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Small Flow Meter For Low Flow Rate Fluid Control
Quick Answer: A dedicated small flow meter removes guesswork from dosing, pilot plant batching, and R&D when your flow drops below 50 L/h. Choose a Coriolis micro-tube meter for 0.01 kg/h chemical injection or an oval gear meter for 0.5 L/h viscous additives. Silver Automation Instruments ships both with 4-20 mA HART output, PT100 temperature compensation, and ATEX Zone 1 approvals where needed.
Why a Dedicated Meter Beats a Shunted Full-Size Device
Many engineers try to use one large flow meter with a bypass loop. In practice, the bypass ratio shifts with viscosity, temperature, and pressure, so you lose repeatability fast. A dedicated low flow meter eliminates that error. We have seen this on sites in the Philippines and Nigeria where a DN50 electromagnetic meter was bypassed to measure a 2 L/h chemical additive. The readings drifted by 30 percent after a 10 degree Celsius temperature change. A direct small flow meter holds steady across the whole batch.
Coriolis Micro-Tube Meters for Liquid Micro Flows
Silver Instruments supplies Coriolis mass flow meters starting at DN2 tube size. The sensor measures mass flow directly, so you do not need separate density or temperature compensation for most clean fluids. The DN2 sensor works from 0.01 kg/h up to 50 kg/h. Accuracy is 0.1 percent of rate with a density measurement down to 0.0005 g/cm3. A food flavour manufacturer in Indonesia uses this meter to dose 0.3 L/h of orange extract into a mixing tank. The meter talks Modbus RTU to their PLC and triggers a pneumatic valve when the batch total reaches 2.500 kg. The whole loop sits inside a stainless steel cabinet with an IP66 rated transmitter.
Oval Gear Meters for Viscous Low Flows
When the fluid hits 20 cP or higher, an oval gear meter often works better than a Coriolis meter for budget-sensitive projects. Silver Instruments oval gear flow meters measure flows from 0.5 L/h up to 1200 L/h. The body materials include 316L stainless steel and PPS with PTFE gears. A paint manufacturer in Saudi Arabia doses 0.8 L/h of cobalt dryer into a solventborne paint base. The oval gear meter runs with a 4-20 mA HART output and a local LCD totalizer. Because the gears displace a fixed volume per rotation, the reading stays accurate even when viscosity drifts from 50 to 200 cP during a shift. The meter also carries an ATEX Zone 1 certification, which matters inside a solvent-handling plant.
Thermal Mass Flow Meters for Low Gas Flow
For nitrogen blanketing, biogas research, or CO2 injection, Silver Instruments thermal mass flow meters handle gas flows from 0.02 kg/h upwards. The sensor has no moving parts and
Selection Parameters That Avoid Field Failures
Most engineers skip this part and regret later. Send us five numbers and you will get a meter that works on day one. First, state your minimum and maximum flow in kg/h or L/h. Second, give the fluid viscosity at operating temperature in cP. Third, tell us the operating pressure in bar and temperature in degree C. Fourth, specify the pipe connection size in DN or inch. Fifth, confirm the output signal: 4-20 mA HART, pulse, or RS485 Modbus. Last year a biodiesel plant in Malaysia requested a meter for 0.8 L/min of methanol at 0.5 cP, 3 bar, and 30 degree C. We supplied a Coriolis DN2 meter with PTFE lining and an integral transmitter. The unit was on their test skid within ten working days.
Frequently Asked Questions
What is the lowest flow rate a Coriolis meter can measure? With a DN2 tube the minimum measurable flow is 0.01 kg/h for liquids with density close to water. For gases the minimum is around 0.1 kg/h depending on density.
Do I need temperature compensation for an oval gear meter? Oval gear meters measure volumetric flow. A PT100 sensor measures temperature and the transmitter converts to mass flow if you need net kilos. Silver Instruments oval gear meters include a PT100 port as standard.
Can the small flow meter handle ATEX Zone 1? Yes, many of our low flow Coriolis and oval gear meters come with IECEx and ATEX Zone 1 certification. Request the Ex certificate when you order.
What is the delivery time for a micro flow meter? Standard DN2 and DN3 Coriolis meters with 316L wetted parts ship in 7 to 10 working days from our factory. Custom linings or exotic materials may add two weeks.
Do you offer a flow meter with local display and totalizer? All Silver Instruments low flow meters can be equipped with an integral LCD that shows rate, total, and diagnostic alarms. The totalizer is battery-backed so it does not lose batch data on power loss.
Get a specific quote now. Send us your pressure (bar), temperature (degree C), pipe size (DN), and flow range to [email protected]. You can also review the full data sheets on our dedicated low flow meter pages at flow-meter.com.au. Our engineers answer within one business day with a PID-matched quotation.