Cov teeb liab hluav taws xob uas siv ntau tshaj plaws hauv kev lag luam yog xa cov teeb liab hluav taws xob analog nrog 4 ~ 20mA DC tam sim no. 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. Cov xov hlau tsis kam hauv lub voj voog tsis cuam tshuam rau qhov tseeb, thiab tuaj yeem xa mus rau ntau pua meters ntawm cov khub sib ntswg ib txwm muaj. Qhov txwv siab tshaj plaws ntawm 20mA yog vim qhov yuav tsum tau ua kom tsis txhob tawg: lub zog hluav taws xob los ntawm qhov tawg tam sim no ntawm 20mA tsis txaus los ua kom cov roj kub. Qhov laj thawj vim li cas qhov txwv qis tshaj plaws tsis teeb tsa ua 0mA yog los ntes cov kab tawg: nws yuav tsis qis dua 4mA hauv kev ua haujlwm ib txwm muaj. Thaum cov kab kis tau tawg vim muaj qhov txhaum thiab cov voj voog tam sim no poob rau 0, 2mA feem ntau teeb tsa ua tus nqi ceeb toom kab tawg.
Lub sijhawm tshaj tawm: Lub Yim Hli-29-2022