浮子沿著一根豎直的導管移動。浮子中的一個永磁體驅動舌簧觸點並接通電阻鏈。電阻鏈如同一個分壓器,產生的電壓值對應介質的物位。解析度依賴於所用的觸點的數量。測量不受介質的電氣特性、壓力、溫度和密度的影響。
浮子內的永磁體驅動導管中的舌簧開關。當觸發時,這些舌簧開關接通導管內的電阻鏈,這樣總的電阻值不斷的發生變化,變化依賴於解析度。 輸出回路有3線制分壓器,4mA…20mA和2線制PLM信號形式。
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