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.
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.
How does the accurate measurement of low gas and liquid flows relate to the Coriolis effect? This phenomenon is well known in meteorology on a world scale. Learn how the largest and smallest flows rely on the same phenomenon.
The video explains the Coriolis flow meter working principle
Ever wondered why wind in the Northern hemisphere mainly blows in a west/east direction during a low-pressure system?
The answer lies in the Earth’s rotation on its axis – mainly in east/west direction and at a higher speed at the equator than at the poles. This rotation takes the wind along and forces it to blow mainly in a west to east direction in the Northern hemisphere. It was the French scientist Gaspard-Gustave de Coriolis who discovered the effect that flowing air experiences a lateral force, which was named after him – the Coriolis effect. The first take home message is: the Coriolis effect explains the deflection of flowing air moving in a rotating system. In fact, the Coriolis effect is a mass inertia effect.
This Coriolis effect is also applied to a more ‘down to earth’ application: in mass flow measurement of gases and liquids. To this end, the fluid to be measured is forced to flow through a vibrating tube.
In the Coriolis flow device, an actuator allows a small tube to vibrate continuously around its natural frequency. Two sensors positioned along the tube measure the deflection of this vibrating tube in time. Without a fluid flowing through the tube, both sensors measure the same deflection at the same moment in time. However, when a gas or liquid flows through the tube, the mass of this fluid poses an additional twist to the tube due to the fluid’s inertia. The difference between the two, known as the ‘phase shift’, is a direct measure of the mass flow through the tube. This phase shift is proportional to the mass flow rate: a larger phase shift is the result of a higher mass flow rate.
Mass flow devices according to the Coriolis effect do even more – they measure fluid density! While phase shift is a measure for mass flow rate, the vibration (natural) frequency is a measure for fluid density. The density of a fluid affects the vibration frequency of the tube: denser fluids vibrate with a lower frequency than less dense ones. So this vibration frequency is a direct measure of the density of the liquid or gas. Mass flow rate and density are measured independently of each other using the same device, illustrating the versatility of Coriolis flow meters.
Coriolis flow meters allow the direct measurement of mass flows. Direct mass flow measurement eliminates inaccuracies caused by the physical properties of fluids. Thermal flow meters, on the other hand, allow indirect measurement of mass flows.
Due to the way of measuring, there are fundamental differences between the two kinds of devices, which influence their typical applications.
A thermal mass flow meter employs the fluid’s heat capacity to measure the mass flow rate. With a heater and one or two temperature sensors in the heart of the device, the applied power for heating (with one sensor) or the temperature difference between the two sensors is directly proportional to the fluid mass flow rate. Thermal mass flow meters are mainly used for gases.
Because the Coriolis principle directly measures the mass flow, Coriolis flow meters can be used for both gases and liquids.
With Coriolis instruments, the sensor tube is set into vibration by an actuator. In the case of external vibrations of approximately the same frequency, this could interfere with the measurement.
Take trains in the surroundings, air conditioning or other machines in the building itself. Identifying these external vibration sources is a first step to minimising their effects. This can be done, for example, by moving the Coriolis flow meter to a less vulnerable place, by rotating the device, by using a (bigger) mass block, decoupling using dampers and/or flexible tubes.
A Coriolis-based mass flow meter is particularly suitable when you want to measure the mass flow of varying or unknown gas or liquid mixtures or for measuring supercritical gases. Besides measuring direct mass flows which eliminates inaccuracies due to the physical properties of the fluid, these devices are highly accurate and have a high repeatability. The Coriolis flow meter is the ultimate flexible, reliable and extremely accurate flow meter.
Pump control is used in the production of homecare products. Read more about liquid dosing using pump control for a stable pump speed.
Flow Meters can help you improve your metering pump performance. Read our tips how to use Flow Meters in combination with your metering pump.
The Coriolis measuring principle is somewhat sensitive to unwanted vibrations with a frequency close to the resonance frequency of the sensor tube or a higher harmonic of this frequency. What can you do?
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®!