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1/2 Inch Lubricating Oil Flow Meter for Small Flow Lines
Quick Answer: For 1/2 inch lubricating oil lines, an oval gear flow meter delivers stable, repeatable readings even with oil viscosity above 100 cP. Silver Automation Instruments supplies a DN15 oval gear meter with 4-20 mA HART, pulse, or Modbus output. Send us your oil type, viscosity, pressure, and flow range to get the right model.
Lubricating oil measurement in 1/2 inch pipes is common. You find it in compressor lube oil circuits, engine test stands, hydraulic test rigs, and oil blending skids. Many plants in Southeast Asia, the Middle East, and Africa run these small lines to monitor additive injection or bearing oil feed. Standard turbine flow meters struggle with sticky, viscous oil. Here is the thing. In small DN15 pipes, even a slight viscosity change throws off a turbine meter K‑factor. So most engineers skip turbines for lube oil and pick a positive displacement meter instead.
Silver Automation Instruments offers an oval gear flow meter specifically for 1/2 inch lines. The body is stainless steel 316L. Working temperature goes from minus 20 °C up to 180 °C. It handles oil viscosity up to 2000 cP. At a customer site in Vietnam, a set of these meters monitors SAE 40 oil flow into six bearing housings. Each meter sends a 4-20 mA HART signal back to a PLC. Accuracy stays within ±0.5% of reading down to very low flow rates of 2 L/h. Because the oval gears rotate only when oil moves, there is no bypass or slippage at low flow.
Output options include open collector pulse, NPN pulse, and 4-20 mA with HART. An optional local display shows both instantaneous flow rate in kg/h or L/min and totalized volume in liters. For installations in Zone 1 or Zone 2 hazardous areas, we can supply the same DN15 meter with ATEX and IECEx certification. No need to add an expensive external barrier if you pick the intrinsically safe version.
In practice, one question comes up often. Will the oval gear meter create a large pressure drop? In a 1/2 inch line, our meter’s pressure loss is typically under 0.3 bar at 10 L/min of ISO VG 68 oil. That is low enough f
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Last year a customer in Malaysia replaced an imported turbine meter with our DN15 oval gear model. The turbine meter gave erratic readings after six months because some polymer additives in the oil increased viscosity. The oval gear meter solved the problem. That customer now orders three to four units per year for their skid builder projects.
FAQ
What is the best flow meter for 1/2 inch lubricating oil lines?
A positive displacement meter, especially an oval gear type, handles viscous oil better than a turbine or Coriolis at very small flow rates. Silver Automation Instruments’ DN15 oval gear meter works well with SAE 10 to SAE 140 oil, synthetic lubes, and even grease.
Can your oval gear flow meter handle high viscosity lube oil?
Yes. The standard model covers 1 to 2000 cP. For oil above 2000 cP, we reduce the standard flow range and use larger gear clearances. Tell us your viscosity and operating temperature and we will tune the meter.
What output signals does your 1/2 inch lube oil flow meter offer?
You can choose open collector pulse, NPN/PNP pulse, 4-20 mA, or 4-20 mA with HART. Modbus RTU is also available. All signals are compatible with a typical PLC analog input or digital counter card.
What is the accuracy of Silver Instruments oil flow meters?
Our small oval gear meters give ±0.5% of reading from 5% to 100% of maximum flow. For special calibration at very low flows, we can achieve ±0.2% inside a limited range. Repeatability is ±0.05%.
How do I order a 1/2 inch lubricating oil flow meter?
Send us your pressure (bar), temperature (°C), pipe size (DN), oil viscosity (cP), and flow range (min and max L/h or kg/h). Also mention any hazardous area requirement. We will reply within 12 hours with a datasheet, price, and delivery time. Email us at [email protected] or reach us via our website.
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