| Vortex street flow meter, Known as Karman's whirlpool flow meter, which has advantages of simple structure, high reliability, long life and wide measuring scope etc. Therefore, it applies widely. According to the requirements of technological contract of 'the low power intelligent vortex flow-meter' in the second developing task, which is entrusted by Measuring Appliance Research Institute in Hebei Hongye Machinery Co. to the measuring and controlling institute, Taiyuan university of technology. This article has completed intelligent vortex flow-meter's performance improvement and network monitoring system's development research.With the development of computer technology, communications technology and integrated circuit technology, the traditional industrial control system has a trend to network and open. Fieldbus technology, conforming to this situation, is a hot spot of automatic control and computer network, it was known as an underlying control network with the performance of an open, digital and multi-point communications. The emergence of Fieldbus makes the traditional control system a great leap forward in the performance.Through the massive industry field test, according to the question of the product which appears in the development experiment, the performance improvement duty of 'the low power intelligent vortex flow-meter' in the first developing round was completed. On this basis, embedded system technology, which consists of MSP430F149 processor, GSM network communication, Modbus communication protocol and so on, further applies in the high-end vortex flow-meter's development,improves the display and communication of the traditional Vortex Flowmeter's data, making Vortex Flow more intelligent and networking, has a positive significance and important value to research and explore the Vortex Flowmeter of China. The main research is as follows:1. On the basis of concluding the past development work and looking up the information at home and abroad, the intelligent data processing system of Vortex Flowmeter was improved, the present situation and characteristics of fieldbus were described in detail.2. Based on the GSM Modem of the Beijing Huarong communications equipment company, designs the wir, without geographical constraints, eless module, uses GSM's (Global System for Mobile Communications) SMS (Short Message Service) to realize data remote communication so as to achieve the purpose of flow measurement. This system has a lot of characteristics, such as simple, reliable3. Designed the wired communication module of Vortex Flowmeter based on the Modbus Protocol. Realized the communication system of data acquisition. The system can carry on the remote multi-point half-duplex data transmission in Modbus, Has satisfied the demand to the regional network flow measurement technology for the resident sub-district, the large industrial enterprises and so on.4. Designed the flow management system upper supervising computer by using PC Configuration Software - KingView 6.5, friendly interface, fully functional, easy to operate. The system has the performance of reliability, maintainability, security and strong operational, realizing the modernization and automation of Vortex Flowmeter's management tools.At present, signal acquisition and low-power conversion circuit of Vortex flowmeter have entered the market. Two network monitoring systems are also running and debugging, GSM network monitoring system has been tested for seven months in Cangzhou water plant, everything is OK. The network monitoring system based on Modbus Protocol are also debugged in Instrumentation Laboratory of Hebei Institute of Machinery Co., Ltd.. The two network monitoring methods are presented in this paper, are applicable in other flowmeters as well as Vortex Flowmeter. The flowmeter monitoring system based on GSM and Modbus Protocol has a broad range of applications in the field of industrial measurement and control. |
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