Cov pa hluav taws siv nyob rau hauv cov pa luam yeeb yog hom ion thiab photoelectric hom.
Nws muaj cov khoom siv hluav taws xob me me (cov tshuaj tiv thaiv hluav taws xob) hauv cov ion sensor. Cov hluav taws xob tuaj yeem ua rau lub zog ionization ntawm cov tshuaj nyob ze tsim hluav taws xob hluav taws xob. Thaum cov pa luam yeeb nkag mus, qhov ntau ntawm cov tshuaj tiv thaiv ionizing ua rau lub tshuab hluav taws xob hloov. Yog tias muaj hluav taws kub, qhov hloov hluav taws xob hauv cheeb tsam tuaj yeem paub seb puas muaj pa taws.
Photoelectric sensor yog lub teeb kab teeb ci nyob ib sab ntawm tus neeg txais, ib txwm tus txais yuav tsis tuaj yeem txais lub teeb ci, thaum muaj pa taws, vim tias qhov tsis kam, xav txog, tawg ntawm cov pa taws, kom tus txais tau txais lub teeb, thiab xa cov teeb liab tawm Cov.