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HPLC Flow Meter: High-Pressure Liquid Chromatography Calibration
Quick Answer: Silver Automation Instruments supplies high-pressure liquid flow meters for HPLC pump calibration. We use Coriolis mass flow technology to measure actual mass flow in g/min at pressures up to 400 bar. This direct mass measurement eliminates the errors of timed volume methods, speeding up calibration routines in pharmaceutical and chemical labs.
Why HPLC Pump Calibration Needs a Better Reference
HPLC systems in quality control and R&D labs rely on accurate solvent delivery. Pump flow rates typically range from 0.1 mL/min to 10 mL/min at back pressures of 100 to 400 bar. A small error in flow changes retention times and peak areas. Most labs still use a graduated cylinder and a stopwatch. This manual method introduces meniscus reading errors, requires degassing, and does not account for solvent density changes with temperature. During a recent service call, a customer in Thailand told us they spent 45 minutes calibrating one pump with the cylinder method. After switching to an inline mass flow meter, the same job took under 5 minutes. That is the kind of efficiency gain that pays back the meter fast.
Coriolis Mass Flow Meter for HPLC Calibration
Our SIL-CMF-M series Coriolis mass flow meters are designed for low flow liquid applications. Key specifications for HPLC calibration:
Flow range: 0.01 g/min to 200 g/min (equivalent to 0.01 mL/min to 200 mL/min for water-like solvents)
Pressure rating: up to 414 bar (6000 psi) with all-welded 316L stainless steel sensor
Accuracy: ±0.1% of rate for liquids above 0.2 g/min
Wetted materials: 316L stainless steel, optional Hastelloy C-22 for acidic mobile phases
Process connections: 1/16 inch compression fitting adapters available for HPLC tubing
Outputs: 4-20 mA HART, RS485 Modbus, and pulse output for data acquisition
Temperature compensation: integrated PT100 sensor reports live density and temperature
How the Calibration Setup Works
Install the flow meter directly after the pump, before the injection valve. Remove the column and connect the meter outlet to a back-pressure regulator or simply restrict the line to generate system pressure. Start the pump at a set flow rate, allow the reading to stabilize, and record the mass flow. Because Coriolis meters measure mass flow directly, you do not need to correct for solvent density. The meter reports density in real time, so you can also spot degassing issues or solvent mixing problems. A technician at a vaccine production site in Brazil noticed their mob
Choosing Between Coriolis and Other Technologies
Thermal mass flow meters work for clean gases but face challenges with liquid HPLC solvents because of varying heat capacities. Turbine and gear meters add pressure drop and risk contamination. Ultrasonic non-invasive meters lack the needed low-flow accuracy for HPLC. In practice, Coriolis is the best fit for direct mass flow measurement in this application. Silver Instruments also offers oval gear flow meters for higher-viscosity fluids, but for HPLC mobile phases like acetonitrile, methanol, and water, the SIL-CMF-M series is the workhorse.
Frequently Asked Questions
Can I use a Coriolis meter with gradient HPLC? Yes. The meter measures actual mass flow, so changing solvent ratios during a gradient is no problem. You will see the mass flow rate in real time, regardless of composition.
What is the smallest flow rate you can measure accurately? The SIL-CMF-M sensor reads down to 0.01 g/min with a turndown of 100:1. At 0.01 g/min, accuracy is ±0.2% of reading. For typical HPLC flow of 0.5 to 2 mL/min, accuracy is ±0.1%.
How often does the meter need recalibration? We recommend an annual calibration check. The meter stores factory calibration coefficients. You can verify with a known mass of liquid or send it to our service center in Nanjing. Many pharmaceutical sites do an in-house verification every 6 months using a precision balance and a timed collection, but the Coriolis meter itself holds calibration for years.
Can the meter handle acetonitrile and methanol? Standard wetted parts are 316L stainless steel and are compatible with common HPLC solvents. For corrosive additives like trifluoroacetic acid, specify Hastelloy C-22. The meter body has no moving parts that can swell or leak.
How do I connect the meter to 1/16 inch HPLC tubing? We supply stainless steel compression adapters from the meter process connections to 1/16 inch OD tubing. The internal volume of the meter is about 0.15 mL, adding minimal gradient delay.
Request a Quote for Your HPLC Calibration Flow Meter
Tell us your pump flow range (mL/min), operating pressure (bar), mobile phase composition, and connection size. Our engineers will select the right meter and adapters from our SIL-CMF-M series. Contact Silver Automation Instruments today.
Email: [email protected]
Tel: +86-135-1213-1526
Whatsapp: 86-135-12131526
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