Zero-point migration, tseem hu ua xoom- taw tes hloov, yog ib qho kev ntsuas coj los kov yeej xoom-point offset tshwm sim thaum lub sij hawm kev teeb tsa ntawm qhov sib txawv siab ntsuas qhov ntsuas vim qhov tsis sib xws ntawm lub tshuab xa hluav taws xob siab kais thiab lub thawv lub siab kais, lossis kev ua raws li kev ntsuas cais tawm.
Thaum lub sij hawm ntsuas kev teeb tsa, rau cov laj thawj xws li cov cuab yeej teeb tsa qhov chaw thiab yooj yim ntawm kev saib xyuas thiab kev ua haujlwm los ntawm cov neeg ua haujlwm txheej txheem, lub tshuab xa hluav taws xob yuav tsis tas li nyob rau tib lub dav hlau kab rov tav raws li lub siab kais. Tsis tas li ntawd, yog tias qhov ntsuas nruab nrab yog cov kua nplaum heev lossis cov kua nplaum, nws tsis tuaj yeem nkag ncaj qha rau hauv lub transmitter; ib qho kev sib cais kua tank yuav tsum tau ntsia kom xa cov teeb liab siab thiab tiv thaiv corrosion ntawm ntsuas ntsuas. Hauv cov xwm txheej zoo li no, qhov cuam tshuam ntawm qhov ntsuas nruab nrab thiab cov kab ke cais tawm ntawm cov ntsuas ntsuas siab yuav tsum tau txiav txim siab. Txhawm rau tshem tawm qhov cuam tshuam ntawm qhov chaw teeb tsa lossis cov kua cais tawm ntawm lub ntsuas ntsuas siab nyeem ntawv, xoom- taw tes tsiv teb tsaws yog tsim nyog. Thaum siv cov khoom sib txawv siab sib txawv, yuav tsum tau them nyiaj rau ntau yam uas muaj, suav nrog kev hloov pauv roj silicone, tshwj xeeb tshaj yog rau me me - ntau yam sib txawv siab transmitters. Zero-Txoj kev tsiv teb tsaws chaw tuaj yeem muab faib ua peb pawg tseem ceeb: tsis muaj kev tsiv teb tsaws chaw, kev tsiv teb tsaws tsis zoo, thiab kev tsiv teb tsaws zoo.
Txoj Cai Ua Haujlwm
Thaum siv lub ntsuas qhov ntsuas qhov sib txawv los ntsuas cov kua theem, xoom- taw tes ua haujlwm feem ntau yog qhov teeb meem vim qhov chaw sib txawv. Muaj peb qhov xwm txheej: tsis muaj kev hloov pauv, hloov pauv zoo, thiab tsis zoo hloov pauv.
Tsis muaj kev hloov pauv (low-siab tapping kab yog khoob)
Rau lub tank kaw lossis cov hlab ntsha tawg, cia lub siab hauv qab yog P, lub siab saum cov kua dej yog P3, thiab cov kua theem siab yog H, ces peb muaj: P=P³ + Hpg
Qhov twg: p yog qhov ceev ntawm qhov nruab nrab, thiab g yog qhov nrawm vim lub ntiajteb txawj nqus.
ΔP=P - P³=Hpg
Feem ntau, qhov ceev ntawm qhov nruab nrab raug ntsuas yog paub. Lub siab sib txawv ΔP yog ncaj qha proportional rau cov kua theem siab H; los ntawm kev ntsuas qhov sib txawv ntawm qhov siab, cov kua theem siab tuaj yeem txiav txim siab.
Kev tsiv teb tsaws zoo (tsawg-siab tapping kab yog khoob)
Kev tsiv teb tsaws tsis zoo
Thaum lub thawv ntsuas tau qhib, cov roj theem siab yog atmospheric siab. Lub siab tsis zoo ntawm qhov ntsuas qhov sib txawv tuaj yeem tso rau hauv qhov chaw, thiab lub ntsuas siab kuj tuaj yeem siv los ntsuas cov kua theem. Yog tias lub thawv kaw lawm, qhov tsis zoo siab chamber ntawm qhov ntsuas qhov sib txawv yuav tsum tau txuas nrog rau theem roj ntawm lub thawv.
Piv txwv tsis muaj migration:
Differential siab ntsuas ntsuas ntsuas siab los ntawm qhov sib txawv siab tsim ntawm cov kua thiab lub siab zoo thiab qhov tsis zoo ntawm lub tshuab xa tawm. Yog tias qhov zoo thiab qhov tsis zoo ntawm lub tshuab xa tawm thiab lub siab tapping point ntawm lub thawv yog nyob rau tib lub dav hlau kab rov tav, thaum H=0, ΔP=0; uas yog, ΔP=Ppositive-Pnegative=ρgH, thiab lub siab yuav hloov linearly nrog qhov nce ntawm cov kua theem.
Yog hais tias qhov ceev ntawm cov kua hauv lub tank cia yog 1.2, thiab cov kua theem fluctuates nyob rau hauv qhov ntau ntawm 0-4m, xam qhov ntau ntawm lub transmitter.
Kev daws: Raws li cov qauv: ΔP=Ppositive - Pneumonia=ρgH
Tag nrho qib: P1=1.2 × 9.8 × 4=47.06 kPa
Nyob rau theem khoob: P1=1.2 × 9.8 × 0=0 kPa
Ntawm ob theem puv thiab khoob: P2=0 kPa
Transmitter qhov ntau yog: 0-47.06 kPa
Piv txwv ntawm kev tsiv teb tsaws zoo:
Thaum qhov sib txawv siab transmitter nyob rau ntawm txoj hauj lwm h hauv qab cov kua theem siv dav hlau, yuav tsum muaj kev tsiv teb tsaws zoo.
Yog hais tias qhov ceev ntawm cov kua nyob rau hauv lub tank yog 1.2, thiab cov kua theem H fluctuates nyob rau hauv qhov ntau ntawm 0-4m, nrog rau h yog 1m, xam qhov ntau ntawm lub transmitter.
Kev daws: Raws li cov qauv: ΔP=Ppositive - Pneumonia=ρgH
Tsawg- sab siab P2: Txij li thaum nws qhib rau huab cua, nws xav tias yog 0.
Siab -siab sab P1: P1=ρg(H + h)
Cov kua dej tag nrho: P1=1.2 × 9.8 × (4 + 1)=58.8 kPa
Ntawm cov kua dej khoob: P1=1.2 × 9.8 × ({2}})=11.76 kPa
Lub transmitter qhov ntau yog: 11.76 - 58.8 kPa
Xaus: Yog vim li cas rau qhov zoo xoom- taw tes tsiv teb tsaws ntawm lub transmitter no yog tias txawm tias thaum cov kua theem yog 0, tseem muaj cov kua theem siab ntawm 11.76 kPa siv rau sab zoo siab ntawm lub transmitter.
Piv txwv ntawm kev tsiv teb tsaws tsis zoo:
Nyob rau hauv cov kua theem ntsuas system qhia nyob rau hauv daim duab, lub roj theem siab qhia raj yog sau tsis muaj roj tab sis nrog condensate (nws qhov ceev yog kwv yees li ntawm cov dej nyob rau hauv lub thawv).
Yog hais tias qhov ceev ntawm cov dej nyob rau hauv lub tank yog 1.0, cov kua theem H fluctuates nyob rau hauv qhov ntau ntawm 0-2m, thiab H0 yog 2.5m, xam qhov ntau ntawm cov transmitter.
Kev daws: Raws li cov qauv: ΔP=Ppositive - Pneumonia=ρgH
Tsawg-siab sab P2: P2=ρgH0
Siab -siab sab P1: P1=ρgH
Tsawg- sab siab ntawm qib siab: P2=1.0 × 9.8 × 2.5=24.5 kPa
Tsawg- sab siab ntawm qib khoob: P2=1.0 × 9.8 × 2.5=24.5 kPa
Siab- sab siab ntawm qib siab: P1=1.0 × 9.8 × 2=19.6 kPa
Siab- sab siab ntawm qib khoob: P1=1.0 × 9.8 × 2=19.6 kPa =1.0 × 9.8 × 0=0 kPa
Raws li cov qauv: ΔP=Pzoo - Ptsis zoo
Tag nrho qib: ΔP=19.6 - 24.5=-4.9 kPa
Nyob rau theem khoob: ΔP=0 - 24.5=-24.5 kPa
Transmitter qhov ntau yog: -24.5 txog -4.9 kPa
Xaus: Yog vim li cas rau xoom- taw tes tsis zoo tsiv teb tsaws ntawm lub transmitter no yog tias thaum cov kua theem yog 0, tseem muaj -24.5 kPa kua theem siab siv rau qhov tsis zoo siab ntawm lub transmitter.
Hauv cov ntsiab lus: Thaum cov kua theem yog 0, yog ΔP> 0, lub transmitter xav tau kev tsiv teb tsaws zoo; yog ΔP <0, lub transmitter xav tau kev tsiv teb tsaws tsis zoo; yog ΔP=0, tsis muaj kev tsiv teb tsaws chaw.
Cov nyhuv ntawm transmitter installation qhov chaw ntawm cov kua theem
A: Lub dual - flange qib ntsuas ntsuas tau teeb tsa hauv qab kab kab rov tav ntawm qhov qis flange ntawm lub thawv kaw, thiab lub tshuab xa hluav taws xob tau teeb tsa hauv qab kab kab rov tav ntawm qis flange ntawm lub thawv kaw, raws li qhia hauv daim duab hauv qab no.
Xav tias ρnruab nrabyog qhov ceev ntawm qhov nruab nrab=1.5, ρ0yog qhov ceev ntawm silicone roj=0.93, H0Qhov nruab nrab (0-5m), H1 = 1m, H2= 6m, nrhiav qhov ntau ntawm lub transmitter.
Kev daws:
Ntau yam: ΔP=ρnruab nrab × g × H0= 1.5 × 9.8 × 5=73.5 kPa
Siab - siab sab khoob kua theem siab: P(+)=ρ0 × g × H1= 0.93 × 9.8 × 1=9.114 kPa
Tsawg- siab sab khoob kua theem siab: P(-)=ρ0 × g × H2= 0.93 × 9.8 × 6=54.684 kPa
Lub siab sib txawv ntawm cov kua dej khoob: ΔP=P(+) - P(-)=9. 114 - 54.684=-45.57 kPa Siab sib txawv ntawm tag nrho qib: ΔP=Qhov sib txawv ntawm qhov khoob ntawm qib ΔP + Ntau yam nqi ΔP=-45.57 + 73.5=27.93 kPa Transmitter range: -45.57 txog 27.9
B: Lub dual- flange qib ntsuas ntsuas tau nruab rau hauv nruab nrab ntawm kab kab rov tav ntawm flange ntawm lub thawv kaw, thiab lub tshuab xa hluav taws xob tau nruab rau hauv nruab nrab ntawm txoj kab kab rov tav ntawm qhov siab thiab qis flanges ntawm lub thawv kaw, raws li qhia hauv daim duab hauv qab no.
Xav tias ρnruab nrabyog qhov ceev ntawm qhov nruab nrab=1.5, ρ0yog qhov ceev ntawm silicone roj=0.93, H0Qhov nruab nrab (0-5m), H1 = 2m, H2= 3m, nrhiav qhov ntau ntawm lub transmitter.
Kev daws: Ntau yam: ΔP=ρnruab nrab × g × H0= 1.5 × 9.8 × 5=73.5 kPa Siab - siab sab cua theem siab: P(+)=ρ0 × g × -H1=0.93 × 9.8 ×-2=-18.228Kpa Tsawg- siab sab khoob kua qib siab: P(-)=ρ0 ×g × H2=0.93 × 9.8 ×3=27.342Kpa Siab sib txawv ntawm cov kua dej khoob: ΔP=P(+)-P(-)=-18.228-27.342=-45.57Kpa Siab sib txawv ntawm cov kua theem puv: + ΔP 2 tus nqi sib txawv: ΔP ΔP=-45.57+73.5=27.93Kpa Transmitter ntau yam: -45.57 txog 27.93Kpa
C: Lub dual -flange sib txawv siab transmitter yog ntsia saum kab kab rov tav ntawm qhov siab- kawg flange ntawm lub thawv kaw, raws li qhia hauv daim duab hauv qab no.
Xav tias ρnruab nrabyog qhov ceev ntawm qhov nruab nrab=1.5, ρ0yog qhov ceev ntawm silicone roj=0.93, H0Qhov nruab nrab (0-5m), H1 = 6m, H2= 1m, nrhiav qhov ntau ntawm lub transmitter.
Kev daws: Ntau
ΔP = ρnruab nrab × g × H0= 1.5 × 9.8 × 5=73.5 kPa Siab - siab sab cua theem siab: P(+)=ρ0 × g × (-H1)=0.93 × 9.8 ×-6=-54.684Kpa Tsawg- siab sab sab khoob kua qib siab: P(-)=ρ0 ×g ×(-H2)=0.93 × 9.8 ×-1=-9.114Kpa Siab sib txawv ntawm cov kua dej khoob: ΔP=P(+)-P(-){25}}(){7} qib siab sib txawv: Kpa 7.11 ΔP=pas kua theem siab sib txawv ΔP + ntau tus nqi ΔP=-45.57+73.5=27.93Kpa Transmitter ntau yam: -45.57 txog 27.93Kpa
Xaus: Los ntawm cov kev suav sau saum toj no, nws tuaj yeem txiav txim siab tias qhov ntau thiab xoom- taw tes hloov pauv ntawm dual- flange qib transmitter yog tib yam tsis hais nws qhov chaw teeb tsa. Hauv kev teeb tsa tiag tiag, thawj txoj kev teeb tsa raug pom zoo. Lwm ob txoj hauv kev yog ua rau cov roj silicone rov qab, ua rau diaphragm bulging thiab ua rau lub transmitter puas.
Kev Tiv Thaiv Kev Tiv Thaiv
Qhov sib txawv siab ntsuas qib ntsuas tam sim no yog cov khoom siv dav tshaj plaws ntawm cov ntsuas ntsuas ntsuas. Vim yog cov txheej txheem yuav tsum tau ua thiab qee zaum kev lag luam xws li kev txuag ntawm lub siab- ua cov khoom siv yeeb nkab, qhov ntsuas qhov sib txawv ntawm qhov ntsuas siab feem ntau tau nruab rau hauv kev ua haujlwm hnyav. Kev txhim kho kom raug ntawm qib ntsuas thiab siab- ua cov yeeb nkab ncaj qha cuam tshuam qhov tseeb ntawm nws qhov ntsuas.
Yuav kom ua tiav qhov zoo tshaj plaws installation, yuav tsum tau ceev faj hauv qab no:
1. Tiv thaiv lub transmitter los ntawm kev sib cuag ncaj qha nrog corrosive lossis overheated ntsuas xov xwm;
2. Tiv thaiv cov khoom seem los ntawm kev sib sau hauv lub siab-cov yeeb nkab;
3. Lub siab-cov yeeb nkab yuav tsum luv li sai tau;
4. Lub taub hau lub taub hau hauv ob lub siab -cov kav dej yuav tsum sib npaug;
5. Lub siab-cov yeeb nkab yuav tsum tau muab tso rau hauv qhov chaw uas muaj qhov kub thiab txias qis thiab cov av noo hloov pauv, tsis muaj kev cuam tshuam thiab kev co.
Cov hauv qab no tuaj yeem siv los txo qhov yuam kev:
1. Lub siab-cov yeeb nkab yuav tsum luv li sai tau;
2. Thaum ntsuas cov kua los yog chav dej, lub siab -cov yeeb nkab yuav tsum txuas mus rau saum cov txheej txheem piping, nrog ib qho inclination tsis tsawg tshaj li 1/12;
3. Rau kev ntsuas roj, lub siab -cov yeeb nkab yuav tsum tau txuas nrog downwards mus rau cov txheej txheem piping, nrog ib tug inclination ntawm tsis tsawg tshaj li 1/12;
4. Cov txheej txheem ntawm cov kua siab-cov kav dej yuav tsum tsis txhob muaj cov ntsiab lus siab, thiab cov txheej txheem ntawm cov roj siab-cov kav dej yuav tsum zam cov ntsiab lus qis;
5. Ob lub siab -cov kav dej yuav tsum tau khaws cia ntawm qhov kub thiab txias;
6. Txhawm rau kom tsis txhob muaj kev cuam tshuam ntawm kev sib txhuam, txoj kab uas hla ntawm lub siab -cov yeeb nkab yuav tsum loj txaus;
7. Yuav tsum tsis muaj roj nyob rau hauv lub siab -cov yeeb nkab uas muaj kua;
8. Thaum siv cov kua dej sib cais, cov kua theem hauv ob lub siab -cov kav dej yuav tsum yog tib yam.
Common Fault Analysis
1. Cov kua dej loj hloov pauv
* Kev hloov pauv loj hauv nruab nrab lossis hnyav vaporization;
* Thaiv nyob rau sab sauv lossis qis dua -cov kav dej;
* Kev puas tsuaj rau lub raj capillary ua rau nruab nrab to;
* Kev puas tsuaj rau lub diaphragm;
* Tshaj kub tracing kub.
2. Tsis muaj kev hloov pauv hauv cov zaub: Lub qhov hluav taws xob valve tsis qhib lossis cov kab siab raug thaiv; lub teeb liab yuam kev tsis raug tso tseg; Circuit Court board yog faulty los yog puas; lub diaphragm puas lawm; qhov zoo thiab tsis zoo capillaries yog ib txhij nyem, ua rau txhaws lossis puas tsuaj rau cov kav dej.
3. Qhov siab tshaj plaws (tsawg kawg) qhia: Cov kua dej cais tawm ntawm qhov qis - siab (siab- sab siab) yog to; lub diaphragm puas lawm; lub capillary puas lawm; lub siab valve ntawm qis- sab siab (siab- sab siab) tsis qhib lossis raug thaiv.
4. Kev taw qhia siab dhau (tsawg dhau): Lub siab valve ntawm qhov qis - siab siab (siab- sab siab) tsis qhib txaus; lub vent plug yog to; qhov ntsuas kev tsiv teb tsaws tsis raug xam, qhov kev teeb tsa tsis raug teeb tsa kom raug, lossis lub ntsuas ntsuas tsis raug ntsuas kom raug.
5. Tsis muaj qhov taw qhia: Cov kab teeb liab yog xoob lossis muaj kev sib txuas tsis zoo; lub zog fuse yog tshuab; qhov thaiv kev nyab xeeb puas lawm; lub Circuit Court board puas lawm.
