此系列為一個閉迴路設計，由兩個電磁閥、內部壓力傳感器及電子控制所組成。根據類比訊號輸入，
壓力係由其中一個電磁閥是用來控制進氣，另一個則用於控制排氣，以達到精確的壓力比例控制。B1S、
B3H-1 壓力輸出是由一個內部壓力傳感器測量得到並回饋至電子控制；B2S、B3H-2 則多了外部壓力傳感器
的迴授而維持更精確的壓力。
該系列比例閥命令輸入提供了 0-5VDC、0-10VDC 或 4-20mA 的選擇；還提供了 RS485 ModBus 通訊輸
出，用於輸出到面板或控制器進行數據採集或質量保證需要的監視信號；及監控輸出有 0-10V 或 4-20mA
的選擇。
This series is a complete closed loop servo system consisting of two solenoid valves, internal pressure transducer, and
electronic controls. Based on analog signal, the pressure is controlled by two solenoid valves to maintain precise pressure; one
valve functions as inlet control, the other as exhaust. The pressure output is measured by an internal pressure transducer of
B1S or B3H-1 series and provides a feedback signal to the electronic controls. As for B2S or B3H-2, there is an extra piece of
external pressure transducer for feedback to maintain higher accuracy.
This series of proportional valve input signal has a selection of 0-5VDC, 0-10VDC or 4-20mA, and also has RS485 ModBus
communication output that is used to output the monitor signal required for data acquisition or quality assurance to the panel or
controller; and the monitor output has a selection of 0-10V or 4-20mA