We offer the widest product range of low-flow mass flow meters 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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Bronkhorst instruments are used for numerous applications in many different markets. In this section you will find an overview of the main markets for our equipment, illustrated with some typical examples of applications.
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.
Flow control is indispensable in biological, chemical, food and manufacturing processes or for analytical purposes. In these process applications, it is obviously necessary to supply fluids (gases, liquids or vapours) in a controlled way - which is essentially the definition of flow control. Accurate flow control will improve final product quality, improve process understanding by investigating varying process flows and may speed up process steps. Ultimately, the flow control will improve process economics. To this end, flow control devices or ‘flow controllers’ are used.
A flow controller adds one or more chemical compounds in gaseous, vapour or liquid form to a process by controlling the compound’s flow rate. This can either be a mass flow rate, expressed in grams of compound per minute, or a volumetric flow rate expressed in litres per hour.
Mass flow rate and volumetric flow rate are related to each other via the temperature and pressure dependent density of the compound and can thus be converted into each other. In many research and production processes, mass flow is preferred over volumetric flow control because mass and not volume is the important variable. However, many users think and work in units of volume, which is where volumetric flow controllers come in.
A flow controller is a flow meter combined with a control valve and control firmware. The flow meter measures the flow rate of the compound that is supplied to the process. If this measured value deviates from the setpoint value – the desired flow rate of the compound to be added – then the control valve is opened or closed to such an extent that the actual (measured) flow rate will eventually reach the setpoint value.
To explain how a flow controller operates, the main components of a Bronkhorst EL-FLOW mass flow controller are shown in the figure. The laminar flow element inside the body guides part of the fluid flow to the sensor which measures the flow rate. The control valve, positioned in series with this flow measurement part of the device, will vary the size of the flow passage by opening or closing, matching actual flow to setpoint. The pc-board inside the enclosure houses the control and feedback software between flow meter and valve.
Have a look at our blog 'Which control valve to use for your flow meter' to see how control valves can be an integral part of the flow controller device, or how they can be a separate component in combination with the flow meter. Directly coupled electromagnetically operated control valves are fast, low cost and use very little power to control the flow. To handle higher pressures and flows, redesigned (somewhat larger) direct valves or indirect control valve configurations are available.
The sensor type largely determines the kinds of flow controllers that are available.
To investigate the storage of hydrogen in metal hydride containers, the German Aerospace Center wanted a solution for the controlled introduction of hydrogen gas into the container. Devices from the IN-FLOW flow meter series in combination with Vary-P valves did the trick. To control the pressure in the metal hydride container, pressure controllers from the IN-PRESS series were used, connected to Vary-P valves. Read more...
For ice cream production, the aeration process is essential. Here, air is blended into a liquid mixture of various food ingredients. For the right final product consistency and structure, the ice cream must contain the correct amount of air bubbles. To this end, aeration mixer manufacturers use EL-FLOW Select mass flow controllers to dose an exact amount of air into the cooled mixer. Read more...
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®!