German SCHUNK sensors, SCHUNK models, SCHUNK pricing

SCHUNK 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 automation, aerospace, military industry, petrochemicals, oil wells, electric power, ships, machine tools, pipelines, and many other industries.

SCHUNK 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 reducing head loss in the water system. However, baffles subjected to long-term water impact still face fatigue issues; even if the flow value is calibrated at the factory, setpoint drift may occur. They are typically used where precise protection of flow values is not required, i.e., for break-flow protection against sudden interruption of water flow in pipes. In China, very few are designed specifically 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, and the water resistance of each baffle does not exceed 0.5 meters of water column, which is significantly lower than that of target-type sensors. Each baffle-type flow sensor is supplied 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 pressure rating of the baffle-type flow switch exceeds 25bar, making it a low-cost flow switch for water-loop heat pump units with less stringent water flow requirements. Feedback from use in water-loop/ground-source heat pump units indicates that differential pressure switches can effectively identify problems in the on-site installation of water piping for water-loop heat pump units, completely avoiding heat exchanger freeze-up caused by low water flow. Flow sensors can also protect against heat exchanger freeze-up due to reduced water flow caused by clogged water filters. Furthermore, water piping 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 piping, the flow sensor operates very stably without the floating issues seen in target flow switches. Feedback from years of use has not revealed any failures of the differential pressure switch itself.

SCHUNK sensor principle

Basic principles and types of ultrasonic flowmeters: As ultrasonic waves propagate through a flowing fluid, they carry information about the fluid's flow velocity. Therefore, by receiving the ultrasonic waves, the fluid's flow velocity can be detected and 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. When linked with water 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 incur manufacturing and transportation difficulties, increased costs, and greater energy loss as the measurement pipe diameter increases. Ultrasonic flowmeters avoid these drawbacks. Since all types of 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.

SCHUNK 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 required, national standards should be selected. However, if the sensor is used merely as a simple instrument for rough analysis within an enterprise, 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 mistakenly believe that new sensors inherently have higher technology levels; this 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. Commonly, there are various media such as gases, liquids, and steam. Several types of flow sensors can be universally used for these various media. The first type 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 incur manufacturing and transportation difficulties, increased costs, and greater energy loss as the measurement pipe diameter increases—ultrasonic flowmeters avoid 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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