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Sesame Oil Flow Meter Small Batch Precision Dispensing
Quick Answer
For precision dispensing of sesame oil in small batches, oval gear positive displacement flow meters deliver repeatable accuracy even at low flow rates. Silver Automation Instruments supplies meters with flow spans from 0.02 L/h to 120 L/h, handling viscosities up to 1000 cP. Send your batch volume, oil temperature, and line size for a meter matched to your filler.
We have seen these meters cut waste on lines filling bottles from 100 ml to 5 litres. A sesame paste producer in Malaysia used a DN4 oval gear meter to control a 500 ml fill within +/- 1 g repeatability.
Why Oval Gear Meters Work for Sesame Oil
Sesame oil viscosity typically ranges from 60 cP to 80 cP at 20 °C. Thin oil can slip past some meter types. Oval gear meters use meshing rotors that trap fixed volumes of fluid. Slip is minimal down to very low flow. This makes them a go-to choice for batch dispensing where every drop counts.
Because the meter output is a pulse signal proportional to volume, PLC fillers can stop a valve exactly after counting a preset number of pulses. There is no need to compensate for variable flow profiles as with turbine meters.
Real Batching Accuracy from a Field Example
Last year a customer in Vietnam built a filling unit for toasted sesame oil in 250 ml bottles. They needed to fill 30 bottles per minute with a dosing tolerance of +/- 1.5 ml. Silver Instruments supplied a compact oval gear meter with DN6 Tri-Clamp connections and a PT100 temperature probe. The meter output raw pulses to a PLC that stopped a pneumatic valve. Field tests showed average dosing error of 0.3 ml over a 1-hour run, well within target.
Because sesame oil temperature in their plant shifted from 22 °C in the morning to 35 °C by noon, the viscosity dropped. The PT100 allowed the PLC to apply a volume correction factor. Without that correction, the error would have grown to over 2 ml per fill.
Key Specifications to Request
Ask your supplier for the actual test report at the viscosity of your product. Many catalog sheets show water accuracy, which does not represent sesame oil. For small batch work under 1 litre, request a meter with a minimum flow rate at least half of your dosing rate. A 0.5 L/h minimum flow meter will not perform well when you try to dose 0.2 L/h. Silver Instruments meters list minimum flow rates for oils at 60 cP, not just water.
Specify wetted materials. EPDM or PTFE seals are common. Ensure the meter body is stainless steel 304 or 316L. If you require CIP cleaning, ask about the rotor clearance and drainability. Surfaces in contact with oil must be food-grade, compliant with FDA or EU 1935/2004.
Output options include NPN/PNP open collecto
Integrating the Flow Meter into Your Dispensing System
Install the meter close to the filling nozzle to reduce unaccounted pipe volume. Use a short straight run upstream. Oval gear meters do not need long straight pipe like turbine meters, but avoid installing right after a 90 degree elbow or a partially closed valve. A simple Y-strainer of 200 mesh prevents particles from jamming the rotors. Sesame oil can carry fine sediment from seed processing.
For batch control, we often pair the meter with a batch controller like the Silver Instruments BC-100T. It accepts pulse inputs, allows quick setting of batch quantity, and provides relay output to drive a solenoid valve. The controller can store up to 30 recipes for different bottle sizes.
FAQ: Small Batch Sesame Oil Flow Measurement
Which flow meter type is best for sesame oil batching? Positive displacement oval gear meters are the standard choice because they directly measure volume with minimal slip over a wide viscosity range. Coriolis mass meters can also work but cost significantly more per point.
Can I measure a 50 ml batch accurately? Yes, with a micro oval gear meter. Silver Instruments model OGM-04 covers 0.1 to 10 L/h and can accurately batch 50 ml when paired with a fast valve. We have documented repeatability within 0.5 ml.
Does temperature affect the measurement? Yes. Sesame oil density and viscosity change with temperature. A PT100 sensor provides real-time compensation when the PLC adjusts volume from the measured pulse count. Without compensation, a 10 °C shift can cause more than 1% error.
What signal output do I need for a PLC filler? Pulse output is most common. The PLC counts pulses to determine volume. A typical K-factor might be 1000 pulses per litre. 4-20 mA and Modbus are also supported for integration with SCADA or HMI panels.
What connections are typical for food-grade lines? Tri-Clamp sanitary connections are standard for low-pressure lines. For higher pressure, RJT or DIN 11851 fittings are available. We supply meters from DN4 to DN25 with food-grade seals and surface finish Ra ≤ 0.8 µm.
Send Silver Instruments your pressure (bar), operating temperature (°C), pipe size (DN), and required flow range (L/h or kg/h) for a quote. Include the batch volume and target tolerance. We will propose a meter and batch controller set tested for your specific sesame oil conditions. See our Coriolis mass flow meter for high-value blending or oval gear flow meter for general dispensing.