CAJ | 학술논문

设计一种五段式电容液位计测量变送器。采用柱形五级电容做为液位传感器，采用PCAP01芯片测量各级电容数值，单片机通过SPI接口技术读取测量结果，经单片机处理后的数据传输给AD421芯片，输出4～20 mA信号。实验结果表明：该变送器精度等级可以达到0?5级，可以满足工业现场要求。
설계일충오단식전용액위계측량변송기。채용주형오급전용주위액위전감기，채용PCAP01심편측량각급전용수치，단편궤통과SPI접구기술독취측량결과，경단편궤처리후적수거전수급AD421심편，수출4～20 mA신호。실험결과표명：해변송기정도등급가이체도0?5급，가이만족공업현장요구。
A kind of transducer in five?segment liquid?level measurement was designed. Cylindrical five?segment capacitance was used as level sensor and PCAP01 chip was used to measure capacitance value at each level. With SPI interface technology, microcon?troller read the measurement results. Then the data were transmitted to the AD421 chip after they were processed by STM32. Finally, AD421 output 4~20 mA current signal. Experimental results show that the transmitter can reach 0?5 accuracy class and it can meet re?quirements of the industrial scene.