Hauv kev lag luam ntses noj zaub mov, "freshness" yog qhov tseem ceeb ntawm kev txiav txim siab cov khoom zoo. Qhov taw qhia tseem ceeb ntawm qhov tshiab yog Volatile Basic Nitrogen (VBN)-ib pawg ntawm cov tshuaj alkaline nitrogenous, xws li ammonia thiab amines, tsim thaum lub sij hawm muaj protein ntau decomposition. Qhov no txhais tau hais tias ammonia tsis yog tsuas yog ib puag ncig muaj kuab paug nyob rau hauv cov chaw ua khoom; nws ua haujlwm raws li qhov qhia ncaj qha ntawm qhov zoo ntawm cov khoom siv raw.
1.Qhov twg yog ammonia nyob rau hauv cov ntses noj zaub mov tuaj?
Ammonia nyob rau hauv cov nroj tsuag no tshwm sim los ntawm ob qhov chaw tseem ceeb: decomposition ntawm raw ntses nws tus kheej thiab siab - kub decomposition thaum ua. Nqaij ntses yog nplua nuj nyob rau hauv protein; Raws li kev cuam tshuam ntawm cov enzymes thiab cov kab mob, cov proteins tawg los tsim cov tshuaj nitrogenous tsis zoo xws li ammonia thiab trimethylamine. Yog li ntawd, qhov qis dua qhov freshness ntawm cov ntses noj, qhov siab dua VBN tus nqi thiab qhov ntau dua cov ammonia tso. National Standard GB/T 19164-2003 teev cov kev txwv VBN hauv qab no: Qib Tshwj Xeeb Tsawg dua lossis sib npaug li 110 mg/100g; Qib I Tsawg dua lossis sib npaug li 130 mg / 100g; thiab Qib II/III Tsawg dua lossis sib npaug li 150 mg/100g. Lub fresher cov khoom siv raw, qhov qis ammonia tso tawm thaum ua. Thaum lub sij hawm siab - qhov kub thiab txias xws li ua noj, nias, thiab ziab, ceev cov protein decomposition ua rau ntxiv qhov tseem ceeb ntawm ammonia. Kev tshawb fawb qhia tau hais tias qhov decomposition ntawm ntses pluas feem ntau tsim cov ammonia, amines, thiab sulfur-muaj cov tebchaw, ua rau kev xaiv cov ammonia sensors ua lub hauv paus tseem ceeb rau kev saib xyuas cov ntses noj tshiab.
2.Dab tsi yog qhov phom sij ntawm ammonia rau cov neeg ua haujlwm thiab kev tsim khoom?
Ammonia nyob rau hauv cov pa pa ntawm cov ntses noj zaub mov tuaj yeem ua rau ua pa ua pa thiab qhov muag kub. Hauv cov cheeb tsam uas ammonia nyiam tuaj sib sau- xws li thaj chaw ua haujlwm thiab cov khoom siv raw khoom khaws cia -ntev- lub sij hawm raug rau cov concentrations tsawg tuaj yeem ua rau muaj kev puas tsuaj rau cov neeg ua haujlwm ua pa thiab lub paj hlwb. Yuav tshuaj ammonia li cas?
(1) Portable ammonia detectors:
1) Kev soj ntsuam kev nyab xeeb niaj hnub thiab kev daws teeb meem ceev: Cov neeg ua haujlwm tuaj yeem nqa cov cuab yeej mus taug kev- los ntawm kev tshuaj xyuas hauv thaj chaw tsim khoom, cov khoom siv raw khoom, thiab ntawm cov kav dej sib txuas; Yog tias kuaj pom qhov txawv txav ntawm kev nyeem ntawv, qhov xau tuaj yeem raug txheeb xyuas sai. Nws kuj tseem siv los ua kom muaj kev nyab xeeb ib puag ncig ua ntej ua haujlwm xws li kev saib xyuas cov khoom siv lossis kev tshuaj xyuas lub tank.
2) Confined Space Entry: Ua qhov "kev sim nkag" nrog lub tshuab nqus tsev ua ntej nkag mus rau hauv lub tank, dej phwj tuaj, lossis hauv qab daus uas muaj ammonia tuaj yeem yog qhov tseem ceeb hauv kev ua kom cov neeg ua haujlwm nyab xeeb.
3) Kev Teb Thaum Muaj Xwm Ceev: Nyob rau hauv qhov xwm txheej uas xav tias yuav xau, cov neeg ua haujlwm kev nyab xeeb tuaj yeem nqa lub cuab yeej tam sim ntawd mus rau qhov chaw kom txiav txim siab sai npaum li cas thiab kev sib kis ntawm cov kab mob sib kis, muab lub hauv paus rau kev txiav txim siab tom ntej- ua.
Rau niaj hnub fishmeal processing nroj tsuag, tsau ammonia detectors muab ib tug txhim khu kev qha tshuaj. Los ntawm kev txhim kho cov cuab yeej saib xyuas online ntawm cov chaw tseem ceeb-xws li cov chaw tsim khoom, cov chaw khaws khoom siv raw, thaj chaw ziab, thiab chav txias txias- cov chaw tuaj yeem ua tiav 24- teev kev soj ntsuam tas li. Cov ntaub ntawv raug xa mus rau lub sijhawm tiag tiag mus rau chav tswj hwm hauv nruab nrab thiab sib xyaw nrog cov pa tawm thiab lub tswb. Yog tias muaj ntau tshaj qhov txwv kev nyab xeeb, lub kaw lus cia li qhib qhov cua thaum muaj xwm txheej ceev thiab ua rau muaj kev ceeb toom los tiv thaiv cov neeg ua haujlwm thiab cov khoom siv.
Qhov zoo ntawm cov ntsuas ammonia ruaj khov nyob hauv lawv lub peev xwm los muab kev txuas mus ntxiv, nyob ruaj khov, thiab thaj tsam - dav dav. Lawv yog qhov zoo tshaj plaws rau kev teeb tsa ntawm cov chaw uas paub, tsis tu ncua kev pheej hmoo (xws li compressors thiab chaw cia tank), ua kom muaj kev sib tw - lub - moos saib xyuas thiab kev koom ua ke nrog lub tswb thiab lub tshuab ua pa.
3.Detection Range:
Hauv kev cob qhia cov ntses noj ntses, cov ntsiab lus siab ntawm ammonia yog tsim thaum lub sijhawm ua noj thiab ziab. Ntawm qhov chaw ntawm cov pa pa (tshwj xeeb tshaj yog thaum cov ntaub ntawv nyoos tshiab), ammonia concentration tuaj yeem ncav cuag 100-200 ppm lossis siab dua. OSHA teeb tsa qhov luv - lub sij hawm raug txwv rau ammonia ntawm 35 ppm thiab 8- teev lub sij hawm-hnyav qhov nruab nrab qhov tso cai raug txwv ntawm 50 ppm. Rau cov cuab yeej nrog qhov ntsuas 0-100 ppm, lub tswb ntsuas feem ntau yog teem rau ntawm 25 ppm (tsawg tswb) thiab 50 ppm (siab tswb); qhov no ua kom muaj kev ceeb toom tam sim thaum qib siab tshaj, ua tau raws li qhov yuav tsum tau muaj kev nyab xeeb.
Peb cov cuab yeej ntsuas ammonia ruaj khov muab kev txuas ntxiv, tiag tiag - lub sijhawm saib xyuas ntawm atmospheric ammonia concentrations. Lawv ua rau lub suab nrov tam sim ntawd thiab pom lub tswb thaum qib siab tshaj qhov txwv thiab muaj peev xwm 4-20 mA thiab RS485 Modbus tso tawm. Cov khoom siv roj ammonia no tuaj yeem txuas rau cov tswj tau tiag tiag- lub sijhawm xa cov ntaub ntawv thiab cov kiv cua , lossis xa cov ntaub ntawv mus rau huab lossis DCS / PLC tswj cov tshuab.