GRX-Q - Flow measurement

The flow measurement is part of the metrological determination of a volume flow Q or mass flow m=ρ∙Q. This is done as a function of a measuring cross-section A of a closed pipe or an open channel.

Flow measurement can be carried out on any fluids, such as cooling lubricants, and is used in a wide variety of areas. Depending on the measuring and evaluation method, flow meters are used in power and work machines, disposal technology, process engineering, chemical production processes and air conditioning and ventilation technology. Another area is the monitoring, control and regulation of coolant and lubricant circuits on CNC machines for machining, for example.

A distinction is made between two measuring methods. On the one hand, there are direct measuring methods, in which only a single measured variable is required to determine the flow rate. On the other hand, there are indirect measuring methods in which one or more additional variables must be known or measured in addition to the main measured variable.

Flow and volume measuring devices can be divided into two main groups. The first main group consists of flow meters for open channels, while the second main group consists of flow and volume meters for closed pipelines.

In this paper, only measuring devices for closed pipes are considered and described below.
In particular, the flow meters (DFM) relevant for a grinding process are discussed.
An overview of the sensors is listed in Table 2-4.