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Plastic Flow Meter: Low-Cost Variable Area and Turbine Liquid Tools
Quick Answer
Plastic flow meters give you accurate liquid measurement at a fraction of the cost of metal meters. Silver Instruments offers variable area and turbine types with PVC, PP, or PVDF bodies. These are the go-to tools for water treatment, chemical dosing, and irrigation systems where budgets are tight but reliability cannot slip.
Variable area meters, often called rotameters, have a tapered plastic tube and a float. You read the flow directly on the scale printed on the tube. No power supply is needed. Turbine meters use a plastic rotor that spins with the liquid. A sensor picks up the rotation and sends a pulse or 4-20 mA signal. Both are light, easy to install, and resist many mild chemicals.
In practice, a water treatment plant in the Philippines replaced a batch of stainless steel rotameters with PVC variable area meters. The material cost dropped by nearly 45 percent and the installation time halved because the plastic meters weighed much less. The plant measures filtered water and polyaluminium chloride solution at flows between 50 and 500 L/h.
Our plastic variable area flow meters cover pipe sizes from DN10 to DN50. Accuracy typically sits at ±2.5 percent of full scale. They handle pressures up to 10 bar at 20 degrees Celsius. The scale is direct reading in L/h or m3/h. For remote monitoring, we add a 4-20 mA transmitter with two wire loop power.
Turbine plastic flow meters start at DN15 and go up to DN40. These deliver ±1 percent of reading accuracy, which is a step up from variable area types. The output is a frequency signal or a 4-20 mA HART signal. Many engineers choose them for batching and dosing because the pulse output makes totalizing simple. A paint manufacturer in Indonesia uses our PP turbine meter to measure water-based paint additive flow at 30 L/min. The plastic body handles the mild alkaline additive with zero corrosion after two years of operation.
Because the materials are plastic, you need to match the meter body to your fluid. PVC suits clean water, weak acids, and alkalis. PP works with slightly higher temperatures and some solvents. PVDF handles stronger acids and temperatures up to 80 degrees Celsius. Always check your chemical compatibility chart before ordering. If you are unsure, send us your fluid name, concentration, and temperature.
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Send us your pressure in bar, temperature in degree Celsius, pipe size in DN, and flow range. We will reply with a recommended model, a dimensional drawing, and a price quote within one working day. Our team handles inquiries from Southeast Asia, Africa, the Middle East, and Latin America in English, Spanish, Arabic, and Portuguese.
Frequently Asked Questions
Q: What liquids can a plastic flow meter measure?
A: Clean water, mild acids like citric acid, weak alkalis, and many water treatment chemicals. Avoid strong solvents such as acetone and high concentration nitric acid. Check the chemical resistance chart for the specific polymer.
Q: How accurate are plastic variable area meters compared to turbine meters?
A: Variable area meters typically achieve ±2 percent to ±4 percent of full scale. Turbine meters can reach ±1 percent of reading, which is better for low flow rates and batch dosing applications.
Q: Can I use a plastic flow meter for sodium hypochlorite dosing?
A: Yes, PVC or PVDF turbine meters handle sodium hypochlorite at low concentrations used in water disinfection. Keep the concentration below 12 percent and the temperature ambient. We supply complete dosing skid-ready meters with 4-20 mA output.
Q: What pipe sizes are available for these plastic meters?
A: For variable area, we stock DN10, DN15, DN20, DN25, DN32, DN40, and DN50. For turbine types, we offer DN15, DN20, DN25, DN32, and DN40. Flanged ends come as standard on larger sizes. Threaded connections are standard on DN10 to DN25.
Q: How do I clean and maintain a plastic turbine flow meter?
A: Shut off the flow, remove the retaining ring, and pull out the rotor assembly. Rinse it with clean water. Do not use wire brushes. We recommend keeping a spare rotor and bearing kit on hand for critical processes. The rotor replacement takes about five minutes.
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