ABB控制器係統ei810
1.傳感器：壓力繼電器通常使用壓力傳感器來檢測壓力變化。
2.比較器：傳感器會將探測到的壓力值與預設的上下限值進行比較。如果探測到的壓力超出了設定值範圍，比較器會將信號發送到繼電器。
3.繼電器：收到比較器發送的信號後，繼電器會開啟或關閉電路，控制某個設備的運行。
例如，當水泵運行時，可以使用壓力繼電器來控制水的壓力範圍。當水壓力低於預設的低壓力值時，繼電器會發送信號給水泵，啟動水泵以增加水壓力。當水壓力高於預設的高壓力值時，繼電器會發送信號給水泵，關閉水泵以降低水壓力。
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