Using the central control system PLC, intelligent temperature controller and pressure gauge to replace the three pen recorder to realize the closed loop circulation and record of outer temperature.
采用中央控制PLC、智能温控器及压力仪表等替代原进口三针记录仪，实现外温的闭环控制和记录；
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A signal (termed the "measured value") which is proportional to the pressure difference is then transmitted by means of a "differential pressure transmitter" to the recorder-controller.