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.
Do you know what aspects you should take into consideration when selecting a flow meter for the current project you are working on?
Before you can start conducting experiments or developing skids for your customers, it is essential that your research setup or your system is working properly. A key component herein is often a flow meter. This can be a gas, liquid or vapour instrument. To select the right flow meter, you must follow some steps to make your choice. We will guide you along your way of making the best selection. Of course, there is a big difference between lab and industrial applications but most of the considerations are required for both application fields.
But first, let’s explain a bit more about what flow meters are, how they work, what they are used for and the criteria to select the best flow meter for the application.
A flow meter is an instrument that measures a mass or volumetric flow rate of a gas or liquid. You might have come across a variety of terms when referring to a flow meter, such as flow sensor, mass flow meter, mass flow controller, flow regulator etc. The purpose of a flow meter basically is measuring the flow of gas or liquid between two points in a process. Sometimes controlling or regulating the flow is necessary. This is done by combining a flow meter with a valve, creating a flow controller. In this case, besides measuring a flow, you can also control it to change the flow rate. The output can help you understand your process better to make decisions regarding product quality, speed of process and cost reduction.
There are two basic types of fluid measurement – volume and mass flow measurement. The volumetric flow measurement is temperature and pressure dependent and will be shown in units of volume such as ml/min or m3/h. When measuring mass flow, you see units of mass such as kg/h or g/min. Alternatively, mass flow can be expressed as standardized volumes e.g. mls/min or m3n/h. Therefore, you can either choose for a volumetric flow meter or a mass flow meter for your application. Besides these two types of measurement, there are different measuring principles that all have their specific advantages and disadvantages.
In this paragraph we will discuss some of the essential elements that go into the decision-making process of selecting a flow meter. Thereby, we consider the differences between various measurement principles. Read below what to think of when selecting a flow meter.
Chemical and physical properties of the medium can influence the material of the flow meter and therefore the working of the instrument. Commonly, the following wetted parts (parts that are exposed to or in direct contact with the medium) may be offered:
The flow rate is usually the most important specification to consider when selecting a flow meter. Fluid quantity can be displayed in volume, standardized volume and true mass units. The flow rate is the quantity of fluid per unit time flowing through a measuring device.
Check out the blog to find out why it is important to know what reference conditions you are working with. A supplier usually indicates the minimum and maximum full scale range of a product series. This should meet your process requirements.
When selecting a flow meter, it is important to know if you need a low pressure drop or not. The pressure drop is defined as the difference between the inlet and the outlet pressure. Next to this, flow meters have a maximum operating pressure. If you have a high-pressure application, you need to take this pressure rating into consideration.
In case of mass flow control, the inlet pressure (P1) and outlet pressure (P2) are required for selection and dimensioning of the most appropriate control valve.
The temperature of your fluid and of the instrument’s environment are the next topics on the list to check.
Variations in fluid temperature may affect the accuracy of your measurement. In case of temperature fluctuations, it could be interesting to select a flow meter with temperature compensation (e.g. the EL-FLOW Prestige flow meters).
Too high or too low environment temperatures may also harm the electronic components of your flow meter during operation or storage. When you use a flow meter in a furnace of burner application, or in areas with very low temperatures, it is important to check whether the instrument can withstand these extreme temperatures. Therefore, check the temperature specifications as provided by the supplier before selecting your flow meter.
When selecting your flow meter, you must consider where you install it. Whether it is indoors, outdoors, in a laboratory or for a particular industry. For laboratories other specifications are applicable than for the oil and gas industry.
When selecting your flow meter, you need to think of what is important in your process. What do you want to achieve?
The specifications of the flow meter must be taken into consideration when selecting a flow meter. Accuracy and repeatability are important specs to look at.
Accuracy is how close the measurement is to the true value. For flow meters, the measured deviations are often visualised on a calibration certificate. This is expressed as a percentage, e.g., ±1%. Not all flow meters offer the same accuracy; however, not all applications require the highest possible accuracy. Nevertheless, absolute accuracy is important in quantitative research and development or catalytic applications.
Repeatability is producing the same outcome given the same conditions. In other words, a flow meter should produce the same readings when operated under the same variables and conditions. This, too, is expressed as a ± percentage. This is, for example, especially important for burner applications.
Sometimes it makes sense to select a flow meter that can be used in multiple applications. For instance, when you need an instrument in a research project and you know that other projects will follow in the future, but you have no idea what fluids are used then. In cases like this, it can be beneficial to select a flow meter that is fluid independent and has a wide flow range as well.
In the food and beverage and pharmaceutical industry, cleaning your instrumentation is important to avoid cross contamination. Clean-in-place (CIP) is a method of cleaning the interior surfaces of pipes, vessels, equipment, filters, and fittings. A typical CIP cycle consists of various steps including washing with a hot cleaning agent and hot acid with temperatures up to 95°C. Steam-in-place, also referred to as sterilization-in-place (SIP), consists of a phase in which the instrument is sterilized with saturated steam with a temperature up to 140 °C. Not all flow meters are suitable for these cleaning methods, so it’s an important factor to consider when applicable. Please also note that these markets often require the application of FDA approved seals as well.
Is space limited in your process? Then select a flow meter that is compact and does not require a straight run of pipe at the inlet or outlet. There are ultra compact flow meters on the market based on MEMS technology (e.g. the IQ+FLOW gas flow meter).
Mounting of the flow meter
Before selecting a flow meter it is essential to check where to locate and how to position the instrument in your installation. The accuracy of some instruments is more affected by its mounting position than others. Other relevant aspects with respect to the mounting of flow meters may be disturbances caused by vibrations, crosstalk, pressure shocks and the effects of bends, valves and reductions of pipe diameters up- and downstream of the instruments. These effects may also vary per operating principle.
Type of communication
Check whether you need a digital or analog flow meter. Besides that, you need to know what type of communication is used in your process. Popular types of fieldbus communication are Profinet, EtherCAT, CANopen, Ethernet/IP and POWERLINK but also the more established versions such as Modbus, Profibus and DeviceNet can be integrated. There is also the possibility of using a manufacturer's own fieldbus communication, such as Bronkhorst's FLOW-BUS. This has the advantage of a simple and cost-effective network setup that can be transferred to common interfaces such as RS232, Profinet and Profibus.
Some flow meters are more sensitive to moisture or particles than others. Appropriate filtering to protect your instruments may be a good investment, saving costs for cleaning, repair, interruption of your process and possibly also the waste of raw material or finished product.
Flow meters are used in a wide variety of applications; here are some examples:
When you install a mass flow meter or controller it is important that you get the best performance from the moment you install and turn it on. Check out our top 10 tips for installation of thermal mass flow meters and controllers.
Thermal mass flow meters are used to measure mass flow of low gas flow. A mass flow controller is a flow meter combined with a control valve.
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Do you need help selecting a flow meter? We can help you.