The data acquisition instrument, which is called the data acquisition transmission instrument, is mainly applied to the field end of the environmental online monitoring system. The data acquisition instrument mainly realizes the data terminal unit that collects and stores the data of various types of monitoring instruments and meters, and can complete the data transmission function with the upper computer, and has a separate data processing function.
The data acquisition transmitter is a connection instrument between the field instrument and the host computer system. The data acquisition transmitter collects the monitoring data, status and other information of the monitoring instrument through digital channels, analog channels and digital channels, and then transmits the data and status to the upper computer through the transmission network; the upper computer transmits control commands through the transmission network, and data acquisition and transmission The instrument controls the operation of the instrument according to the command. In the whole environment online monitoring system, the upper computer is the collective name of the online monitoring system software platform, and the lower computer is the general term for the field instrumentation, including the industrial control computer with the calculation processing capability provided by the instrument supplier.
1. Management normalization
The data acquisition transmitter is an essential component of the pollution source online monitoring system, and its main function is to manage the normalization. In accordance with the requirements of relevant national standards, the role of the online monitoring system is to establish an information platform that is unified, functionally consistent, and up-to-date across the province, enabling information synchronization between enterprises, operation and maintenance units, county-level environmental protection, municipal environmental protection and provincial monitoring platforms. Connected. The data generated by the system is the reference standard for government environmental protection department supervision and enforcement, and has clear requirements for data sources, data formats, data accuracy, and frequency of acquisition. Instrument manufacturers are only responsible for the accuracy of the analysis data, and many instruments have their own data transmission methods, which results in inconsistent data interfaces, resulting in management confusion. The role of the data acquisition transmitter can solve this chaotic situation. After the front-end instrument and the host computer are connected by the data acquisition and transmission device, the "field instrument + data acquisition instrument" mode conforms to the national standard, and the normalized management is well realized.
2. Operation and maintenance standardization
The data acquisition transmitter is a guarantee for the standardization of operation and maintenance. After the online monitoring and monitoring system is completed, the system operation, maintenance and management is the key to ensure the normal operation of the system. Only by first realizing the stability of data transmission, can the accuracy of online monitoring data be gradually improved, and finally the monitoring data is used as the basis for environmental management. aims. Therefore, using a stable data acquisition and transmission instrument, the operation and maintenance work can be stylized and standardized to improve the efficiency of system maintenance and emergency treatment.
3. Transmission standardization
The data acquisition transmitter achieves standardization of data transmission. The online monitoring system uses a common software platform for the host computer, and the front end is an independent station and an independent acquisition system. The data transmission in the on-site system involves two parts, communicating with the host computer system and communicating with the field instrument (or field machine). At present, all PC monitoring platform suppliers use the standard HJ/T212-2005 protocol to communicate with the field machine. Due to the wide variety of field instrument communication, the output signals are not the same. The data acquisition transmitter is compatible with these communication methods, and the instrument output signals or data are standardized data processing, so that different types of instruments and various data monitoring platforms can achieve "transparent transmission". At present, most of the flue gas systems in the market bring their own industrial computers, and some manufacturers' water quality instrument systems also bring industrial computers. However, the industrial computer only serves as a part of the instrument end, and also requires a data acquisition transmitter to achieve standardized data transmission.
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