Abstract：To meet the requirements of low power consumption of electromagnetic water meters, an intermittent excitation method was proposed, and three-value wave excitation was performed every cycle. In response to the requirements of electromagnetic water meters to achieve a very low measurement lower limit under the condition of a small excitation current and a very weak sensor output signal, a processing method of signal reconstruction filtering was proposed to reconstruct the amplitude demodulated signal into a rectangular wave signal, so as to facilitate the comb band-pass filtering of the signal, thereby ensuring the measurement accuracy of electromagnetic water meters. The transmitter based on the MSP430 low-power MCU was developed and the water flow calibration experiments were carried out. The results show that the system can meet the measurement accuracy of the first-class water meter, and the lower limit of flow measurement can reach 0.4m3/h, and the turn-down ratio can reach 400.
于新龙,徐科军,许伟,吴建平,闫小雪. 基于间歇励磁和信号重构的电磁水表变送器研制[J]. 计量学报, 2021, 42(9): 1160-1166.
YU Xin-long,XU Ke-jun,XU Wei,WU Jian-ping,Yan Xiao-xue. Development of Electromagnetic Water Meter Transmitter Based on Intermittent Excitation and Signal Reconstruction. Acta Metrologica Sinica, 2021, 42(9): 1160-1166.
［1］王青, 陆德康. 浅谈电磁流量计与电磁水表的区别［J］. 工业计量, 2015, 25 (6): 12-14.
［2］汪春畅, 许伟, 徐科军, 等. 具有零漂容忍度和非线性校正功能的电磁流量计仪表系数计算方法 ［J］. 化工自动化及仪表, 2017, 44 (9): 837-840.
Wang C C, Xu W, Xu K J, et al. Calculation method of electromagnetic flowmeter coefficient with zero-drift tolerance and nonlinear correction functions ［J］. Control and Instruments in Chemical Industry, 2017, 44 (9): 837-840.
［3］杨双龙, 徐科军, 梁利平, 等. 基于DSP的浆液型电磁流量计的研制 ［J］. 仪器仪表学报, 2011, 32 (9): 2101-2107.
Yang Sh L, Xu K J, Liang L P, et al. Development of DSP based slurry type electromagnetic flowmeter ［J］. Chinese Journal of Scientific Instrument, 2011, 32 (9): 2101-2107.
［4］张振, 徐科军, 杨双龙, 等.具有快速响应的电磁流量计高低压励磁系统 ［J］. 电子测量与仪器学报, 2013, 27 (6): 562-571.
Zhang Zh, Xu K J, Yang Sh L, et al. High and low voltage excitation system with high speed response for electromagnetic flow-meter ［J］. Journal of Electronic Me-asurement and Instrument, 2013, 27 (6): 562-571.
［5］吴建平, 徐科军, 许伟, 等. 基于电压电流比的瞬态电磁流量测量方法 ［J］. 计量学报, 2019, 40 (5): 829-834.
Wu J P, Xu K J, Xu W, et al. Transient Electromagnetic Flow Measurement Method Based on Voltage-to-current Ratio and its Realization ［J］. Acta Metrologica Sinica, 2019, 40 (5): 829-834.
［6］姚灵. 电子水表传感与信号处理技术［J］. 自动化仪表, 2009, 30 (3): 1-5.
Yao L. Electronic water meter sensing and signal proces-sing technologies［J］. Process Automation Instrum-entation, 2009, 30 (3): 1-5.
［7］Windgassen H. Municipal water metering-the electromag-netic solution［J］. World Pumps, 2006, 2006 (483): 26-29.
［8］王云平, 邵定国, 李朝东. MSP430单片机在新型智能水表开发中的应用［J］. 计量技术, 2005, (10): 11-12.
［9］刘玉. 电磁式水表的技术特点与应用［J］. 铁道技术监督, 2010, 38 (7): 34-35.
［10］姚灵. 电磁流量传感器与电磁电子水表［J］. 上海计量测试, 2012, (6): 2-5.
Yao L. Electromagnetic flow transducer and electroma-gnetic electronic water meter［J］. Shanghai Measurement & Testing, 2012, (6): 2-5.
［11］Garmabdari R, Shafie S, Isa M M. Sensory system for the electronic water meterC］// IEEE.International Conference on Circuits & Systems. Seoul, South Korea: IEEE, 2012: 223-226.
［12］张然, 徐科军, 杨双龙, 等. 采用梳状带通滤波的电磁流量计信号处理系统［J］. 电子测量与仪器学报, 2012, 26 (2): 177-183.
Zhang R, Xu K J, Yang Sh L, et al. Digital signal processing system for electromagnetic flowmeter with comb-shaped band-pass filter ［J］. Journal of Electronic Measurement and Instrument, 2012, 26 (2): 177-183.
［13］许伟, 徐科军, 梁利平, 等. 基于示值误差拟合的电磁流量计特征系数计算方法 ［J］. 自动化仪表, 2017, 38 (8): 100-102.
Xu W, Xu K J, Liang L P, et al. Calculation method based on indication error fitting for the characteristic coefficient of electromagnetic flowmeter ［J］. Process Automa-tion Instrumentation, 2017, 38 (8): 100-102.
［14］KROHNE. WATERFLUX3070 Technical Datasheet［EB/OL］. (2018-11-07)［2019-08-25］https://cdn. krohne. com/dlc/TD_WATERF-LUX3070_V2_en_161207_4000663109_R09. pdf. 2016-12/2019-08.
［15］SITRANS. SITRANS MAG 8000［EB/OL］. (2018-11-18)［2019-08-28］. https://support. industry. siemens. com/cs/document/10976-2363/sitrans-mag-8000?dti=0&dl=zh&pnid=1731-7&lc=en-WW.
2021, Vol. 42 
