recommend a Silver Instruments SAAC acrylic flow meter or another technology if the process is outside acrylic limits. We will reply with price and lead time for your selected size. Silver Automation Instruments supplies flow meters to customers in Southeast Asia, Oceania, Latin America, Africa, and the Middle East. Tel: +86-135-1213-1526. WhatsApp: 86-135-12131526. WeChat: +86 13512131526.
FAQ
Can an acrylic flow meter work on hot water? No. The standard acrylic tube is rated for 0 to 60 degrees Celsius. For hot water above 60 degrees Celsius use a metal tube variable area meter or an electromagnetic flow meter.
Is an acrylic flow meter accurate enough for batching? It depends on the batch tolerance. With ±4% of full scale, it fits simple local indication and non-critical dosing. For high accuracy batching use a Coriolis mass flow meter or an electromagnetic flow meter.
What is the maximum pressure? Usually 10 bar at 20 degrees Celsius for DN15 to DN50 acrylic body meters. At higher temperature the pressure limit drops. Do not use with steam.
Does the meter need a power supply or transmitter? No. The meter works on direct visual movement of the float. You can add a limit switch or a transmitter for remote indication, but the basic model needs no power supply.
How do I order a replacement acrylic tube? Send the meter serial number, tube length in millimeters, end fitting type, and flow range. A replacement tube from Silver Instruments can be ordered without buying a full meter. Include photos if you are not sure.
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