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Bronkhorst Mass Flow Controllers: High-Tech Microfluidic Gas Metrology Devices

Quick Answer: Bronkhorst mass flow controllers give precise gas flow control for microfluidic test systems, lab reactors, and small process skids. Silver Instruments supplies thermal mass flow meters and controllers with 4-20 mA HART or RS485 Modbus outputs for industrial users in Southeast Asia, Oceania, Latin America, Africa, and the Middle East. Send us your gas type, flow range in ln/min, pressure in bar, temperature in °C, and pipe size in DN for a quote.

Most engineers who work with gas dosing know the Bronkhorst brand. The devices appear on many laboratory benches and pilot plant skids. A capillary thermal sensor sits inside the flow path. Most of the gas goes through a laminar flow element. A small portion enters the sensor capillary. The electronics measure a temperature difference. That signal becomes a mass flow reading. This method does not need pressure or temperature compensation. That matters a lot in microfluidic gas metrology.

In practice a Bronkhorst mass flow controller can handle ranges from 0.014 ln/min to over 1000 ln/min. Accuracy is often stated as ±0.5 percent of reading plus ±0.1 percent of full scale. Repeatability stays below 0.2 percent of reading. Response time can be under 1 second. Wetted materials include 316 stainless steel, aluminum, PEEK, and Viton. Pressure ratings reach 64 bar on some units. Process temperature range is 0 to 50 °C. Power is usually 24 Vdc. Output options include 4-20 mA, 0-5 Vdc, RS232, Modbus RTU, and PROFIBUS DP. These are the numbers engineers check first.

Where Microfluidic Gas Metrology Devices Are Used

Fuel cell test benches control hydrogen flow from 0.2 to 2 ln/min. Plasma coating systems need argon or oxygen at low flow. Gas chromatography supplies carrier gas at 0.5 to 5 ln/min. A leak test rig in Vietnam may use 0 to 10 ln/min of air. A microreactor pilot plant in Mexico may dose nitrogen at 0.1 ln/min. Those applications cannot accept unstable flow. A small drift in gas flow changes reaction time or detector response. So users pay for repeatable thermal mass flow controllers.

Here is the thing. Bronkhorst controllers are not cheap. A single lab unit with digital communication can cost more than many small OEM budgets allow. Lead times from Europe can stretch to 8 weeks or more. For process engineers in Indonesia, Nigeria, or Chile, that delay can stall a project. Silver Automation Instruments supplies thermal mass flow meters and controllers as a practical alternative. Our devices cover gas flow from 0.1 ln/min to 100 Nm3/h. They include local display, 4-20 mA HART, RS485 Modbus, and alarm relay outputs. Some models support ATEX Zone 1 for gas environments. Wetted parts come in 316L stainless steel. For liquid process lines we also supply Coriolis, electromagnetic, ultrasonic, vortex, and oval gear flow meters.

We have seen this on customer sites many times. Last year a customer in Vietnam asked us for a 0 to 10 ln/min air mass flow controller for a leak test rig. He had specified a Bronkhorst unit with 4-20 mA and RS232. We supplied a Silver Instruments thermal mass flow meter with 4-20 mA HART and local display. The lead time was shorter. The price was about 40 percent lower. The system passed site calibration. That kind of swap only works when the process data is clear. Send us your gas type, flow range in ln/min, pressure in bar, temperature in °C, pipe size in DN, and communication protocol. We will check compatibility before quoting.

For microfluidic gas metrology devices, material compatibility matters. Check the elastomers. Viton and Kalrez are common. For hydrogen service do not use standard aluminum. Specify 316L stainless steel. For aggressive gases use a purge or a sealed capillary. The PT100 sensor inside the thermal mass flow meter is not wetted in most designs. That keeps maintenance low. If your process g