Cover Image

Customers over the world are searching for simplication and integration of their gas, liquid or vapour flow processes. They prefer integrated platforms that are compact, robust and reliable, and even containing different type of sensors.

In this blog I provide a sneak-preview of the ‘toolbox’ which is under development at Bronkhorst High-Tech B.V. One of the components which we are working on, a micro Coriolis mass flow sensor, is already shared with you in our previous blog ‘Miniaturization to the extreme’.

Why do we develop a next-generation toolbox?

On a daily base, our customers tell us their need for miniaturization and the need to control a complex set of different parameters to meet the stringent demands of their customers. These types of customers include the life-science market, analytical device manufactures but also markets in which online gas-concentration levels are measured.

MEMS based technology

These types of requests triggered us to work on the next level of sensor development which can support the future need of our customers. This new development includes MEMS based technology (Micro Electro Mechanical System) which gives you the possibility to measure more than just flow alone on one customized system that can consist of one or a combination of sensors.

Parameters

For instance, a measured physical property can be used to identify the type of medium, if that property is unique for that medium. Or, in case the medium consist of a mixture of 2 gasses, a property can be used to analyse the fraction of this binairy mixture.

Other parameters which can be thought of are the sugar content of a fluid, also referred to as the Brix number, or heat capacity that can be used to measure oil/water mixtures.

In short, these new concepts are under development to support our customers to solve their next generation technology challenges.

Multi-parameter sensor chip

An example of how a program was started to minimize the footprint; Bronkhorst received the request to measure fysical gas properties in combination with several partners. The fysical properties included the: • heat capacity (cp) • density (ρ) • thermal conductivity (λ) and • viscosity (η)

To analyze these properties several individual sensors like a Coriolis-, Thermal-, Pressure- and Density sensor were needed. To proof that the combination of several sensors in combination with electronics could meet the needs of the customer, a demonstation model was developed. This demonstration model contained commercially available products which where combined in one system.

Demonstration model

The learnings from the demonstration model support the project team to define the exact scope for the multiparameter chip alternative.

One important aspect of sensor performance is the stability, espacially when multiple sensors are combined to determine information about the medium in the system. In figure below it's shown that we can measure the viscosity with a combination of the massflow, density and differential pressure. With the demonstration model shown above we have tested if the viscosity of a medium can be measured accurately over longer periods independent of room temperature changes. The measurement of viscosity can be interesting for some applications, for instance with natural gas where viscicosity and calorific value are strongly correlated. The test results are shown bellow for a test period of 84 hours, the histogram shows that all measurements values for the viscosity fall within a band of 0.5 %.

Test results

The next level will be to combine the same functionalities on a much smaller footprint. The concept below shows the possibities to combine the required parameter on chip level.

Omnicorder

Bronkhorst® Flow Solutions

For machine builders all over the world who are searching for simplification and integration of their gas, liquid or vapour flow processes, Bronkhorst can already help in developing and supplying 100% customized flow solutions that fully meet the customer’s needs.

For information about our future toolbox concepts please contact our office sales@bronkhorst.co.uk

In several earlier blogs the results of this co-creation process has been addressed:

Miniaturization to the extreme: micro-Coriolis mass flow sensor.

• Bronkhorst, its share of a clean – solar – energy future: a collaboration between Tempress’ engineers and Bronkhorst

Customized low flow measurement skids and the four reasons why customized skids are popular