Thaum siv rau kev soj ntsuam cov ntawv thov kev lag luam, cov ntsuas pom tuaj yeem sau cov xeeb ntxwv. Sensor cov cim qhia tau siv nyob rau hauv cov txheej txheem los txuas ntxiv khiav pauv mus rau thaj chaw raug saib xyuas. Ob chav digital thiab analogue cim tuaj yeem tshwm sim.
Feem ntau yog cov hluav taws xob voltage lossis tam sim no tus nqi yog tsim tawm uas sib raug zoo rau lub cev hloov uas tau raug saib xyuas
Kev ua kom muaj npe ntsuas teeb liab yog qhov yuav tsum tau thaum cov txheej txheem kev siv tshuab yuav tsum tau ua kom muaj kev sib tham tas li lossis ncav cuag. Qhov no yog qhov tseem ceeb tshaj plaws rau kev siv cov kev siv ua haujlwm tsis siv neeg. Cov cim hluav taws xob qauv hluav taws xob feem ntau yog siv rau cov txheej txheem engineering. Analogue Qauv Txiaj Ntsig / Voltage 0 (4) ... 20 ma / 0 ... 10 V tau tsim lawv tus kheej raws li ntsuas kev ntsuas lub cev thiab tswj kev hloov pauv.