Qhov sib txawv ntawm qhov tshwm sim feem ntau yog nyob rau hauv qhov pom ntawm cov pa luam yeeb thiab qhov ntsuas kub ntawm qhov hluav taws kub sib txawv. Qhov qis ntawm cov pa taws tua hluav taws yog puag ncig, thiab cov pob hauv ob sab yog muab nrog cov hlau mesh. Qhov qis ntawm qhov ntsuas kub ntsuas qhov ntsuas hluav taws xob yog nyob rau hauv cov duab ntawm qhov qhib, uas zoo li lub pob iav dej.
Qhov sib txawv ntawm kev siv feem ntau yog nyob rau hauv cov pa luam yeeb, tsuav yog cov pa luam yeeb, plua plav, dej vapor, thiab lwm yam raug kuaj, thaum qhov kub thiab txias yog siv los ntsuas qhov ntsuas ntawm 67 txog 91 degrees.
Nyob rau hauv txoj cai, lub photoelectric pa luam yeeb detector muaj ib tug dub maze nyob rau hauv, thiab tshuab pa taws mus rau lub maze yuav tswb. Feem ntau, lub thermistor yog siv los ua qhov ntsuas kub. Txhawm rau txhawm rau txheeb xyuas qhov hluav taws kub sai li sai tau, lub thermistor yuav tsum raug nthuav tawm. Nyob rau hauv txoj kev no, lub sensor yog ib qho yooj yim rau kev puas tsuaj nyob rau hauv txoj kev thauj mus los, yog li nws kuj xav tau cov yas rau kev tiv thaiv.