hydraulic oil flow meter 2 inch

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Silver Instruments 2-Inch Hydraulic Oil Flow Meter: Direct Selection and On-Site Tips

Quick Answer: For a 2-inch hydraulic oil line, a positive displacement oval gear flow meter usually gives the most reliable readings. Silver Instruments supplies a DN50 oval gear meter that handles up to 420 bar, oil viscosity from 2 to 1000 cP, and delivers a 4-20 mA HART output directly to a PLC. You can have one ready to ship from our warehouse within 5 working days if we know your flow range and oil temperature.

Why a 2-inch Line Demands the Right Meter

Many hydraulic power units, test benches, and lube oil skids run a 2-inch (DN50) main line. Hydraulic oil at this size is not just a thin fluid. Viscosity can be anywhere from 10 cP at high temperature to above 300 cP during cold starts. A meter that works well for water often drifts or clogs when you put ISO VG 46 or VG 68 oil through it.

We have replaced turbine meters on 2-inch lines more times than we can count. In practice, the turbine’s bearing drag changes with oil viscosity. The K-factor shifts. You end up with a 3% error that nobody catches until a batch of cylinders fails a leak test. That is why we stock a dedicated DN50 oval gear flow meter for hydraulic oil.

Which Silver Instruments Meter Fits a 2-Inch Hydraulic Line

Our model SIOG-50 is a cast steel oval gear flow meter with a 2-inch flanged connection. Face-to-face length is 235 mm, matching most DIN or ANSI flanges. Here are the parameters engineers actually ask for:

The flow range spans 8 to 250 L/min. Maximum working pressure is 420 bar at ambient temperature. Wetted parts are hardened steel gears with PEEK bearings. The meter ships with a standard PT100 temperature sensor embedded in the body. The electronic transmitter gives both a 4-20 mA HART signal and an active pulse output. You can wire it to a PLC, a panel display, or our paperless recorder.

For hazardous areas, we supply an ATEX Zone 1 and Zone 2 certified version. The Ex marking is II 2G Ex db IIC T6. Many oil and gas service packs in the Middle East order this exact configuration because the skid builder needs to meter hydraulic power unit oil consumption without an additional purge system.

Installation Tips Engineers Often Skip

A 2-inch oval gear meter is not picky about straight pipe. You can put an elbow right next to it. But one thing will destroy accuracy fast: air bubbles. Hydraulic oil entrains air easily after the pump. Install a simple air release valve 20 cm upstream. Place a 100-mesh Y-type strainer before the meter. We have seen a single steel chip from a new hose jam a gear set on a customer site in Indonesia. The repair cost more than the meter itself.

Mount the meter horizontally with the electronics box facing upward. The oil flow should go into the bottom port and out the top. This keeps the measuring chamber full and avoids dry running du

ring startup. If your system has a 2-inch pipe but the flow rate sometimes dips below 5 L/min, talk to us. We will reduce the rotor clearance at the factory so the meter can still resolve low flow without internal leakage.

A Floor Test That Paid for the Meter in One Week

Last year a hydraulic manifold builder in Vietnam asked for a quick delivery. They test each assembled block with ISO VG 32 oil at 210 bar. Their old paddle wheel meter showed 65 L/min while the real flow was 71 L/min. That 10% gap meant some blocks passed the pressure test but failed in the field. We shipped a SIOG-50 oval gear meter with an onboard totalizer. They installed it on the main return line before the cooler. After one week, the reject rate dropped from 6% to zero. The meter paid for itself in five working days. Now they order two units every quarter.

FAQ for 2-Inch Hydraulic Oil Flow Meter Applications

Can I use a Coriolis meter on a 2-inch hydraulic line?
Yes, but a Coriolis meter in DN50 will cost 3 to 5 times more than an oval gear meter. And it does not like pulsating flow. Most hydraulic test benches run a piston pump that creates strong pulses. Our oval gear meter damps them mechanically and still holds 0.5% accuracy.

What happens if the oil temperature exceeds 80°C?
The standard meter works up to 120°C. The PT100 inside the transmitter compensates viscosity-related error. You get a corrected 4-20 mA output. For temperatures above 150°C, we add a high-temperature FKM seal and ceramic bearings. Mention your max oil temperature when asking for a quote.

Does the meter need an external power supply?
The 4-20 mA HART version needs a 24 V DC loop. The pulse version is passive and does not need external power. Some customers in Africa use the pulse output to drive a local electromechanical counter without any wiring hassle.

How do I prevent meter damage during system flushing?
Remove the meter or bypass it during high-velocity flushing. Flushing loops often run 3 to 5 m/s, far above the meter’s design limit. We can supply a temporary spool piece with the same flange dimensions so your crew can install it and spare the internals.

What is the typical lead time for a DN50 oval gear meter?
Stock items ship in 3 to 5 working days from our warehouse. Custom options like ATEX certification or high-temperature seals add 2 to 3 weeks. We use DHL or FedEx for most destinations in Southeast Asia, Oceania, Latin America, and the Middle East.

Send us your operating pressure in bar, oil temperature in °C, pipe size (DN), and expected flow range. We will return a complete data sheet, pricing, and delivery time to your inbox, usually within the same working day. Reach the Silver Instruments sales team directly at [email protected].