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.
Customer satisfaction, innovation and quality of product and service have been the cornerstones of Bronkhorst's success. Based on our experience, innovation and sense of responsibility, a relationship with Bronkhorst assures Performance for Life.
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.
The essence of fuel cells is that hydrogen and oxygen do not react with each other directly, but in an indirect and controlled way. These reactants are supplied to separate parts of the fuel cell, and they react with each other inside the fuel cell with water as reaction product and an electrical current as result, which can be fed to an electric motor of a vehicle.
To prevent a premature direct reaction of hydrogen and oxygen resulting in a lower performance of the fuel cell, there should be no short circuits leaks between the hydrogen and oxygen side, and each of the sides should not be blocked.
For car manufacturers it is important to work with high quality fuel cell stacks. Stacks are metal plates that are assembled in parallel to a fuel cell stack. The number of metal plates depends on the capacity. During the assembly, seals or other particles could have come between the plates, which is undesirable. Bronkhorst’s distributor, Wagner Mess- und Regeltechnik, helped a car manufacturer by supplying instruments able to perform such a quality control.
Part of the incoming quality process of our customer is to check the quality of the fuel cell. A value for an optimum flow resistance window needs to be defined, and by applying a gas flow and measuring a pressure increase or drop, the flow resistance can be quantified. A too low flow resistance is a measure for a leak, and a too high flow resistance for a partly blocked fuel cell. These tests need to be performed at the hydrogen as well as the oxygen side of the fuel cell.
The Bronkhorst solution consists of two flow/pressure combinations. The user can determine during the tests whether he would control the pressure and measure the flow or control the flow and measure the pressure. Both options are possible.
Each of the flow/pressure combinations is composed of an EL-FLOW Select gas mass flow controller for air or nitrogen, and an EL-PRESS pressure meter. One combination is connected to the oxygen - cathode - side of the fuel cell, and the other combination to the hydrogen - anode - side, so that the cathode and anode side are measured separately.
Filters are applied before the gas enters the flow/pressure system, in order to remove any solid particles that might be present in the gas flow. Both tests are performed in parallel, one time forward and one time backward.
Depending on the type and size of the fuel cell, the client defines a pressure/flow window. When the measurement results are inside this window, the fuel cell is approved. As part of the quality control requirements to approve or disapprove a fuel cell, the reproducibility of the test results is important.