Sib piv ATEX thiab Ex-Proof Classifications
Cov neeg tsim khoom tuaj yeem xaiv thiab nruab cov cuab yeej siv rau qhov chaw muaj peev xwm tawg tau siv ATEX thiab cov qauv pov thawj yav dhau los. Ex-Proof yog siv nyob rau hauv North America thiab Canada whereas ATEX yog siv nyob rau hauv cov teb chaws Europe.
Nws yog ib qho tsim nyog los txiav txim siab qhov zoo ntawm cov khoom siv uas yuav muaj nyob nrog rau cov txheej txheem ib puag ncig. Qhov no yog ua tiav txhawm rau txhawm rau txheeb xyuas qhov phom sij ntawm cov pa roj thiab plua plav cua thiab ua raws li kev ceev faj kom raug.
ATEX
Cov cheeb tsam yog siv nyob rau hauv ATEX cov lus qhia txhawm rau txheeb xyuas cov pa roj thiab plua plav cua uas yuav ua rau tawg. Cov kev faib tawm txawv ntawm lub xeev uas tsis muaj hluav taws xob tsis tu ncua (Zones 0 thiab 20) mus rau qhov xwm txheej uas tsis muaj hluav taws xob tshwm sim (Zones 2 thiab 22).
Hmoov thiab hmoov av muaj nyob rau hauv Zones 20, 21, thiab 22. Gas, vapour, thiab pos huab muaj nyob rau hauv Zones 0 thiab 1.
Ex-Cov pov thawj
Txhawm rau paub qhov txawv ntawm cov pa roj thiab plua plav cua, Ex-pov thawj ntiav cov chav kawm (1 thiab 2). Tom qab ntawd, hom roj av (A, B, C, D) thiab plua plav (E, F, G) raug faib los ntawm kev faib tawm. Qhov nrov tshaj plaws subdivision rau milling thiab sib tsoo daim ntawv thov yog G vim nws suav nrog zaub mov, nplej, thiab hmoov av.
Cov chav kawm raug muab faib ua pawg (1 lossis 2; saib hauv qab) txhawm rau txiav txim siab txog qhov muaj feem cuam tshuam tsis pom kev tshwm sim.
Chav Kawm 1 (A, B, C, D) gases, vapors, thiab pos huab; Chav Kawm 2 (E, F, thiab G) hmoov thiab hmoov av.
Division 1: Ignitable Conditions tam sim no 10-1000 teev txhua xyoo; Division 2: Ignitable Conditions nthuav tawm 10-100 teev txhua xyoo.
Spark Sources
Yuav kom tawg tau tshwm sim nyob rau hauv ib puag ncig ntawm combustible gas los yog hmoov av, yuav tsum muaj ib tug ignition qhov chaw. Cov khoom siv hluav taws xob tsim nyog muaj xws li:
Qhov kub thiab txias (ua rau, piv txwv li, los ntawm milling thiab sib tsoo) > Hluav taws xob cov hluav taws xob > Mechanically generated impact sparks > Mechanically generated friction sparks > hluav taws xob tam sim no tawm
IP thiab NEMA Ratings
Cov ntaub thaiv hluav taws xob tseem yuav tsum tau lees paub rau qib uas ua rau lawv muaj kev nyab xeeb siv hauv ATEX thiab cov xwm txheej qub. Cov ntaub ntawv siv hauv kev lag luam yog ntawm National Electrical Manufacturers Association (NEMA) thiab Ingress Protection (IP) pawg.
Thaum NEMA ratings (siv nyob rau hauv North America) coj tej yam no mus rau hauv tus account nrog rau lwm yam tsis xws li corrosion thiab kev tsim cov ntsiab lus, ib tug IP ntsuam xyuas (siv nyob rau hauv cov teb chaws Europe) tsuas yog soj ntsuam tiv thaiv kev nkag mus ntawm cov khoom txawv teb chaws thiab infiltration ntawm dej. Raws li qhov tshwm sim, nws tsis tuaj yeem sib piv ob qhov kev ntsuas kom raug. Cov hauv qab no yog cov npe ntawm cov npe nrov tshaj plaws IP thiab NEMA kev ntsuas rau milling thiab sib tsoo daim ntawv thov.
>NEMA 7: Tsim kom muaj qhov tawg hauv qhov tsis muaj kev pheej hmoo. > NEMA 3S / IP54: Ib qib ntawm kev tiv thaiv plua plav thiab dej txau los ntawm txhua qhov kev qhia. > NEMA 4X / IP66: Tag nrho tiv thaiv kev nkag mus ntawm cov plua plav thiab cov dav hlau muaj zog ntawm cov dej. Npaj rau siv nyob rau hauv Chav Kawm 1 Division 1 / Zone 0 / Zone 1. > NEMA 9: Tiv thaiv cov plua plav los ntawm kev nkag mus thiab cov khoom siv hluav taws xob ua kom sov los ntawm cua sov lub qhov rooj rau qhov chaw uas yuav ua rau cov plua plav nyob ib puag ncig kub hnyiab.
Rho tawm System
Txhawm rau tshem tawm qhov muaj peev xwm tawg, compressed cua los yog inert gas yog cia rau hauv lub thawv. Lub kaw lus yog nyob rau hauv lub siab zoo, uas tso cai rau cov dej ntws ntawm cov huab cua los yog roj mus rau hauv lub enclosure thaum tiv thaiv kev nkag ntawm huab cua los yog roj los ntawm ib puag ncig cua.
Cov roj purging ntawm kev xaiv feem ntau yog nitrogen, tab sis lwm txoj hauv kev muaj xws li carbon dioxide (uas tsis yog tag nrho inert), argon, thiab helium.
