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Droplet Flow Meter: Precision Microfluidic Laboratory Liquid Dosing Senses
Quick Answer: For microfluidic liquid dosing from 0.01 mL/min to 50 mL/min Silver Automation Instruments recommends a DN2 to DN15 Coriolis mass flow meter. This meter reports mass flow, density, and temperature on a 4-20 mA HART loop. Send your liquid type, viscosity in cP, flow range in mL/min, pipe size in DN, and pressure in bar for a quote.
What a Droplet Flow Meter Senses in Microfluidic Dosing
A droplet flow meter in laboratory microfluidics senses very small continuous flow or discrete liquid volume. Many labs dose water, methanol, reagent, or dye into microchannels. The sensing challenge starts below 0.05 mL/min because the signal is weak and the dead volume can delay response. Silver Automation Instruments supplies a DN2 Coriolis meter that detects changes in mass flow within 80 ms. A lab in Queensland used this meter to dose water at 0.05 mL/min into a microchannel and held repeatability within ±0.2 percent of reading.
Key Sensing Requirements for Precision Liquid Dosing
Microfluidic dosing has tight limits. Dead volume should be under 0.5 mL. The flow path should match the tube size. A DN2 or DN4 sensor fits most bench setups. For reagent dosing a flow shift of 0.1 mL/min can spoil a test. The meter should offer repeatability of ±0.2 percent of reading or ±0.01 mL/min whichever is larger. The built in Pt100 temperature sensor reports liquid temperature to the PLC. Outputs include 4-20 mA HART, RS485 Modbus, and pulse for totalizer cards.
Recommended Flow Meter Types from Silver Automation Instruments
For water and low viscosity reagents use a micro Coriolis mass flow meter from DN2 to DN15. This meter covers 0.01 mL/min up to 180 kg/h depending on tube size. For gas dosing in a laboratory choose a thermal mass flow meter with ranges from 0.1 mL/min to 200 L/min. For higher viscosity oils above 50 cP select an oval gear flow meter with DN4 or DN6. The oval gear meter needs no straight pipe and works with viscous liquid.
A Customer Site Example from Southeast Asia
Last year a customer in Vietnam needed to dose methanol at 0.1 mL/min into a microfluidic reactor. The line size was DN2. Pressure stayed near 6 bar and temperature was 25 °C. Silver Automation Instruments supplied a DN2 Coriolis mass flow meter with 4-20 mA HART output and a local display. Installation took half a day. The customer averaged flow signal over 500 ms in the PLC. After two weeks the reading drift stayed below 0.02 mL/min. This field detail matters during validation.
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Calibration and Signal Output Notes
Most engineers skip this part. Do not skip it. If the liquid conductivity is below 10 µS/cm an electromagnetic flow meter will not work. Use a Coriolis meter instead. Calibration should use the actual liquid or a close match. For micro flow water calibration data is enough in many cases. For methanol or ethanol the density based mass flow reading still works. The meter sends density in kg/m³ and temperature in °C over HART. A paperless recorder from Silver Automation Instruments logs flow, pressure, and temperature on one 4-20 mA input block. This creates a clean audit trail for pharmaceutical and food batch records.
FAQ
Q: What is the smallest flow rate Silver Automation Instruments can measure for microfluidic liquid dosing?
A: The DN2 Coriolis mass flow meter reads stable flow from 0.01 mL/min. Below that value the signal to noise ratio drops. For volumes below 0.01 mL/min a syringe pump with an internal sensor may be a better fit.
Q: Can a droplet flow meter handle continuous flow and discrete droplet sensing?
A: Industrial Coriolis and thermal mass flow meters measure continuous flow. True discrete droplet sensing needs a high speed camera or an optical gate. For process control a continuous low flow sensor gives more repeatable dosing data.
Q: Which output options are available?
A: 4-20 mA HART, RS485 Modbus, and pulse output. The HART option is popular because it sends flow, density, and temperature on one pair of wires.
Q: Does the meter require straight pipe for microfluidic dosing?
A: A Coriolis meter does not need straight upstream pipe. This helps when the meter sits close to a microfluidic chip or reactor inlet.
Q: What information should I send for a quote?
A: Send your liquid type, viscosity in cP, flow range in mL/min or kg/h, pipe size in DN, temperature in °C, and pressure in bar to Tel +86-135-1213-1526 or WhatsApp 86-135-12131526. We will reply with model, accuracy, and delivery time.
For a clear quote on a droplet flow meter or microfluidic dosing setup send your liquid type, viscosity in cP, flow range in mL/min, pipe size in DN, temperature in °C, and pressure in bar. Silver Automation Instruments serves industrial and laboratory customers in Southeast Asia, Oceania, Latin America, Africa, and the Middle East. Call +86-135-1213-1526 or use WhatsApp 86-135-12131526. The team will match your dosing conditions to a DN2 Coriolis meter, a thermal mass flow meter, or an oval gear flow meter. The full product list is on flow-meter.com.au.
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