Txhim kho thiab kho lub Dissolved Oxygen Meter
1. Dissolved oxygen electrode tu calibration, regeneration, tu thiab tu
1) Cov electrodes ntawm cov pa oxygen meter yuav tsum tau ntxuav ib zaug txhua 1 mus rau 2 lub lis piam. Yog tias muaj cov pa phem ntawm lub diaphragm, nws yuav ua rau kev ntsuas yuam kev. Kev saib xyuas yuav tsum tau ua thaum tu, saib xyuas kom tsis txhob ua kom lub diaphragm puas. Yaug cov electrode ntawm lub ntsuas oxygen yaj hauv dej huv. Yog tias cov av tsis tuaj yeem ntxuav tau, ua tib zoo txhuam nws nrog cov ntaub mos muag lossis paj rwb.
2) Qhov xoom taw tes thiab ncua yuav tsum rov ntsuas dua txhua 2 mus rau 3 lub hlis.
3) Regeneration ntawm electrode ntawm yaj oxygen meter yog ua ib xyoos ib zaug. Thaum ntsuas qhov ntsuas tsis tuaj yeem hloov kho, cov pa oxygen electrode yuav tsum tau rov tsim dua. Electrode regeneration muaj xws li hloov cov electrolyte sab hauv, hloov lub diaphragm, thiab ntxuav cov nyiaj electrode. Yog tias cov nyiaj electrode tau pom tias yog oxidized, nws tuaj yeem polished nrog cov ntawv xuab zeb zoo.
4) Yog tias cov pa hluav taws xob yaj tau tawg thaum siv, cov electrolyte yuav tsum tau hloov.
2. Dissolved oxygen meter calibration thiab calibration: Feem ntau, cov qauv kua calibration los yog nyob rau ntawm qhov chaw calibration yuav siv tau.
1) Standard solution calibration method: Standard solution calibration feem ntau siv ob-point calibration, uas yog, xoom point calibration thiab ncua calibration. Lub xoom point calibration tov siv tau 2 feem pua Na2SO3 tov. Cov tshuaj calibration ntau tuaj yeem xaiv 4M KCl tov (2mg / L) lossis 50 feem pua methanol tov (21.9mg / L) raws li qhov ntsuas qhov ntsuas.
2) Nyob rau ntawm qhov chaw calibration method (Winkler method): Hauv kev siv tiag tiag, txoj kev Winkler feem ntau yog siv rau ntawm qhov chaw calibration ntawm yaj oxygen analyzers (solved oxygen meters). Thaum siv cov qauv no, muaj ob qho xwm txheej: thaum kuaj pom, lub ntsuas kev nyeem ntawv yog A. Thaum lub ntsuas ntsuas muaj txiaj ntsig, kev nyeem ntawv yog M1. Lub sijhawm no, nws tsuas yog yuav tsum tau kho qhov ntsuas ntsuas kom sib npaug ntawm A; Thaum kuaj, ntsuas ntsuas yog M1, qhov ntsuas ntsuas ntsuas yog A, thiab ntsuas ntsuas ntsuas tau hloov mus rau M2 thaum ntsuas ntsuas ntsuas. Lub sijhawm no, ntsuas ntsuas ntsuas tsis tuaj yeem hloov kho kom sib npaug ntawm A, tab sis kev nyeem ntawv ntsuas yuav tsum tau hloov kho rau 1MA × M2.
3) Dissolved oxygen electrode regeneration: Lub teeb liab impedance ntawm yaj oxygen electrode yog siab heev (kwv yees 20MΩ), thiab qhov kev ncua deb ntawm cov yaj oxygen electrode thiab converter yog 50m; Lub yaj oxygen electrode yuav tsum tau ua haujlwm thaum tsis siv, thiab tuaj yeem txuas nrog lub tshuab hloov pauv oxygen yaj. Cov hluav taws xob uas tau muab tso rau lub sijhawm ntev lossis rov tsim dua tshiab (hloov cov electrolyte lossis daim nyias nyias) yuav tsum tau polarized nyob rau hauv qhov chaw tsis muaj oxygen rau 1 mus rau 2 teev ua ntej siv; txij li qhov kub hloov pauv muaj qhov cuam tshuam zoo rau qhov sib txawv ntawm cov electrode membrane thiab solubility ntawm oxygen, nws yog ib qho tsim nyog rau lub sijhawm ntev (kwv yees li 10 feeb) kom qhov kub thiab txias tsis kam mus txog qhov sib npaug; lub siab ib nrab ntawm cov pa oxygen muaj feem xyuam rau qhov siab ntawm thaj chaw, thiab lub meter yuav tsum tau them nyiaj raws li lub hauv paus atmospheric siab ua ntej siv; Thaum cov ntsev cov ntsiab lus ntawm kev ntsuas ntsuas siab, lub ntsuas yuav tsum tau ntsuas Siv cov tshuaj nrog cov ntsiab lus ntsev sib piv; rau txoj kev ntsuas ntws-los ntawm kev ntsuas, qhov tsawg kawg nkaus tshaj tawm ntawm 0.3m / s yuav tsum tau ntws los ntawm electrode.
