Measurement requirements for flow meters in trade settlement

Compared with flow measurement in process control, environmental protection, and medical and health care, flow measurement instruments in trade settlement have distinct characteristics, and the requirements for flow measurement instruments in trade settlement of different fluids are also different. The following is an example of thermal energy trade settlement, which is currently used in a large amount, to illustrate the requirements of fluid trade settlement for flow measuring instruments. Some of the requirements are unique to thermal energy trade settlements, while others are common. In regional central heating, the heat company sells heat energy to many users, and settles the expenses according to the heat energy measurement results and the agreement between the two parties. Since this measurement is the main basis for the heat company to settle the expenses, it is generally valued by both settlement parties. It is the foundation of the operation of the thermal power company. If it is not handled properly, the benefits of the thermal power company will often be greatly lost. This kind of measurement with trade settlement as the main purpose, in addition to meeting the general requirements of flow measuring instruments, also needs to meet the special requirements required for trade settlement. Compared with process control in terms of measurement accuracy and range, there are some other requirements, which are summarized below. In terms of measurement accuracy requirements, heat energy trade settlement fees are based on system measurement results. Therefore, the accuracy of flow meters is higher than that required for process control. For differential pressure flowmeters, when measuring differential pressure, select a differential pressure transmitter with a precision of 0.2, a flow calculator with a precision of 0.2, a pressure transmitter with a precision of 0.2, and a temperature measuring element with a precision of eight.&100 platinum thermal resistance, the installation and use of the instrument also meet the requirements of the regulations. According to the square-sum root error synthesis method [6, 7], the system accuracy of ±2.5^^ can generally be obtained for each measurement point above 30^1^. For the system composed of vortex flowmeters, the flow transmitter has an accuracy of ±1^^ within the measurement range recommended by the manufacturer. After cooperating with the above-mentioned temperature and pressure measuring elements and flow calculator, it can get about ±1^^ 2^ system accuracy. If there is no major interference and the system runs stably for a long time, both the supply and demand sides are quite satisfied with the system accuracy that can be achieved by the above two measurement methods.

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