Micro Refrigerant Flow Meter: Precision Lab Equipment; requires clean-room handling and micro-filtration.

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Micro Refrigerant Flow Meter for Clean-Room Lab Applications

Quick Answer: Silver Automation Instruments builds a micro flow meter for refrigerant mass flow measurement in clean-room environments. This meter handles flow rates from 0.05 kg/h up to 10 kg/h with ±0.1% of rate accuracy. It requires 10-micron absolute micro-filtration upstream and ISO Class 7 or better handling. Send us your refrigerant type, pressure, temperature, and pipe size to get a specific quote.

Why a Dedicated Micro Refrigerant Flow Meter Matters

Standard industrial flow meters lose accuracy when measuring mass flow below 1 kg/h. Refrigerant research labs and HVAC component test benches need repeatable data on low-GWP blends, R744, R134a, or R410A. In practice, a deviation of 0.05 kg/h can corrupt a compressor calorimeter run. Most engineers skip the general purpose meters here. They go straight to a direct mass flow sensor with Coriolis technology. We saw this pattern with a refrigerant lab in Melbourne that was testing R1234yf at 0.3 kg/h. Their old thermal meter drifted with ambient temperature. They switched to our SI-MRF series and stabilized their daily repeatability.

Clean-Room Handling and Micro-Filtration Are Not Optional

The sensor body contains hairpin shaped micro tubes. Any particle larger than 10 microns will lodge inside and shift the zero point. Because of this, every meter we ship comes with a certificate that states the required filtration grade. The installation manual calls for a 10-micron absolute filter mounted within 200 mm of the inlet. We also specify ISO Class 7 clean-room conditions during assembly, calibration, and field integration. In field service, one paint manufacturer in Southeast Asia ignored the filter change interval. Their meter drifted after four months. We traced the drift to silica fines from the refrigerant loop. After they added our recommended dual filter manifold, the drift disappeared. Here is the thing: do not treat micro-filtration as a nice to have. It defines the sensor lifetime and measurement stability.

Sensor Specifications and Materials

The Silver Automation Instruments micro refrigerant flow meter uses a 316L stainless steel wetted path as standard. Hastelloy C22 is available for high moisture CO2 or ammonia service. The integrated PT100 sensor reports fluid temperature. Mass flow accuracy reaches ±0.1% of rate for liquids and supercritical fluids. Density accuracy is ±0.002 g/cc. Process connections are as small as DN3 or DN4 with face seal or compression fittings. Maximum operating pressure stands at 100 bar. Fluid temperature range covers -40 °C to 125 °C. Output signals include 4-20 mA HART and RS485 Modbus RTU. Some customers also request pulse output for totalized mass. The meter electronics are housed in IP65 stainless enclosures, suitable for lab benches but not for outdoor washdown.

Typical Setup for a Refrigerant Test Bench

A common setup we see in HVAC research centers uses an SI-MRF-04 meter with a 10-micron filter assembly, a back pressure regulator, and a Coriolis density reference. The meter connects to a DAQ system via 4-20 m

Micro Refrigerant Flow Meter: Precision Lab Equipment; requires clean-room handling and micro-filtration.

A HART. Engineers log mass flow, density, and temperature at 1 Hz. In a calorimeter room, the meter measures refrigerant charge flow into the test loop. One marine refrigeration lab in Singapore runs this configuration with R744 at 80 bar and 31 °C. They needed stable measurement at 0.5 kg/h during transcritical cycling. Our meter maintained the target accuracy after we sized the filter for the high pressure drop.

Installation Notes for Low Flow Stability

Mount the sensor on a rigid bracket with zero stress on the process connections. Align the flow direction arrow. Avoid mounting near fan induced vibration. Perform a field zero calibration under process temperature and pressure, not just at ambient. If the meter will measure subcooled refrigerant, ensure the filter housing is rated for the lowest expected temperature to prevent ice bridging. We recommend a 25-micron strainer upstream of the 10-micron absolute filter for systems that may contain swarf from first commissioning. These notes come from our field commissioning checklist.

How to Request a Quote

Send us the following information so we can propose the correct meter model and filter skid: refrigerant fluid name, flow range in kg/h, operating pressure in bar, operating temperature in °C, pipe connection size and type, ambient environment (lab or enclosure), and whether you need Hazardous Area certification. ATEX Zone 1 and IECEx options exist for certain models. Direct your inquiry to [email protected]. You can also reach our application engineers by phone at +86-25-68650347 or by WhatsApp at +86-25-52155837. WeChat is available at +86 15365082610.

FAQ

What is the minimum flow rate the micro refrigerant flow meter can measure? The meter delivers specified accuracy from 0.05 kg/h. It can detect flow as low as 0.02 kg/h, but the accuracy statement applies above the published minimum. For flows below 0.05 kg/h, we recommend a specialized ultra-low flow version.

Why does the meter require micro-filtration? The sensor flow path has internal diameters under 1 mm. Particles larger than 10 microns can block the tubes or create asymmetric erosion. Filtration prevents measurement drift and avoids costly sensor cleaning or replacement.

Can this meter handle CO2 (R744) as a refrigerant? Yes. We supply Hastelloy C22 wetted parts and high pressure seals for supercritical CO2 service up to 100 bar. Specify R744 application when ordering so we can perform a high pressure calibration.

What output signals are available for lab DAQ integration? Standard outputs are 4-20 mA HART and RS485 Modbus RTU. Pulse output for mass totalization is optional. The HART signal provides mass flow, density, and temperature digitally without extra wiring.

How should the meter be cleaned after exposure to refrigerant oil? Flush the meter with a solvent compatible with the wetted materials. Never push solids through the sensor. After flushing, perform a filter integrity check. Laboratory standard cleaning procedures apply. We provide a recommended flush kit.