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1/2 Inch Oval Gear Flow Meter for Coolant and Lubrication Oil
Quick Answer
A 1/2 inch oval gear flow meter is ideal for tracking coolant and lubrication oil flows on CNC lathes, milling machines, and grinding centers. Silver Automation Instruments offers the OG-1/2-GA with 4-20 mA HART and pulse outputs, handling 0.5 to 120 L/h and oil viscosity up to 1000 cP. Accuracy stays within ±0.5% even with thin cutting oils down to 2 cSt. Send us your flow range, pressure, temperature, and viscosity to get a direct price quote.
Most machine shops in Vietnam, Thailand, and Mexico face a common headache. They need to know how much cutting oil or way lube each CNC consumes per shift. A simple flow meter on the coolant line can cut waste and prevent tool wear. But not every meter holds up with sticky oil and coolant that carries swarf particles. This is where the oval gear design wins.
Why an Oval Gear Meter for Machine Tool Oil
Here is the thing: a gear flow meter measures volume directly. Two oval rotors mesh inside a precision chamber. Each rotation pushes a fixed volume from inlet to outlet. This positive displacement principle ignores temperature swings and viscosity shifts. In practice, a 1/2 inch oval gear meter measures ISO VG 46 way lube just as accurately as it measures water-soluble coolant at 1 cSt. Turbine meters drift. Ultrasonic meters struggle with low conductivity coolant. The oval gear keeps reading true.
We have seen a job shop in Indonesia cut tool replacement cost by 35% after installing our OG meters on each way lube line. They realized some lubrication points were getting only half the required oil. The data came straight from the 4-20 mA signal into their PLC. No guesswork at all.
Specification Details for the OG-1/2-GA
The housing is 316L stainless steel with PPS rotors. Line size is DN15 (1/2 inch) with NPT or BSP threads. Flow range covers 0.5 to 120 litres per hour. Field accuracy is ±0.5% of reading across a 10:1 turndown. Repeatability hits ±0.03%. Output choices include two-channel open collector pulse, Namur sensor for ATEX Zone 1, and 4-20 mA HART. The meter handles fluid temperature from -40 to 120 °C and pressure up to 64 bar. Inline viscosity range is 2 to 3000 cP. An optional integrated PT100 RTD can monitor oil temperature, letting you track heat load on the spindle. For straight cutting oil at 100 cP, pressure drop stays under 0.2 bar at max flow.
One detail most engineers skip: the filter. Coolant often carries chips and sludge. Place a 100-mesh Y strainer right upstream. Without a filter, solid particles can jam the rotors. Silver Instruments ships each meter with a strainer recommendation sheet and a quick-start guide.
Installation Tips for Lubrication Skids
Mount the meter with the rotors in a horizontal plane. Avoid vertical rotor axis orientation because air pockets can cause under-registration. Always fill the meter with liquid before startup. In a lubricati
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For coolant metering on a 24/7 production line, we recommend pairing the OG-1/2-GA with a local display such as the Silver Instruments SI-R100 paperless recorder. Operators can see flow data without opening the control panel.
Customer Use Cases
A CNC turning center builder in São Paulo integrates our 1/2 inch oval gear meter into a coolant monitoring skid. They ship 400 units a year. The meter sends pulse signals to a Siemens PLC to track cutting oil consumption per part. The owner once told us that the meter pays for itself in three months just by spotting leaky solenoid valves.
Another plant in South Africa uses the OG-1/2-GA on a central lubrication system for a grinder. With oil viscosity around 150 cP at 30 °C, the meter runs with less than 0.1% drift over 12 months. They send us the annual calibration report for confirmation.
FAQ
Q: Can the 1/2 inch gear flow meter handle water-glycol coolants?
Yes. The PPS rotors and stainless body are fully compatible with water-glycol fluids up to 90 °C. The meter does not corrode nor swell. Just verify that conductivity is not needed because this is not a magnetic flow meter.
Q: What is the minimum measurable flow for way lube?
The meter detects flow as low as 0.3 L/h with a consistent pulse output. For way lube systems that operate at 0.5 L/h, the repeatability is good enough to detect a blocked metering unit.
Q: Do I need a special power supply?
The 4-20 mA loop can be powered by 24 V DC from the machine PLC. Pulse outputs need a 5-30 V DC pull-up. More details are on the Silver Instruments wiring diagram.
Q: How often should I recalibrate the meter for coolant service?
With clean oil, once a year is enough. In coolant with fine swarf, inspect the rotors every 6 months. If you see a shift larger than 1%, contact us for a service kit. We ship replacement rotor sets worldwide.
Q: Can I get an ATEX-certified version for a paint shop?
Yes, we offer the OG-1/2-GA with an ATEX Zone 1 Namur sensor. Use it for solvent-based lube in explosive atmospheres. Provide your zone classification and gas group when requesting a quote.
How to Order and Get a Quote
Send us your required flow range (L/h or L/min), fluid type and viscosity (cP or cSt), operating pressure (bar), temperature (°C), pipe thread (NPT or BSP), and output signal preference. Email [email protected] or check the product configurator at flow-meter.com.au. Mention the keyword "OG-1/2-GA coolant meter" and the sales team will return a price in less than 8 working hours.
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