電子壓力開關的輸出類型
目前電子壓力開關的輸出類型基本都為4-20mA的電流輸出，而不是很久之前的0-5V電壓輸出，這是因為4-20mA的電流輸出有著如下的優點。
1.4-20mA的電流輸出可以在信號需要遠距離傳輸或使用環境中電網干擾較大的場合中使用，而電壓輸出則不可以，否則會出現抗干擾能力較差，精度低等缺點，4-20mA的電流輸出則充分彌補了這一點，不僅具有極高的抗干擾能力，還有效的保證了電子壓力開關的使用精度，這也是目前市面上普遍使用這一輸出類型的原因之一。
2. 4-20mA的輸出類型中，最小的電流信號4mA是靜態工作電流，有利于工作人員及時發現故障的存在；而最大電流20mA不僅可以保證工業現場的電流安全，還是功耗最小的電流信號。
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