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Refrigerant Flow Meter kg/h: Heavy-Duty Calibration for Industrial Chiller Networks
Quick Answer: For industrial chiller networks, measuring refrigerant mass flow in kg/h is the most reliable way to verify system capacity and detect refrigerant leaks. Silver Instruments supplies direct mass flow Coriolis meters with heavy-duty calibration on real refrigerants, not just water. Expect accuracy of ±0.1% of rate, output options like 4-20 mA HART, and faster on-site commissioning because the meter is already tuned for your refrigerant.
Why Mass Flow Units (kg/h) Matter More Than Volume Flow
Volume-based flow meters like turbines or vortex units report m3/h or L/min. When refrigerant temperature swings from -10°C to 50°C, volume readings drift even if the mass remains constant. A chiller in a dairy plant in Australia was seeing 8% seasonal deviation on a turbine meter. After switching to a Silver Instruments Coriolis meter calibrated in kg/h for R134a, the plant found their actual refrigerant charge variation was less than 0.5%. Here is the thing: cooling capacity calculations always tie to mass flow, not volume. So kg/h gives a direct link to kW of cooling.
Heavy-Duty Calibration: Real Refrigerant, Real Conditions
Many calibration labs use water and then apply a correction factor. For CO2 transcritical chillers that operate at 130 bar, water calibration does not mimic the fluid behavior. Silver Instruments calibrates in a dedicated refrigerant lab in Nanjing with R134a, R1234ze, R513A, R290 propane, and ammonia. A recent batch of 12 meters for a chiller manufacturer in Indonesia was calibrated at 35 bar with R513A at a flow range of 800 to 8000 kg/h. Each meter achieved a repeatability of ±0.08% over three runs. We also match density calibration to your plant operating temperature, which cuts the offset you would see from generic factory curves. Most engineers skip this detail, but it saves days of field tuning.
Coriolis Meter Models for Refrigerant kg/h Measurement
We recommend 316L stainless steel wetted parts for HFC and HFO refrigerants. For ammonia, we use carbon steel or special alloys. Below are typical models:
SI-008 (DN8): 1 to 100 kg/h, suitable for small chillers and lab R&D
SI-015 (DN15): 5 to 600 kg/h, popular for air-cooled chiller refrigerant loops
SI-025 (DN25): 100 to 10,000 kg/h, fits most industrial centrifugal chillers up to 2 MW
SI-040 (DN40): 500 to 40,000 kg/h, for large ammonia or CO2 cascade systems
All meters output 4-20 mA HART and Modbus RTU. For hazardous refrigerant environments like propane in ATEX Zone 1, we supply explosion-proof enclosures with Ex d IIC T4 certification.
Field Installation Tips for Chiller Networks
Mount the Coriolis meter in the liquid line downstream of the condenser, before the expansion valve. This ensures single-phase liquid and stable readings. We have seen at a site
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Get a Quote for Your Chiller Refrigerant Flow Meter
Tell us your refrigerant (R134a, R513A, R717 ammonia, R744 CO2, etc.), normal flow range in kg/h, pipe diameter (DN), and operating pressure and temperature. Email [email protected], call +86-25-68650347, or message us on WhatsApp: +86-25-52155837. You can also reach us via WeChat: +86 15365082610. Our application engineers will propose a calibrated flow meter with a 2-week delivery time, including test reports showing kg/h accuracy under your conditions. We ship from our factory to Southeast Asia, Oceania, and Middle East customers within days via DHL or sea freight.
Frequently Asked Questions
Can your meter measure refrigerant flow in partially charged systems?
Yes. Our Coriolis meters can handle liquid with up to 5% entrained gas. For larger gas fractions, we recommend a degassing solution upstream. But for normal chiller start-up with minor bubbles, the meter still provides accurate kg/h mass flow.
What is the pressure drop across your Coriolis meter for R410A at 3,000 kg/h?
For a model SI-025 at 3,000 kg/h R410A at 20°C, pressure drop is around 0.2 bar. We can provide exact values if you share density and viscosity data. Low pressure drop keeps your chiller energy use unchanged.
Do you offer calibration certificates traceable to ISO 17025?
We provide factory calibration certificates with traceability to national standards. For formal ISO 17025 certificates, we partner with external accredited labs in China and Europe. Additional cost is around USD 200 per meter. Most industrial chiller networks accept our standard certificate.
How do you handle refrigerant compatibility with elastomers in the meter?
We use FKM (Viton) or EPDM seals depending on the refrigerant. For example, R134a uses FKM; ammonia needs EPDM. We select materials based on your refrigerant and temperature, so there is no swell or leak after years of operation.
Can I use a single meter to measure both refrigerant and oil mixture in a chiller?
If oil fraction is below 3% by mass, the kg/h reading remains accurate within 1%. For heavy oil circulation, we recommend a separate oil flow meter and a mass balance. We have supplied dual-meter setups to ammonia chillers in a cold storage in Mexico.