German STAUFF sensors, STAUFF models, STAUFF prices

STAUFF pressure sensors for level measurement. Submersible static pressure level transmitters (level gauges) operate on the principle that the static pressure of the measured liquid is proportional to its height. They use advanced imported isolated diffused silicon sensing elements or ceramic capacitive pressure sensors to convert static pressure into electrical signals. These signals undergo temperature compensation and linearization to produce standard electrical signals (typically 4–20mA/15VDC).

STAUFF sensor features

Currently, baffles can be designed according to water flow rate to reduce water resistance generated as water passes through the flow sensor, thereby reducing head loss in the water system. However, due to long-term impact from water flow, baffle-type sensors still suffer from fatigue issues; setpoint drift may occur even if the flow value was calibrated at the factory. They are typically used where precise protection of flow values is not required, i.e., for flow interruption protection when water flow in pipes is suddenly cut off. In China, very few are designed specifically for water-source heat pump units. Baffle-type sensors are specifically developed for water flow monitoring in water-loop/ground-source heat pump air conditioning units. They are equipped with different baffles for different pipe diameters. 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 equipped with pipe fittings identical to those of the water-loop heat pump unit's water pipes. Only connection to the water pipe is required on-site, 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 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 when water flow decreases 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, flow sensors operate very stably without the floating issues seen in target flow switches. Feedback from years of use has revealed no failures of the differential pressure switch itself.

STAUFF sensor principles

Basic principles and types of ultrasonic flowmeters: When ultrasonic waves propagate through 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, and thus 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 only come into application 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 open-channel flow. 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. Installation and maintenance of the instrument do not affect production pipeline operation, 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 disadvantages. 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 drainage. In power plants.

STAUFF 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 standards selected vary. If highly professional data and results are required, national standards should be selected. However, if the sensor is merely 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 inherently possess higher technology, which is a one-sided view. New products must feature 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 sense 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 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 are 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 incur manufacturing and transportation difficulties, increased costs, and greater energy loss as the measurement pipe diameter increases—ultrasonic flowmeters avoid these disadvantages. 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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