The method of frequency offset principle of ultrasonic flow meter scale

Abstract: the method of frequency offset principle of ultrasonic flow meter scale information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. In order to eliminate the influence of the sound velocity c, often using the frequency difference method. Upstream or downstream by the former, the receiver receive the ultrasonic frequency difference is del f under the available type for del f = [ （ c + u) / L) - ( （ c - u) / L) = 2 u/L, therefore, as long as measured del f flow can be obtained. More flow meter manufacturers choose model price quote you are welcome to inquire, here is the frequency difference method principle of ultrasonic flow meter scale article details. In order to eliminate the influence of the sound velocity c, often using the frequency difference method. Upstream or downstream by the former, the receiver receive the ultrasonic frequency difference is del f under the available type for del f = [ （ c + u) / L) - ( （ c - u) / L) = 2 u/L, therefore, as long as the measured flow rate Q del f can be obtained, and it has nothing to do with the speed of sound. Ultrasound technology and application of a profile, without measuring water level at present, a lot of hydropower station adopts float type level gauge or input type level gauge for water level measurement. Disadvantages: low measurement precision, unreliable, often appear float card death and sensor plug lead to uncertainty; Maintenance workload is big, installation, debugging, inconvenience, collected only simulate the alarm signal, not directly into the computer monitoring system for power plants. Of unattended power plant is not practical. Our trash rack water level measuring system for the repeated comparison, optimizing zui after come to the scheme design, using ultrasonic level meter in front of the gate, gate after the water level in real-time monitoring accurately, ultrasonic level meter with PLC to deal with collection capacity. Central control room and send real-time data of water level and pressure difference, ultrasonic level meter display and the limit alarm. Ultrasonic level meter using RS422 / RS232 interface at the same time, the centralized control room and send real-time data to dam industrial computer, processing into computer communication message, zui will collect amount sent to the PC power plant computer monitoring system. After the introduction of the project not only meet the bar corrupt gate before the gate, the gate after the water level and pressure difference of multipoint real-time monitoring, and alarm function, and the end of the trash rack measurement systems work independently, with the power plant computer monitoring system of communication. Implementation and gate monitoring function, control function of the system and failure ON - CALL paging system function integration. Meet the needs of the unattended station. The technology in power system or the * house of yunnan province. Second, the principle of ultrasonic level meter measuring water level and installation requirements of ultrasonic level meter, high frequency pulse waves by the transducer ( The probe) Issue, encounter (object to be tested The surface of the water) Surface is reflected back the echo is the same transducer ( The probe) Receiving, converted to electrical signals. Pulse of time between the sending and receiving ( Acoustic time) Proportional to the distance of the transducer to the surface, the acoustic transmission distance of S and the relationship between the sound velocity C and transmission time T can be expressed in formula: S = C x T / 2, for example: the sound velocity C = 344 m/S, transmission time is 50 ms, can compute the distance of the transmission of 17. 2 m, measuring distance is 8. 6m。 Programmable ultrasonic trash rack type water level measurement system is the effect of the application in the field of dam power station with ultrasonic level meter measuring water level of dam at present in domestic is not common, technically there is no experience to draw upon. In such cases, we make full use of the PLC and the field of ultrasonic level meter of advanced technology, in accordance with the overall plan, long-term consideration, once in place, to avoid repetition and modification, duplication of investment of this principle, to design the project successfully completed the topic in an all-round way. Obtains a valuable experience in this field. To achieve at present, the domestic hydropower station on the dam water level monitoring system can provide a reference sample. Above is all there is in this article, you are welcome to inquire me manufacturer flowmeter selection, quotation, etc.

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