The Research Of Equipment For Water Meter Pattern Evaluation Tests

As an important part of measurement science, flow measurement test technology has awide range of applications. The flow rate standard facility is a Standard Equipment for testing/calibrating various types of flow meters and learning flow measurement test methods. Thecomprehensive testing ability of the device reflects the science and technology level of theInstitute directly. With the development of society, the advancement of technology and therequrment of fair dealing of both sides, the species, caliber, measuring range and accuracy offlowmeter for custody transfer, energy saving measuring and controlling for enterprise hasbeen greatly improved. The original flow rate standard facility of Hebei Province is far frombeing able to satisfy the needs of verification/calibration of Flow Meter, so it is necessaryto establish a fluid flow device to satisfy the test requirements of flow measurement at presentstage.This topic has a research designing for water flow standard device of DN250-600, in thispaper, the background of the issues arise, detail design of the device and the basic workingprinciple are all elaborated in detail. At present, liquid flow standard device mainly staticmass standard facilities, dynamic mass standard facilities, static volumetric method standardfacilities, dynamic volumetric method standard facilities, master meter method standardfacilities, etc. Through the analysis and comparison of their own characteristics combinedwith operation and economic aspects, and in consideration. This design selection of the staticmass and standard table method as the basic design method and the way of frequency controland voltage regulator to carry out work of metrological verification and calibration on avariety of measuring instruments. Turnkey device includes systems of storaging, circulating,computer controlling, standard, flow control and frequency controlling, and using intelligentinstruments, inverter and other hardware devices, making PC program with software, togetherof all constitute the control system. In the certification process, this set of devices have thecharacteristics of rationalization, automation, procedures, and high measurement accuracy,and it can be achieved that the experimental study and test of a variety of flowmeter. In thispaper, according to the the requirements of overall design of the device, we have the detaileddesign of the every important part, including the production of the pool size, the shape of thecontainer, the structure of voltage regulator, etc, and there is a reasonable Selection of waterpump and other important equipment by calculation and analysis. At last, the static mass standard facilities and master meter method standard facilitiesuncertainty assessment, the uncertainty evaluation of device are described in detail, includingcommutator, electronics, standard table and other parts. The device successfully developedupdated sound the highest standards of measurement of water flow in Hebei Province, notonly can meet the requirements of a variety of large-diameter meter shape identification,verification and calibration, but also can provide strong support of equipment for scientificresearch. of the flow measurement.