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由徐州安全仪器厂独立完成的KGJ４遥控甲烷传感器和KGD２双路甲烷超限断电仪于２００２年１２月２７日通过了由国家煤矿安全监察局组织的技术鉴定。鉴定委员会一致认为：KGJ４遥控甲烷传感器采用红外遥控技术对零点和灵敏度进行调节，避免手动调节的误差，减少了人为因素对测量
The KGJ4 remote methane sensor and the KGD2 dual methane overrun meter, independently completed by Xuzhou Safety Instrument Factory, passed the technical appraisal organized by the State Coal Mine Safety Supervision Bureau on December 27, 2002. Accreditation Committee agreed that: KGJ4 remote methane sensor using infrared remote control technology to adjust the zero and sensitivity to avoid manual adjustment error, reducing the human factor on the measurement