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Sunflower Oil Flow Meter DN25: Food-Grade Solutions for In-Line Processing
Quick Answer: Silver Instruments supplies a DN25 oval gear flow meter built for sunflower oil in-line processing. Its positive displacement design holds ±0.5% accuracy even when oil viscosity moves from 40 cP to 90 cP. The meter carries EC 1935/2004 and FDA compliance, with 316L wetted parts and EPDM seals.
Most packaging lines and batch blending systems run sunflower oil through DN25 pipes. Temperature swings during winter startup or right after deodorization change viscosity fast. A turbine meter drifts. A Coriolis meter works but costs more than necessary for a 25 mm line. An oval gear meter sits right in the sweet spot. It traps a fixed volume between two precision gears and keeps counting correctly regardless of honey-like or water-like flow. We have supplied these meters to edible oil plants in Malaysia, Vietnam, and Kenya. In each case the request was the same: a meter that ignores viscosity shifts and survives daily hot water CIP cycles.
Why Oval Gear Technology Works for Sunflower Oil
Sunflower oil at 20 °C can hit 70 cP. At 60 °C it drops below 25 cP. A velocity based meter loses calibration across that range. Our oval gear meter has a measuring chamber with two oval shaped rotors. Every full rotation sweeps a known volume. The result is a direct volume reading that does not depend on Reynolds number or velocity profile. The standard accuracy is ±0.5% of reading. Repeatability sits at 0.03%. For bottling lines filling 1 litre or 5 litre containers, that repeatability stops overfill giveaways. We often pair the meter with a batch controller preset. One dairy substitute producer in Thailand cut their oil giveaway by 1.2% after switching from a paddle wheel sensor.
Food Grade Certification and Materials
Wetted parts matter in edible oil service. Our standard DN25 meter body uses 316L stainless steel with Ra less than 0.8 µm on product contact surfaces. Rotors are PEEK or 316L depending on cleaning temperature. Seals come in EPDM, PTFE, or FKM. The meter complies with EC 1935/2004 for food contact and FDA CFR Title 21. Tri clamp connections to DIN 32676 are typical for DN25, though BSP or NPT threads are available when the plant piping is threaded. Dead space is minimal. The design allows full draining. Most engineers skip the extra bypass and put the meter directly in the main oil line right before the filler.
Watch the Filtration
Sunflower oil straight from the storage tank carries tiny sediment particles. Oval gear meters have tight clearances. A strainer or Y type filter with 60 mesh (250 micron) is mandatory upstream. We have seen meters jam on customer sites when the filter was removed during a night shift. In one small refinery in the Philippines, substituting a 30 mesh screen solved a repeat blockage issue without adding noticeable pressure drop. Across a DN25 oval gear meter, pressure drop at 10 L/min is typically below 0.2 bar for sunflower oil at 30 °C. That is low enough for gravity feed tanks as well.
Installation and Signal Output
The meter mounts horizontally or vertically. When measuring hot oil right after the deodorizer, we recommend a straight run of 3 x DN upstream and 2 x DN downstream just to reduce pipe stress. Standard output options are a reed switch pulse or NPN/PNP open collector. The pulse resolution on the DN25 model is around 100 pulse
Quick Case Note: A Bottling Line in Australia
Last year a sunflower oil bottler near Melbourne asked us for a DN25 food grade flow meter. They were running 1 L and 2 L PET bottle fillers at 12 cycles per minute. The old magnetic flow meter was reading zero when the oil was cold. We supplied an oval gear meter with PTFE seals and a pulse output. They connected the pulses to their Omron counter. After one week they ordered two more units for the other lines. The total cost per point stayed under the budget they had set for inline Coriolis meters. That kind of direct swap happens often.
Specifications at a Glance
You do not need a long datasheet page to send a quote. Here are the numbers that matter for a DN25 sunflower oil application. Flow range: 0.6 to 6 m³/h, or 10 to 100 L/min depending on viscosity. Accuracy: ±0.5% of reading, optional ±0.2% with linearization. Viscosity range: 1 to 1000 cP. Process temperature: -20 °C to 120 °C for standard, up to 180 °C with high temperature option. Pressure rating: PN40 (40 bar). Wetted materials: 316L, PEEK, EPDM or PTFE. Connections: Tri clamp 25 mm, DIN 11851, BSP 1 inch or NPT 1 inch. Output: pulse, 4-20 mA, HART. Enclosure: IP65 or IP67.
Frequently Asked Questions
1. Can a DN25 oval gear meter handle CIP cycles?
Yes. The meter tolerates hot cleaning solutions up to 120 °C at the rated pressure. Select EPDM seals for standard CIP and PTFE or FFKM for aggressive chemical cleaning. Always check fluid compatibility with the seal material.
2. What is the typical accuracy in sunflower oil service?
±0.5% of reading on a calibrated span. For filling small 250 ml bottles we offer a linearization curve that brings it to ±0.2% across the narrow flow band common in bottling machines.
3. Do I need temperature compensation?
Volume is measured at process temperature. If you need mass in kg, install a PT100 and convert in the PLC or batch controller. Our 4-20 mA + HART version can accept an external RTD input for density compensation using the sunflower oil density table stored in the transmitter.
4. Can I use this meter for other edible oils?
Absolutely. The same DN25 meter works for palm oil, soybean oil, canola oil, and corn oil. The only thing that changes is the viscosity correction factor for mass flow conversions.
5. How do I get a firm quote fast?
Send us your flow range in L/h or kg/h, oil temperature, pipe size (DN), connection type, and preferred output signal. Tell us your country and we will include shipping and local certification support. Direct email to our projects team includes all that in one go.
Next Step: If you are sizing a sunflower oil flow meter for a DN25 line, send us your pressure (bar), temperature (°C), pipe size (DN), and flow range. Our engineers will propose a food grade oval gear meter with the right seals, connection, and output. You receive a single page technical proposal and a price in AUD, USD, or EUR within one business day. Visit www.flow-meter.com.au or email the projects desk and mention “DN25 Sunflower Oil.”
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