为了提高气相色谱仪气路控制自动化水平,研制了电子流量/压力控制模块.该模块在基于闭环控制的方式上,通过小流量比例电磁阀、小流量和压力传感器、微型可调限流装置、颗粒过滤网、集成流路块体的优化设计,以放大基准电路、A/D转换、单片机控制系统PID、D/A转换、功率驱动电路来达到控制气体流量/压力的目的.再以单气路控制为最小单位,组合成在气相色谱中所使用的多气路为一体的控制模块组件.最后以毛细柱进样口和氢火焰离子检测器作为实例,证实了EPC电子流量/压力控制在气相色谱中应用的成功.%In order to accelerate the increase in the level of automation about gas control of gas chromatography, an electronic flow/pressure control module was developed. The module was based on the closed-loop control mode to achieve control of gas flow/pressure purposes through low flow proportional solenoid valves, low flow and pressure sensors, micro-adjustable current limiting devices, particle filters, the optimization design of integration flow path block, enlargement reference circuit, A/D conversion, single-chip system PID, D/A conversion and power drive circuit. Then the multi-gas control module component, in the gas chromatography, was made up of a single pneumatic control for smallest unit. Finally, by the capillary inlet and flame ionization detector as an example, it was confirmed that the EPC electronic flow/pressure control was successful in gas chromatography application.
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