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Refrigerant Flow Meter ml/min: Microfluidic Dispensing Controls for Precision R&D
Quick Answer: For microfluidic dispensing of refrigerants at ml/min flow rates, a Coriolis mass flow meter gives you direct mass measurement that is not affected by density changes. Silver Automation Instruments supplies micro Coriolis meters with ranges from 0.5 ml/min to 500 ml/min, ±0.2% accuracy, and ATEX / IECEx approvals. This meter is built for HVAC R&D labs, pharmaceutical spray drying, and chemical microreactor control.
Why Volumetric Flow Falls Short in Refrigerant Microfluidics
Refrigerants like R410A, R134a, and CO2 change density with slight temperature and pressure shifts. A volumetric meter such as a turbine or gear meter measures volume, then estimates mass using density assumptions. In a research setup, a 2°C shift can add 3 to 5% error. That makes repeatable dosing at 10 ml/min nearly impossible. We have seen this on customer sites many times.
In one example, a heat pump lab in Malaysia tried to calibrate a microchannel evaporator using a gear meter. The morning readings drifted by 8% as the cold room warmed up. They switched to a micro Coriolis and locked mass flow to ±0.15% instantly.
Silver Instruments Micro Coriolis for Refrigerant ml/min Flow
Our SI-025 micro Coriolis meter is designed for DN1 to DN3 tubing. It measures from 0.2 ml/min up to 500 ml/min with 0.2% of rate accuracy. Wetted parts are 316L stainless steel and Hastelloy C-22, safe for aggressive refrigerants and liquid CO2. The process connection is 1/8 inch or 3 mm compression fitting, common in microfluidic skids.
Outputs include 4-20 mA HART, Modbus RTU, and pulse. You can integrate it with a syringe pump or a micro gear pump. The meter response time is under 50 ms, so you can close-loop control a piezoelectric valve at 20 Hz. For flammable refrigerants like R290 propane, ATEX Zone 1 / IECEx certification is available. Max pressure is 320 bar, max fluid temperature 150°C.
Microfluidic Dispensing Controls in R&D
Precision R&D often demands that you deliver a defined refrigerant mass into a reaction chamber or a thermal test loop. A typical setup uses a pressure vessel, a micro needle valve, and a Coriolis meter as the feedback sensor. The PLC reads 4-20 mA HART and adjusts the valve to hold 15.0 ml/min. Because mass flow is invariant to density, you can switch from R134a to R1234yf and only change the setpoint, not recalibrate.
Pharmaceutical labs use microfluidic refrigerant flow meters to control the cooling rate of spray drying nozzles. Last year a biotech customer in Singapor
How to Order a Refrigerant Flow Meter for Your ml/min Application
Here is the thing: you need to match the meter size to your actual flow range, not just pipe diameter. Many R&D engineers oversize the meter and lose low-flow resolution. Send us your refrigerant type, pressure (bar), temperature (°C), pipe size (DN), and required flow range in ml/min. We will select the tube size and wetted material for you. Email [email protected] or call Tel: +86-25-68650347.
You can also reach us on WhatsApp: +86-25-52155837 or WeChat: +86 15365082610. Our team ships to Australia, SEA, Middle East, Africa, and Latin America from Nanjing, China. Visit flow-meter.com.au for data sheets and CAD drawings.
Frequently Asked Questions
Q: What is the minimum flow rate your micro Coriolis meter can measure for refrigerant?
A: The SI-025 measures down to 0.2 ml/min of liquid refrigerant. For gas-phase refrigerant, the minimum depends on density; with R134a at 20 bar we can detect 5 g/h. Always provide your process conditions.
Q: Can the meter handle two-phase refrigerant at the inlet?
A: A Coriolis meter works best with single-phase liquid. If vapor bubbles are present, the measurement error increases. We recommend installing a small filter-dryer and subcooling the refrigerant to ensure liquid-only flow.
Q: Is the SI-025 suitable for high-pressure CO2 in transcritical cycles?
A: Yes. The standard version handles 320 bar, and we have a 500 bar high-pressure option. Wetted parts are Hastelloy C-22 to resist carbonic acid formation. Many CO2 heat pump research labs in Europe and Australia use it.
Q: What output protocols does the meter support for microfluidic automation?
A: 4-20 mA HART, Modbus RTU over RS-485, and frequency/pulse. For high-speed control loops, we recommend Modbus at 38.4 kbps with floating point registers. An M12 Industry 4.0 connector is standard.
Q: How do I validate calibration for ml/min refrigerants?
A: We factory calibrate with water and apply a density correction factor for your refrigerant. You can verify on site using a beaker and scale method: run the meter for 10 minutes, weigh the collected refrigerant, and compare mass total. The typical deviation is less than 0.2%.
Send us your specs. Get a quote within 24 hours. Email: [email protected] | Tel: +86-25-68650347 | WhatsApp: +86-25-52155837 | WeChat: +86 15365082610
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