How to improve the control accuracy of quantitative control system: Guangzhou Dichuan Instrumentation Abstract: quantitative control or accuracy quantitative filling system is a matter of concern to customers, the scope of the problem involves a wide, there is a part of a loophole, it will affect The final quantitative accuracy, the following I will take the quantitative control of the Duchuang instrument and meter production as an example to explain in detail the content related to the quantitative control accuracy. The accuracy of quantitative control or quantitative filling system is a problem that customers are concerned about. This problem involves a wide range, there is a loophole in one part, it will affect the final quantitative accuracy, the following I will use quantitative control For example, details about the accuracy of quantitative control. Since it is necessary to quantify, that is, to measure the quantity, a common measurement method is a flowmeter to measure the volume flow or other sensors to measure the mass flow and mass accumulation, and then the measurement accuracy directly affects the quantitative result, so when selecting a flowmeter or a sensor, Select the flowmeter or sensor with high precision and good reproducibility; second is the problem of signal transmission, common 4-20mA current signal, pulse signal, voltage signal, MODBUS485 communication and so on. In the above communication, 485 is ideal, because he can directly read the flow rate or sensor's cumulative and instantaneous flow, without the need for secondary calculations, more than one calculation, more than one error, so 485; secondary selection pulse signal, quantitative The purpose is to accumulate a certain amount, and the pulse signal has less anti-interference, the secondary calculation is also more convenient, the error is small, compared with the current and voltage, the error of the latter two is larger, it is not recommended to use; the last is the control flow, For example, use a control method for small traffic and another method for large traffic. This depends on the specific situation. Quantitative control of Guangzhou Dichuan instrumentation production can be based on customer requirements, select the most appropriate method to meet the site requirements.
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