We offer the widest product range of low-flow (mass) flow meters and controllers on the market. Numerous styles of both standard and bespoke instruments can be offered for applications in laboratory, machinery, industry and hazardous areas.
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Learn more about how Coriolis-based flow meters can be used as microfluidic flow meter instead of thermal flow meters. Read the customer story of a microfluidics system builder who used Bronkhorst products.
Are you looking for technical documentation, are you interested to learn more about the measuring principles of Bronkhorst products, or you do want to get in contact with a Bronkhorst Service Engineer? This section will guide you to the relevant service & support topics.
Bronkhorst High-Tech BV the leaders in Mass Flow Meter / Mass Flow Controller technology for gases and liquids, Pressure Controllers and Evaporation Systems.
For thermal liquid flow measurement we distinguish two inline measuring principles:
Thermal mass flow sensors for liquids using the CTA principle do not have the probes you see at the sensors suitable for gases. In case of liquid Mass Flow Meters the sensor is built around a stainless steel tube without any moving part or obstructions.
The heater/sensor assembly is arranged around the tube and, by following CTA principle, a constant difference in temperature (ΔT) is created. In this case, the first element acts as temperature sensor, and the second element acts as a heater, as shown in figure A. The heater is heated to a certain constant temperature difference (ΔT) over the medium temperature. The actual mass flow rate is calculated by measuring the variable power required to maintain this constant temperature difference as the liquid flows passes the sensor.
For example the Bronkhorst LIQUI-FLOW™ Series L10/L20 uses this principle. Due to the benefits of the unique patented sensor, the fluid will be warmed to a maximum of 5°C, thereby making this Mass Flow Meter suitable for fluids with low boiling points.
The principle of CPA can be compared with CTA. However, in this case, the two elements are used both as heater and as temperature sensor, as shown in figure B. Both elements are provided with an equal amount of constant power, the temperature difference (ΔT) between them is a measure for the flow.
Liquid flow control can be achieved by integrating a control valve onto the body of the liquid Flow Meter (Liquid Flow Controller) or by applying a separate, close-coupled control valve. Bronkhorst liquid flow control valves have a purge connection to eliminate air or gas during start-up. The electronic control function forms part of the normal circuitry of Bronkhorst liquid Flow Meters.