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.
Bronkhorst supported a company specialised in gas mixers for gas analysers with a solution to prepare their own gas mixture to calibrate gas chromatographs.
Analysing instruments like gas chromatographs must be calibrated regularly. This way they can accurately determine the chemical composition of compounds. During calibration, the measurement values of the gas chromatographs are compared with a calibration standard that has a known accuracy. The values of the device are adjusted accordingly. For gas chromatographs, such a standard is a gas mixture with an accurately known composition.
For operators of gas chromatographs, there are two ways to generate these gas mixtures:
The customer was looking for low-cost mass flow controllers with various flow ranges to create gas mixtures with the option to communicate with the Modbus protocol. Their preparation method of calibration gas mixtures must comply with the ISO 6145-7 standard.
In this application gas mass flow controller of the EL-FLOW Base series are used. Up to 12 gas cylinders are connected to an equal amount of mass flow controllers. The accurately controlled gas flows enter a mixing chamber after which the mixture is fed to a gas chromatograph for calibration purposes.
The ISO 6145-7:2009 standard describes a procedure to prepare calibration gas mixtures using commercially available thermal mass flow controllers. The accuracy of the final gas composition that leaves the gas mixers is calculated by dedicated software that considers the uncertainties in the gas flows - due to the used mass flow controllers - as well as uncertainties in the gas composition of the initial gas cylinders.
Compared to the purchase of gas cylinders with pre-mixed gas mixtures, the preparation of gas mixtures on-site has some advantages. For example, the lifetime of pre-mixed gas mixtures can be limited. The costs for these pre-mixed gas mixtures are quite high, and you are not sure that the concentration of the gas is still good or that the mixture is still homogeneous.
Therefore, it can be interesting for users to prepare gas mixtures on their own with very low concentrations of specific compounds. Which yields the main argument for on-site gas preparation: as an operator you don't have to invest in cylinders of gas mixtures. It gives a lot of flexibility and freedom to calibrate an analyser in your own time.
The entire 'package' of good purchase price, improved accuracy and flexibility as well as the integrated Modbus protocol has been reason for the customer to choose for Bronkhorst devices.
An alternative for the EL-FLOW Base product line is the FLEXI-FLOW product line. If you need advice on the best possible solution for your process, ask our advice.
"The entire 'package' of good purchase price, improved accuracy and flexibility as well as the integrated Modbus protocol has been reason for us to choose for Bronkhorst devices."
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®!