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500 ml/min Flow Meter for Hydraulic System Balancing
Quick Answer: A 500 ml/min flow meter is the right sensor to balance small hydraulic circuits, pilot lines, and lubrication branches on a test bench. Silver Instruments supplies oval gear, micro turbine, and Coriolis meters with 4-20 mA HART that cover this low flow reliably. Send us your oil viscosity, pipe size (DN), and pressure for a specific quote and delivery timeline.
Why 500 ml/min Matters on a Hydraulic Test Bench
On a closed-loop system with six hydraulic motors, a flow mismatch of only 80 ml/min between two branches makes one motor drag and overheat. Excavator rebuild centers and injection molding machine service shops in Southeast Asia run low-flow balancing tests before shipping a unit back to the field. They need a flow meter that reads accurately from 300 ml/min up to maybe 2 L/min. A generic DN15 turbine meter has a minimum of 2 L/min and simply stops measuring below that. A dedicated 500 ml/min meter fills this gap.
Flow Meter Types That Handle 500 ml/min for Hydraulic Oil
We see three sensor families work well in this range.
Micro turbine meters with DN4 or DN6. Our HM-04M meter measures 0.02 to 2 L/min for oil up to 50 cSt. It gives a frequency pulse and an optional 4-20 mA. A hydraulic repair workshop in Indonesia installed six HM-04M meters on a manifold to balance a six-section gear pump test stand. The technician adjusts each restrictor until all displays read 500 ml/min. No more guesswork.
Oval gear meters for higher viscosity. When the oil is thicker than 50 cSt, oval gear meters hold accuracy almost independent of viscosity. Our OG-DN4 meter spans 0.05 to 3 L/min with a repeatability of 0.1 percent. A paint manufacturer in Thailand uses an oval gear meter to verify flushing oil at exactly 500 ml/min through a hot oil heat exchanger. Because the oval gear is positive displacement, you get a rock-steady 4-20 mA even at a trickle flow.
Micro Coriolis mass meters. If your test stand needs mass flow in g/min and fluid density, a micro Coriolis meter works from 0 to 10 kg/h. For ISO VG 32 oil, 500 ml/min equals about 430 g/min. The price is higher, but a university hydraulics lab in Qatar selected this option because it passed their ISO repeatability audit on the first try.
Real-World Hydraulic System Balancing Setup
Here is a typical scene. A power pack drives four proportional valves. The technician puts one flow meter in series right after each valve, before the motor. He reads four values on a loop-powered indicator or a PLC screen. He tweaks the spool trims until all four branches settle at 500 ml/min with less than 2 percent deviation. In practice, meters with a local LCD save a lot of walking back and forth. Last year a Vietnam-based customer ordered eight HM-04M units with G1/8 threads and IP67 for this exact setup. Balancing time dropped from two hours to twenty-five minutes.
Common Pitfalls When Measuring 500 ml/min
Air is the number
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Quick Specs and How to Order
We keep small turbine and oval gear meters rated from 0.02 to 3 L/min in stock. Wetted materials are 316L stainless steel or anodized aluminum. Process connections available in G1/8, G1/4, 1/4 NPT, and DN4 flange. Output choices include open collector pulse, passive 4-20 mA, RS485 Modbus, and HART. Fluid temperature up to 120 °C on standard models; pressure rating to 200 bar on the turbine version. We ship within 7 working days to Kuala Lumpur, Dubai, Johannesburg, or São Paulo.
To receive a quote, send us five details: fluid type and viscosity, operating pressure, temperature, pipe diameter, and your required flow range. We will respond with a ready-to-ship model or a short lead-time build within one working day. See our selection of oval gear flow meters for viscous oil and micro turbine flow meters under 2 L/min on the Silver Automation Instruments website.
FAQ
What kind of flow meter can measure 500 ml/min of hydraulic oil? A DN4 micro turbine meter with a 0.02-2 L/min range works for oil up to 50 cSt. For thicker oil, choose a positive displacement oval gear meter with the same line size.
Can a paddle wheel flow meter handle 500 ml/min? No. Paddle wheel meters need a minimum velocity that typically translates to 2 L/min or more in small pipes. They are not reliable at 500 ml/min and we do not recommend them for hydraulic balancing.
How should I plumb the meter for a multi-branch balancing job? Place one meter in each branch downstream of the directional valve and upstream of the motor or cylinder. Keep hoses short, avoid tight bends, and bleed all air thoroughly before starting your measurement.
Which output is better for data logging: pulse or 4-20 mA? If you display flow on a panel meter or log on a PLC, 4-20 mA with HART is easier to scale. If you need to count total volume over a cycle, pulse output works best. Many customers request a dual-output meter with both signals.
What is the price of a 500 ml/min flow meter and how fast can it reach Nigeria or Mexico? A basic DN4 turbine meter with pulse output costs between USD 320 and 480 depending on pressure rating. An oval gear version starts around USD 420. We ship via DHL Express, and delivery to Lagos or Mexico City typically takes 5 to 7 working days after calibration.
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