Lub tshuab nqus tsev hloov yog ib hom kev hloov uas tsim los saib xyuas qhov tshwj xeeb ntawm lub tshuab nqus tsev; nws tseem hu ua lub tshuab nqus tsev relay. Nws txoj haujlwm yog qhib lossis kaw ib lub voj voog tswj -thiab ib txhij tsim hluav taws xob teeb liab- thaum lub tshuab nqus tsev tsim tawm thaum lub sijhawm ua haujlwm ncav cuag qhov yuav tsum tau ua ntej, yog li qhia lub tshuab nqus tsev adsorption kom ua tiav nws txoj haujlwm ib txwm muaj. Nws raug cais raws li ib feem tseem ceeb rau kev ntseeg siab thiab kev nyab xeeb.
Lub tshuab nqus tsev hloov tau muab faib ua peb hom: mechanical, semiconductor, thiab pneumatic choj. Cov tshuab nqus tsev hloov pauv txiav txim siab hloov pauv hauv lub tshuab nqus tsev los ntawm kev siv cov tshuab nqus tsev hloov pauv- piv txwv uas yog lub diaphragm - hom lub tshuab nqus tsev hloov. Semiconductor lub tshuab nqus tsev hloov pauv, hloov pauv, ntiav semiconductor siab sensors txhawm rau txheeb xyuas cov kev hloov pauv hauv lub tshuab nqus tsev thiab muaj peev xwm ncaj qha hloov cov teeb pom kev siab mus rau hauv hluav taws xob teeb liab.