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Oil Flow Meter Digital: Electronic High-Viscosity Petroleum Gear Gauges
Quick Answer: A digital oil flow meter with positive displacement oval gears handles high-viscosity petroleum from 5 cP to 2000 cP with better repeatability than a turbine meter. Silver Automation Instruments supplies these electronic gear gauges in DN15 to DN80 sizes with a digital totalizer, pulse output, 4-20 mA, RS485 Modbus, and optional HART. Send your viscosity in cP, pipe size DN, pressure in bar, temperature in °C, and flow range in kg/h or L/h for a specific model and price.
What Digital Gear Gauge Works for High-Viscosity Petroleum
Here is the thing with heavy petroleum. A turbine flow meter loses accuracy when oil gets thick because the rotor slips against the fluid. An oval gear meter is different. Two oval shaped gears rotate inside a measuring chamber and trap a fixed pocket of oil on each rotation. The pulse pickup counts every gear tooth or magnet pass. That count becomes rate and total on the digital display. Because the meter measures actual volume, not velocity, the readout stays stable from 5 cP to 2000 cP.
We have seen this on customer sites many times. A fuel oil depot in Vietnam used a DN40 oval gear meter to track 380 cSt bunker fuel transfers from day tanks to generators. They reported stable totals where their old turbine meter underread by about 8 percent. The difference is the mechanical positive displacement principle.
Model Sizes and Flow Ranges
Silver Automation Instruments supplies the LC series oval gear flow meter with an electronic digital display for petroleum service. Common sizes are DN15, DN20, DN25, DN32, DN40, DN50, and DN80. A DN25 meter often covers 60 to 600 L/h for light and medium petroleum. A DN50 meter covers roughly 300 to 3000 L/h for heavy oil at low flow velocity. For very thick petroleum above 2000 cP we quote larger gear clearances and lower speed to reduce pressure drop.
Body options include cast iron, cast steel, and 316 stainless steel. Most petroleum oil applications use cast iron or cast steel. For corrosive or high purity oil we use 316 stainless steel. Gear material options include aluminum, cast iron, and PEEK for chemical compatibility. Bearings can be graphite, tungsten carbide, or ceramic based on your fluid.
Accuracy, Viscosity, and Temperature Limits
The electronic digital register shows rate and total at the same time. Standard accuracy is plus or minus 0.5 percent of reading for oil between 5 cP and 2000 cP. Repeatability is often 0.1 percent. A paint manufacturer in Southeast Asia ran 800 cP alkyd resin through a DN32 oval gear meter. They used a 4-20 mA signal to a PLC and kept the local totalizer for batch records. Because the meter captures volume, the total stayed stable after temperature swings.
Standard seals handle 120°C. High temperature options reach 180°C with PTFE or metal seals. For mass flow in kg/h we can integrate a PT100 temperature sensor into the converter. You enter the density for your petroleum grade in the display menu. The display then calculates mass flow from volume and density.
Output Wiring and Batch Control
The electronic converter on the gear gauge can include p
Most engineers skip this part but it matters. If you need automatic batch control, order the converter with two relay outputs. One relay stops the pump at a target batch volume. The second relay can trigger a warning. This avoids overshoot on high-viscosity oil when the pump does not stop instantly.
Installation and Filtration
Positive displacement gear meters do not need long straight runs. They do need clean oil. Install a Y strainer or basket filter upstream. Use a 60 mesh strainer for light oil and a 20 mesh strainer for heavy oil. Keep a bypass loop around the meter for maintenance. Do not let air enter the gear meter. A slug of air spins the gears and the digital totalizer counts volume that is not oil.
For petroleum above 2000 cP we often recommend a heating jacket or heat trace on the pipe. The gear meter itself can be ordered with a heating jacket. Keeping the oil at a stable temperature reduces viscosity swings and improves total accuracy.
Pricing and Delivery
We quote from our Nanjing office and ship to Southeast Asia, the Middle East, Australia, Latin America, and Africa. Standard DN25 and DN50 meters are often ready in 5 to 10 working days. Custom bearings, stainless steel bodies, ATEX certificates, and heating jackets add lead time. Send us your pressure (bar), temperature (°C), pipe size (DN), viscosity (cP), flow range (kg/h or L/h), and output signal for a price.
FAQ
Q1: What viscosity range can the LC series handle?
Standard meters handle 5 cP to 2000 cP. Higher viscosity up to 10,000 cP may require larger clearances and a slower gear speed. We need fluid data before we recommend a model.
Q2: Can this oil flow meter digital show rate and total at the same time?
Yes. The local display has a rate line and a totalizer. The pulse output goes to a PLC or remote totalizer. The 4-20 mA signal is for rate only.
Q3: Is this meter suitable for ATEX Zone 1?
Yes with an intrinsically safe pickup. The local display must be mounted in the safe area or ordered with an approved enclosure. Tell us the gas group and zone before ordering.
Q4: Does the gear meter work with crude oil?
Yes if the crude is filtered and the viscosity is inside the range. For abrasive crude we use hard bearings and possibly tungsten carbide bushes. A 40 mesh strainer is the minimum upstream.
Q5: What information do you need for a quote?
Fluid type, viscosity in cP, flow range in kg/h or L/h, pressure in bar, temperature in °C, pipe size DN, output signal, and hazardous area classification. Send these details to Silver Automation Instruments.
Contact: Silver Automation Instruments, Tel +86 25 68650347, WhatsApp +86 25 52155837, WeChat +86 13512131526. For product selection see flow-meter.com.au
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