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.
This inline principle uses CTA or Constant Temperature Anemometry. Another synonym for this inline measurement is ‘direct through-flow measurement’. And – as the name indicates – ‘inline’ means no bypass.
The Constant Temperature Anemometry - CTA - gas flow sensor consists of two stainless steel probes (‘metal pens’) which are positioned inline in the main gas flow channel, where gas is forced to flow along them. The first probe is a heater and the second one is a temperature sensor. A constant temperature difference (delta-T or ΔT) is created between the probes.
Regardless of the actual mass flow rate, Constant Temperature Anemometry aims to keep this temperature difference (ΔT) between both sensor probes at a constant level. The heater energy required to maintain this constant ΔT is proportional to the mass flow rate and is thus a measure of the mass flow of the gas. This proportionality factor depends on thermal properties of the gas such as its thermal conductivity and specific heat capacity, as well as its dynamic viscosity.
The higher the gas mass flow rate, the more energy that is required to maintain the chosen ΔT. The actual mass flow rate is calculated by measuring the variable power required to maintain this constant temperature difference as the gas flows along the sensor.
This principle stems from over a century ago, when the Canadian physicist and inventor of the hot-wire anemometer, Louis Vessot King, postulated the Law named after him (King’s Law) that describes heat loss of a hot-wire due to gas or liquid mass flow flowing along.
Amongst various flow measurement techniques, the thermal mass flow measurement based on the Constant Temperature Anemometry (CTA) principle is used for both gases and liquids. Mass flow meters based on the CTA principle cover a wide range of measurement and control applications in almost every industry sector.
An application with a slightly moist gas (humidity), or where lower accuracy but high repeatability and robustness is required, is a good application for flow controllers with a robust inline sensor in combination with a straight flow channel such as MASS-STREAM or MASS-VIEW devices. There are no narrow pipelines to clog with particles, so they can handle most gases.
Thermal mass flow meters are used to measure mass flow of low gas flow. A mass flow controller is a flow meter combined with a control valve.
Bronkhorst High-Tech designs and manufactures innovative instruments and subsystems for low-flow measurement and control for use in laboratories, machinery and industry. Driven by a strong sense of sustainability and with many years of experience, we offer an extensive range of (mass) flow meters and controllers for gases and liquids, based on thermal, Coriolis and ultrasonic measuring principles. Our global sales and service network provides local support in more than 40 countries. Discover Bronkhorst®!