Cov teeb liab hluav taws xob analog uas siv ntau tshaj plaws hauv kev lag luam yog siv 4-20mA DC tam sim no los xa cov analog. Qhov laj thawj rau kev siv cov teeb liab tam sim no yog tias nws tsis yooj yim rau kev cuam tshuam, thiab qhov tsis kam sab hauv ntawm qhov tam sim no yog qhov tsis kawg, thiab qhov tsis kam ntawm cov hlau hauv series hauv lub voj voog tsis cuam tshuam rau qhov tseeb, thiab nws tuaj yeem xa ntau pua meters ntawm cov hlau sib txuas ib txwm. Qhov txwv siab tshaj plaws yog 20mA vim yog qhov yuav tsum tau ua kom tsis txhob tawg: lub zog hluav taws xob los ntawm kev qhib-tawm ntawm 20mA tam sim no tsis txaus los ua kom cov roj kub. Qhov laj thawj vim li cas qhov txwv qis tshaj plaws tsis teeb tsa rau 0mA yog kom pom qhov txiav tawm: nws yuav tsis qis dua 4mA thaum lub sijhawm ua haujlwm ib txwm. Thaum cov kab xa hluav taws xob tawg vim muaj qhov txhaum, lub voj voog tam sim no poob rau 0, thiab 2mA feem ntau siv ua tus nqi ceeb toom txiav tawm.
Lub sijhawm tshaj tawm: Lub Kaum Hli-15-2021