Analysis of electromagnetic flowmeter system design principles

Case introduction

　　Today I will tell you about the design principles of electromagnetic flowmeter system:

　　1, improve the detection accuracy of electromagnetic flowmeter system. Detection accuracy is an important indicator of the success of the instrumentation system development. In improving detection accuracy should be optimised from the hardware circuit design, software processing (digital filtering, non-linear compensation, etc.), improve the level of excitation technology and anti-jamming, etc., comprehensive consideration of all aspects of the factors that will have an impact on the flow detection of interfering factors for the necessary technical processing.

　　2, improve system intelligence. The intelligence of the instrument includes control intelligence and data processing intelligence. In the development of this system should make full use of the microprocessor's powerful control capabilities, software control and management of instrumentation measurement process, to avoid the use of conventional instrumentation in a large number of digital circuits, that is, as far as possible to achieve the ‘hardware software’. In addition, the system should have range selection, measurement mode selection, automatic zeroing and other functions, its software should have digital filtering, non-linear correction and other mathematical processing capabilities.

　　3, improve the openness of the system. Openness includes hardware circuit openness, software design openness and openness of the system communication interface three parts. Hardware function module division should be clear, the circuit function unit should be independent of each other, in order to achieve plug and play. At the same time, the components that make up the circuit unit should be versatile, good alternative; software design should take into account the readability and expandability, easy for others to secondary development; to take full advantage of the advantages of the RS-485 standard bus, in strict accordance with the communication protocol for the development of communication modules to facilitate the user's networking configuration.

　　4, improve system reliability. Due to the harsh working environment of the instrumentation system, in order to ensure that the electromagnetic flowmeter system has a very high degree of reliability, in the device selection should be considered mature products; in the hardware design should be equipped with power supply monitoring, power-down protection, automatic diagnostics, etc., analogue and digital circuits must be optically isolated from each other; software design must be taken on the fault-tolerant, filtering, software traps and other anti-interference measures.

　　5, reduce system costs. In the case of the system can meet the task requirements, in order to obtain a high cost-effective, should be used as far as possible, simple, practical programmes, while trying to select cost-effective, powerful components. Doing so can not only reduce the system cost, but also simplify the system structure, reduce the size of the system, increase system reliability. In addition, cost reduction should not only consider the cost of hardware, but also the cost of development and the use of maintenance costs. Therefore, in the development of the system should try to use mature theories and methods to improve the probability of one-time success of the system development, shorten the development cycle and reduce development costs.

　　6, improve the system easy to operate and maintain. The system should have a friendly operation interface to reduce the requirements of the operator, so that the operator can operate smoothly according to the operating instructions; at the same time, the system should be easy to maintain, so that when the system fails to be able to troubleshooting in a timely manner.