German DR NEUMANN sensors, DR NEUMANN models, DR NEUMANN prices

DR NEUMANN sensors are devices or assemblies that detect pressure signals and convert them into usable output electrical signals according to a defined pattern. Pressure sensors typically consist of a pressure-sensitive element and a signal processing unit. Depending on the type of pressure measured, pressure sensors can be classified as gauge pressure sensors, differential pressure sensors, and absolute pressure sensors. Pressure sensors are among the most commonly used sensors in industrial practice, widely applied in various industrial automation environments, including water conservancy and hydropower, railway transportation, smart buildings, production process control, aerospace, military industry, petrochemicals, oil wells, electric power, ships, machine tools, pipelines, and many other sectors.

DR NEUMANN sensor features

Currently, baffles can be designed based on water flow rate to reduce water resistance generated as water passes through the flow sensor, thereby minimizing head loss in the water system. However, baffles subjected to long-term water impact still face fatigue issues; even factory-calibrated flow values may experience setpoint drift. They are typically used where precise protection of flow values is not required, i.e., for break-flow protection against sudden interruptions in water pipes. In China, very few such devices are specifically designed for water-source heat pump units. The baffle type is specifically developed for water flow monitoring in water-loop/ground-source heat pump air conditioning units. It is equipped with different baffles for different pipe diameters, with each baffle causing a water resistance not exceeding 0.5 meters of water column, significantly lower than that of target-type sensors. Each baffle-type flow sensor comes with pipe fittings identical to those of the water-loop heat pump unit's water pipes. On-site installation only requires connecting to the water pipe without any modification to the baffle. Additionally, the baffle-type flow switch has a pressure rating greater than 25bar, making it a low-cost flow switch for water-loop heat pump units with less stringent flow requirements. Feedback from use in water-loop/ground-source heat pump units indicates that differential pressure switches can effectively identify issues in the on-site installed water piping of water-loop heat pump units, completely preventing heat exchanger freeze-up due to low water flow. Flow sensors can also protect against heat exchanger freeze-up caused by reduced water flow due to clogged water filters. Furthermore, water pipe differential pressure switches do not carry the risk of fatigue failure associated with target flow switches. Especially when there is a small amount of air in the water pipes, the flow sensor operates very stably without the floating issues seen in target flow switches. Years of feedback have not revealed any failures of the differential pressure switch itself.

DR NEUMANN sensor principle

Basic principles and types of ultrasonic flowmeters: When ultrasonic waves propagate in a flowing fluid, they carry information about the fluid's flow velocity. Therefore, the fluid's flow velocity can be detected by receiving the ultrasonic waves, which is then converted into flow rate. Depending on the detection method, ultrasonic flowmeters can be classified into different types, such as transit-time difference method, Doppler method, beam deflection method, noise method, and correlation method. Ultrasonic flowmeters are non-contact instruments that have come into application only in the last decade or so with the rapid development of integrated circuit technology. They are suitable for measuring fluids that are difficult to contact and observe, as well as large-diameter pipe flows. Linked with level gauges, they can measure flow in open channels. Using ultrasonic flow measurement eliminates the need to install measuring elements in the fluid, thus not altering the fluid's flow state or generating additional resistance. Instrument installation and maintenance do not affect the operation of production pipelines, making it an ideal energy-saving flowmeter. Industrial flow measurement commonly faces difficulties in measuring large pipe diameters and high flow rates. This is because general flowmeters encounter manufacturing and transportation difficulties as the measurement pipe diameter increases, leading to higher costs, greater energy loss, and installation challenges. Ultrasonic flowmeters avoid all these drawbacks. Since various ultrasonic flowmeters can be installed externally for non-contact flow measurement, the instrument cost is basically independent of the measured pipe diameter. In contrast, the cost of other types of flowmeters increases substantially with diameter. Therefore, the larger the diameter, the more superior the cost-performance ratio of ultrasonic flowmeters compared to other types with similar functions. They are considered excellent instruments for large-diameter flow measurement. Doppler method ultrasonic flowmeters can measure two-phase media flow, making them suitable for measuring dirty flows such as sewage and wastewater. In power plants.

DR NEUMANN sensor selection

When selecting flow sensors, users should choose suitable sensors based on their own needs. Many users have different requirements for the sensors they use, so the selected standards vary. If highly professional data and results are needed, national standards should be adopted. However, if the sensor is only used as a simple instrument within an enterprise for rough analysis, enterprise standards can be selected. When purchasing flow sensors, careful consideration is essential, and one should choose sensors with guaranteed quality and good usability. Many people assume that new sensors necessarily have higher technology, which is a one-sided view. New products must possess mature technology to be considered good products. In many economic sectors, accurate flow measurement has become extremely important. Nowadays, sensors are basically used to measure flow quantities. Sensors detect fluid flow and convert it into usable output signals; installing sensors makes operation simpler and more convenient. The quantity of flowing objects passing through per unit time is called flow rate. Different flow sensors are used for different objects, often distinguished by the measured medium and the measurement method. Flow sensors are generally used for the flow of media fluids in industrial pipelines. Under normal circumstances, there are various media such as gases, liquids, and steam. Several types of flow sensors can be universal for these various media types. The first is the vortex flow sensor. Another type is the ultrasonic flow sensor. With the development of ultrasonic technology, ultrasonic flow sensors can generally measure the flow of most flowing objects. Ultrasonic flow sensors have various measurement methods, each with its own characteristics. Selection should be based on factors such as the properties of the measured fluid, flow velocity distribution, pipeline installation location, and accuracy requirements. Since industrial flow measurement commonly faces difficulties in measuring large pipe diameters and high flow rates—because general flow sensors encounter manufacturing and transportation difficulties as the measurement pipe diameter increases, leading to higher costs, greater energy loss, and installation challenges—ultrasonic flowmeters avoid all these drawbacks. The flow measurement accuracy of ultrasonic flow sensors is hardly affected by parameters such as the temperature, pressure, viscosity, and density of the measured fluid. They can also be made into non-contact and portable measuring instruments, thus solving flow measurement problems for strongly corrosive, non-conductive, radioactive, and flammable/explosive media that are difficult to measure with other types of instruments.

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