| 低功耗两线制电容式液位变送器的研制 |
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| 引用本文： | 陈海侠,高宗海,申阿维,赖化凤.低功耗两线制电容式液位变送器的研制[J].西安理工大学学报,2011(4):471-476. |
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| 作者姓名： | 陈海侠 高宗海 申阿维 赖化凤 |
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| 作者单位： | 西安理工大学机械与精密仪器工程学院; |
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| 基金项目： | 陕西省教育厅科学研究基金资助项目(08JC07) |
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| 摘 要： | 针对电容式液位传感器电容量较小引起的输出阻抗高、负载能力差、信号处理困难的缺点,基于电容充放电原理电路实现微电容测量,进而设计了基于MSP430单片机的两线制电容式液位变送器。合理利用了超低功耗的16位单片机MSP430内部的比较器、计数器和D/A转换器,输出信号经V/I电路转换为4～20 mA电流,两线制变送输出。整个系统全部选用低功耗芯片,以保证变送器静态工作电流低于4 mA。采用驱动电缆技术,有效屏蔽测量电路及电缆带来的分布电容的干扰。试验结果表明,在0～700 mm范围内,液位变送器的测量精度可以达到6‰。系统可实现两线制,且功耗低,稳定可靠。
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| 关 键 词： | 电容测量 低功耗 两线制 屏蔽电缆 |
Development of a Low-Power Two-Wire Capacitive Liquid Level Transmitter |
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| CHEN Haixia,GAO Zonghai,SHEN Awei,LAI Huafeng.Development of a Low-Power Two-Wire Capacitive Liquid Level Transmitter[J].Journal of Xi'an University of Technology,2011(4):471-476. |
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| Authors: | CHEN Haixia GAO Zonghai SHEN Awei LAI Huafeng |
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| Institution: | CHEN Haixia,GAO Zonghai,SHEN Awei,LAI Huafeng(Faculty of Mechanical and Precision Instrument Engineering,Xi'an University of Technology,Xi'an 710048,China) |
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| Abstract: | With an aim at overcoming the disadvantages of high output impedance,poor load capacity and signal process difficulties caused by the small capacitance of capacitive liquid level transmitter,a low-power two-line capacitive liquid level transmitter based on microcontroller MSP430 is designed.The comparator and D/A converter inside the low-power 16-bit microcontroller MSP430 are rationally used to convert the output signal into 4~20 mA current transmitted by a two-wire way.The whole system adopts low-power ch... |
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| Keywords: | measurement of capacitance low-power consumption two-wire system shield cable |
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