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Cooking Oil Flow Meter DN25 for Restaurant Supply and Bottling Layouts
Quick Answer: A DN25 oval gear flow meter is the most direct choice for cooking oil lines in restaurant bulk supply and small bottling setups. It handles viscosities from 10 cP to 1,000 cP without recalibration. You get a 4-20 mA or pulse output signal that connects to a simple batch controller for fill volumes of 1 L, 5 L, or 20 L cans.
We ship these flow meters to many markets. Last month a cooking oil distributor in Ho Chi Minh City ordered 12 units of our OGF-DN25 model. They fill 20 L pails for street food stalls. The flow meter cost was under USD 420 per unit. The setup used a 24 VDC supply and a local PLC for preset batching.
Restaurant supply companies often prefer the DN25 size. The pipe run between the storage tank and the filling nozzle is usually 1 inch or 25 mm. A DN25 flow meter bolts straight in. No reducer. No custom flange. In practice this makes the installation fast and free of extra leak points.
Why Oval Gear and Not Other Types
Oval gear flow meters suit edible oil because they measure true displacement. A turbine meter loses accuracy when viscosity shifts from 40 cP to 80 cP between morning and afternoon batches. Here is the thing. Palm oil at 35 °C in Jakarta flows differently than soybean oil at 20 °C in Melbourne in winter. The oval gear meter does not care. 0.5% accuracy holds steady.
Coriolis meters would also work, but the cost is 3 to 4 times higher for the same line size. Most restaurant supply chains do not need Coriolis unless they sell to a multinational with strict mass balance reporting. We have seen this on customer sites many times.
Bottling Layouts for 1 L to 20 L Containers
A typical layout places the DN25 flow meter after a coarse filter and before a manual ball valve or pneumatic shut-off nozzle. The output pulse goes to a Silver Instruments SI-RTD batch display. An operator sets 5.00 L and presses start. The controller closes a solenoid valve when total reaches 5.00 L. Fill accuracy stays within ±15 mL for sunflower oil at 50 cP.
For a semi-automatic 4-head filler in a small bottling plant near Nairobi, we used one DN25 master meter on the main header. The cost was lower than four small meters. The trade-off was that all heads share a single flow measurement. But here is where many engineers skip a detail. You need a check valve on each fill branch. This prevents backflow from affecting the batch total when one head finishes early.
Materials and Food-Grade Compliance
The OGF-DN25 body is 304 stainless steel. Rotors are PPS or aluminum depending on oil
Most engineers want to know about cleaning. Hot water flush at 80 °C through the meter is safe if you keep flow velocity below 2 m/s. CIP systems with caustic soda are not recommended. Instead we tell customers to remove the meter from the line during deep cleaning. The meter weighs only 3.2 kg, so one worker can handle it.
Pricing and What You Need to Send Us
We do not hide pricing. A basic DN25 oval gear flow meter with pulse output starts at USD 390 ex-works. Add a local display and 4-20 mA + HART output, and the price is around USD 560. Quantity discounts apply from 10 units. Freight to Southeast Asia, the Middle East or East Africa is 3 to 7 days by air via DHL.
For precise pricing and lead time, send us your pressure (bar), temperature (°C), pipe size (DN), and flow range. Also tell us which oil you move. Different oil densities change the pulse scaling factor. Include your country and we can provide a shipping cost the same day. Reach out at flow-meter.com.au or flow-meter.com.au.
FAQ
Can the DN25 meter handle hot oil at 100 °C straight from the fryer? Yes, if you select the PTFE seal version. The standard FKM seal is rated to 80 °C. Always confirm peak temperature when you order.
Does the meter require a straight pipe run upstream? No straight run is needed. Oval gear meters are not sensitive to flow profile. You can mount them right after an elbow or valve. This saves space on a small bottling skid.
How do I connect the meter to an Arduino or Raspberry Pi? Use the pulse output. The meter gives an NPN open collector pulse signal. Pull it up to 5 V or 3.3 V with a 10 kΩ resistor. One pulse equals about 10 mL for the DN25 size. Check the calibration sheet for the exact K-factor.
What is the minimum volume I can batch accurately? With the standard pulse output, we recommend a minimum batch of 0.5 L. Below that, the start-stop error becomes visible. For 200 mL batches, an encoder output version adds cost but improves accuracy.
I need a flow meter for olive oil and sunflower oil on the same line. Do I need two calibration curves? No. Oval gear meters measure volume directly. Viscosity changes have almost no effect. You only need one K-factor for both oils. The density difference does not influence the volume reading.
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