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35 ml/min Flow Meter Laboratory Analytical Benchmarks
Quick Answer: A 35 ml/min lab flow meter must give repeatable mass flow data without density or heat capacity compensation. Silver Instruments micro Coriolis meters achieve plus or minus 0.1 percent of rate accuracy at 35 ml/min for solvents, water, and low-viscosity liquids. You get direct mass flow readout, a 100:1 turndown, and a 4-20 mA HART signal ready for your DAQ system.
Why a 35 ml/min Benchmark Covers Many Lab Setups
Laboratory reactors, HPLC fraction collectors, microchannel catalyst test units, and continuous flow synthesis rigs all converge on the 30 to 40 ml/min range. At 35 ml/min a small offset of 0.5 ml/min ruins a 24-hour material balance. Peristaltic pump calibration with a stopwatch and a graduated cylinder works in open beakers. Once you pressurise the line to 10 bar and raise the solvent temperature to 60 degrees Celsius, that method drifts. You need an inline meter that gives mass flow directly, because the density of acetone at 60 degrees Celsius differs enough from room temperature to add volume error. Silver Automation Instruments gets this request almost weekly from research groups in Australia and Singapore.
Micro Coriolis Benchmarks at 35 ml/min: SL-CMF-015 Data
Our SL-CMF-015 micro Coriolis mass flow meter has a liquid range of 0.01 kg per hour to 2.0 kg per hour. For water at 20 degrees C, 35 ml/min equals close to 2.1 kg/h. That places your flow point right in the sweet spot of the sensor, where factory calibration yields plus or minus 0.1 percent of rate accuracy and plus or minus 0.05 percent repeatability. The pressure drop at this rate is under 0.2 bar with a single straight tube design that handles slurries up to 200 cP without clogging. The meter body is full 316L stainless steel with Hastelloy C-22 wetted parts as an option. Process connections are standard 1/16 inch compression fittings you already use on your HPLC and Swagelok tube runs. Turndown is 200:1, so the same unit can validate a 0.2 ml/min tracer injection and a 40 ml/min main feed.
Coriolis vs Thermal Mass at Low Liquid Flows
Some labs start with a thermal mass flow meter for liquid because the price tag looks lower. Here is the thing: thermal mass liquid meters rely on the fluid heat capacity and thermal conductivity. If your mobile phase changes from pure water to 30 percent methanol, the meter reads wrong until you reprogram the heat capacity factor. A Coriolis meter ignores fluid properties altogether. It measures true mass flow by tube oscillation. A lab in Vietnam we worked with last year runs five different solvent mixtures through the same microreactor. They tested both technologies. The thermal unit needed eight recalibrations in one month. The SL-CMF-015 stayed within specification without any adjustment. They now use it as their in-house reference standard for flow benchmarking.
Output Signals and Lab Data Integration
Typical lab DAQ systems expect 4-20 mA HART, RS485 Modbus RTU, or a frequency pulse. Silver Instruments configures each micro Coriolis transmitter to deliver all three simultaneously. You can log mass flow, density, and temperature over Modbus at 10 Hz. The onboard PT100 temperature sensor is accurate to plus or minus 0.2 degrees Celsius, which is enough to correct any minor density effects when you report volumetric flow at standard conditions. For Zone 1 ATEX areas in hydrogenation labs, we supply an intrinsically safe version with an isolating barrier. Because most analytical labs keep the meter inside a ventila
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Real Installation Notes from Customer Sites
A paint manufacturer in Southeast Asia uses 35 ml/min of catalyst slurry with 15 cP viscosity. Their previous turbine meter clogged every two days and required disassembly. They replaced it with the straight-tube SL-CMF-015. After six months, drift check with a scale showed a deviation under 0.08 percent. Another customer, an amine scrubbing research lab in Perth, measures 35 ml/min of potassium carbonate solution at 80 degrees Celsius. They mounted the meter vertically with upward flow to ensure full tube fill and avoid gas bubbles. Both sites use a 150 micron inline filter upstream as belt-and-braces protection, even though the sensor tube bore is 1.2 mm and passes small particles without blocking. Most engineers skip this part, but if your slurry has irregular agglomerates, a simple Y-strainer saves you a weekend call-out.
How to Specify a 35 ml/min Meter for Lab Analytical Benchmarks
Send us your fluid name, viscosity in cP, operating temperature in degrees Celsius, inlet pressure in bar, and pipe connection size. We recommend also noting the presence of any abrasive solids or strong acids. Our team then confirms the wetted material compatibility, calculates the pressure drop at your flow rate, and proposes the exact transmitter configuration. Silver Automation Instruments supplies a 5-point NIST-traceable calibration certificate with every meter, covering the range that includes 35 ml/min. Turnaround from order to dispatch is usually 12 working days for standard units. For aggressive solvents like THF or methylene chloride, we specify Kalrez O-rings and advise on cleaning procedures. This avoids rubber swelling that ruins the zero stability in cheaper generic O-rings.
Key FAQ for 35 ml/min Lab Flow Meter Applications
Can the same micro Coriolis meter handle gas at 35 ml/min?
Yes, the SL-CMF-015 measures gas mass flow from 0.005 kg per hour up to 0.5 kg per hour. For nitrogen at 2 bar gauge, 35 ml/min corresponds to about 0.05 kg per hour, which sits well inside the calibrated span. The accuracy drops slightly to plus or minus 0.5 percent of rate for gas, which is still fine for catalyst screening rigs.
Do I need a density option if I only want mass flow?
You do not need density for mass flow, but the onboard density measurement acts as a built-in concentration check. Many analytical labs use it to verify that the solvent mixture ratio has not drifted, which saves a separate inline densitometer.
What warm-up time does the meter need before a test run?
The meter reaches a stable zero within 15 minutes. In practice, labs power it up at the same time as the recirculating bath, and by the time the reactor reaches thermal steady state the meter is ready.
Can I use the same instrument with capillary 1/32 inch tubing?
We offer a reduced-bore adapter that steps down from the 1/16 inch compression fitting to 1/32 inch capillary. The additional pressure drop is under 0.1 bar at 35 ml/min for water. You may need this for microfluidic chips with limited swept volume.
How do I get a quote and a detailed performance curve?
Send us your pressure in bar, temperature in degrees Celsius, pipe size in DN, and flow range. Include the fluid name and any solids loading. We return a quotation with a calculated pressure drop curve, accuracy plot, and lead time. Ask for a remote demo video of a 35 ml/min water run if you want to see real-time stability before committing.