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Silver Instruments Hydraulic Oil Flow Meter DN80: Direct Purchase Guide for Engineers
Quick Answer: For a DN80 hydraulic oil line, the best meter choice depends on your oil viscosity, flow rate, and whether you need batching or just monitoring. Most engineers in Southeast Asia and the Middle East choose an oval gear flow meter for high accuracy at low flows, or an electromagnetic flow meter if water contamination makes the oil conductive. Send us your flow range in L/min, oil type, and pressure, and we reply with a DN80 meter quote within 2 hours.
Here is the thing. Hydraulic oil is expensive. Leakage or inaccurate measurement in a DN80 line costs real money fast. A plastic injection plant in Thailand recently told us they were losing 3% of their hydraulic oil inventory every quarter. They used a turbine meter before. Turbine meters drift when oil viscosity changes with temperature. We replaced it with an oval gear meter with a pulse output. The loss dropped to zero.
Why DN80 Is a Tricky Size for Hydraulic Oil
DN80 is not small. It is the transition point. Pipes smaller than DN80 use positive displacement meters easily. Pipes larger than DN80 often switch to turbine or Coriolis. But at DN80, you have real options. You can use an oval gear flow meter, a turbine meter, or even an electromagnetic flow meter if your oil has enough water content to be conductive. Most hydraulic oils are insulating. So an electromagnetic flow meter usually will not work. Unless you have a fire-resistant hydraulic fluid like a water-glycol mix. Those fluids are conductive. We have shipped DN80 electromagnetic flow meters with PTFE liners to a steel mill in Turkey exactly for this.
Silver Instruments Recommended Meters for DN80 Hydraulic Oil
We stock three types. Each fits a different situation. You do not need to guess. Read these specific scenarios.
First, the oval gear flow meter. Model SIOG-DN80. This is our workhorse for pure hydraulic oil. It handles viscosities from 1 to 2000 cP without losing accuracy. Accuracy is 0.5% of reading. The gears are aluminum with FKM seals. Max pressure is 40 bar. It has a local LCD display and a 4-20 mA HART output. You can connect it straight to a PLC or a Silver Instruments paperless recorder. A service company in Australia uses this exact model to meter oil dispensed to offshore marine cranes. They mount it on a trolley. Portable.
Second, the Coriolis mass flow meter. Model SICM-DN80. This is for hydraulic oil batching into reactor vessels. A chemical plant in Indonesia asked us for this. They needed to know the mass in kg, not just volume. Because their recipe process is in weight percent. The Coriolis meter gives you mass flow, density, and temperature all from a single device. It works with hydraulic oil at any viscosity. No moving parts to jam. But it costs more. If your budget is tight and you only need volume, the oval gear is enough.
Third, a turbine flow meter. Model SITF-DN80. We only recommend this if your hydraulic oil is thin and clean, and your flow is steady. Viscosity under 20 cP is ideal. Accuracy is 1% of reading. The rotor spins on a tungsten carbide bearing. Some customers in the textile industry use this for hydraulic power unit return line monitoring. The flow is stable there. But if your oil goes through rapid temperature cycles, the viscosity shift will alter the meter factor. You will need to compensate with a PT100 input at the secondary instrument. We have a paperless recorder that does this math internally.
What to Check Before You Order a DN80 Hydraulic Oil Flow Meter
Engineers often skip this part. Then they email us later with a problem.
Measure the actual pipe inner diameter. A schedule 80 DN80 pipe has a different ID than schedule 40. Tell us the wall thickness. We need to match the meter bore exactly. A step change in diameter creates a jet. That accelerates the oil and wears gear teeth or rotor bearings.
Check your filter mesh size. A gear meter has tight clearances. We recommend a 74 micron strainer upstream. Without it, a small metal shaving from a pump failure will stop the meter dead. We have seen this on a mining truck workshop in Chile.
Tell us the maximum pressure spike. Hydraulic systems have pressure surges. A standard oval gear meter has an aluminum body rated to 40 bar. That is fine for a low pressure return line. But if you are on a high pressure line, say 200 bar, we need to use a carbon steel body. We can do that. It takes 4 weeks to build.
Temperature matters. Standard meters have an FKM seal. FKM is good up to 120°C. If your oil runs hotter, we change to PTFE or metal seals. A palm oil mill in Malaysia needed this for their hydraulic press loop. The oil sat at 140°C continuously.
DN80 Meter Connection and Output Signals
Flange standards trip up international orders. Our default is ANSI 150# raised face. That suits the Southeast Asian and Middle Eastern markets. But we also machine flanges to JIS 10K for the Japanese equipment installed in Thailand. Or EN 1092-1 PN16 for projects in Kenya built by European contractors. In your first inquiry, tell us the flange standard. Do not just say "DN80". That only gives the nominal size. It does not give the bolt circle diameter.
For the output, most engineers now want 4-20 mA HART. It lets them read flow rate from the control room and change the sensor range remotely. The oval gear meter gives a pulse output as standard. You can add the HART module. If you use our paperless recorder, the pulse input is direct. You do not need an external converter. The recorder does the totalizing. One screen shows rate, total, and temperature.
A Real Cost Analysis for a Hydraulic Oil Metering Skid
Here is a specific setup we sold to a lubricant blender in Vietnam. They blend hydraulic oil ISO VG 68. They fill 200 L drums from a DN80 header. We supplied one SIOG-DN80 oval gear flow meter with a pulse output, a PT100 temperature sensor in a thermowell, and a Silver Instruments SVR-8100 paperless recorder. The recorder corrects the volume to 15°C automatically. The whole system cost was USD 1,850 FOB Shanghai. They recovered the cost in 4 months just by eliminating overfills. Each drum overfill was about 0.8 L before. That adds up over 200 drums per day.
Five Key Questions Engineers Ask Us About DN80 Hydraulic Oil Flow Meters
Does the oval gear meter cause a pressure drop at high flow in a DN80 line?
Yes, but it is small with thin oil. At 500 L/min with ISO VG 32 oil, pressure drop across the SIOG-DN80 is about 0.4 bar. With ISO VG 150, it is 0.8 bar. If your system cannot afford this, move up to a Coriolis meter. Zero pressure drop.
Can I use an electromagnetic flow meter for standard hydraulic oil?
Normally no. Hydraulic oil is non-conductive. The minimum conductivity we need is 5 µS/cm. Standard oil is orders of magnitude below this. But fire-resistant water-glycol fluids have high conductivity. For those, a DN80 electromagnetic flow meter with a Hard Rubber liner works well.
How do you handle batch control with this meter?
The pulse output goes to a batch controller or a PLC input. Each pulse equals a fixed volume. Our oval gear meter outputs 10 pulses per liter. For a 150 L batch, the system counts 1500 pulses and shuts a valve. We can supply the entire panel with a touch screen controller.
What is the lead time for a DN80 hydraulic oil flow meter with a custom flange?
Standard ANSI 150# meters ship in 5 working days from our Shanghai stock. JIS or EN flanges with a PTFE liner add 15 working days. If you need ATEX Zone 1 certification for an offshore platform, add another 10 days for the certification documents.
Do you have local support in the Middle East?
We have a distributor partner in Dubai who keeps stock of the DN80 oval gear meter and spare seal kits. For Saudi Arabia, we ship DHL from Shanghai and provide video commissioning calls. Most issues are resolved on WhatsApp within one hour.
Send us your pressure in bar, temperature in °C, required flow range in L/min, and oil viscosity grade. We recommend the exact meter model and send a DN80 hydraulic oil flow meter price list and datasheet immediately.
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