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.
In thermal instruments based on the bypass principle, only part of the gas stream flows through the sensor (as shown in figure A). The gas stream through the sensor is warmed up by two heaters (RHT1 and RHT2). Accordingly, the temperature of the tube is measured at two points (T1 and T2).
With no flow measured, the temperature differential between the two points will be zero. When the flow increases, the temperature at the first measuring point (T1) will decrease, as fluid carries away the heat (as shown in figure B). At the same time the temperature at the second measuring point (T2) will increase as the fluid carries heat to it. More flow will result in a greater temperature differential and this temperature differential is directly proportional to the mass flow. Electrically, temperatures T1 and T2 are in fact temperature dependent resistors RHT1 and RHT2.
In figure A it is shown how the signals measured in the sensor are amplified to electric signals. The sensor is mounted as a bypass to the main channel, where a flow resistance splitter takes care of proportional flow division.
The patented laminar flow element (flow splitter) of Bronkhorst consists of a stack of stainless steel discs with high-precision etched flow channels, having similar characteristics as the flow sensor. For higher flow rates, the discs are equipped with an additional section to filter out turbulence effects. The perfect flow division of Bronkhorst flow splitters ensures stable and calculable flow proportioning, even under varying process conditions.
As a variant of the bypass principle described above, Bronkhorst designed a special construction for low pressure drop applications - the LOW-dP-FLOW series - the sensor only requires approx. 0,25...2,5 mbar. Furthermore, the larger flow channels minimize the riscs of clogging and facilitate cleaning and purging. Therefore this construction should be preferred for corrosive gas applications.
Do you know what the difference is between laminar flow and turbulent flow? Allard Overmeen, field service engineer, will explain it in the blog about turbulent flow.
Thermal mass flow instruments that make use of a bypass are what most people have in mind when they think of thermal mass flow instruments. What are the differences?
In many research and production processes the important variable is mass and not volume. Measurements of volumetric flow are not as reliable as mass flow measurement due to the effects that changes in temperature or pressure have on the density of a fixed volume of gas.