Range Migration Faliure Analysis of Differential Pressure Transmitter

Thaum xaiv peb qhov sib txawv siab transmitters nyiamUPB 5, cov ntaub ntawv hauv qab no tuaj yeem pab txheeb xyuas qhov txhaum ntawm kev tsiv teb tsaws chaw.

1. Positive migration txhaum:

1.1 Kaw lub ntsuas qhov zoo thiab qhov tsis zoo ntawm cov pawg valve, qhib qhov sib npaug ntawm lub valve thiab lub ntsuas qhov ntsaws ntsaws.

Lub sijhawm no, qhov ntsuas ntsuas yuav tsum qis dua 4mA.

Yog tias cov zis tsis qis dua 4mA, nws yuav yog cov hlau lead ntawm lub siab zoo chamber lossis pawg peb-valve yog me ntsis thaiv.

1.2 Tom ntej no, kaw lub siab taw tes ntawm qhov zoo siab chamber, qhib qhov qhib-cua hloov, thiab cov zis yuav tsum yog 4mA nyob rau lub sijhawm no.

Yog tias qhov tso zis qis dua 4mA, nws yuav yog tias qhov kev tsiv teb tsaws chaw me me lossis xoom txoj haujlwm tsawg; yog hais tias cov kua spacer puv, nws yuav yog tias cov kua spacer tsis puv los yog leaked los ntawm sab;

Yog tias qhov tso zis ntau dua 4mA, nws txhais tau hais tias qhov kev tsiv teb tsaws chaw loj dua lossis xoom txoj hauj lwm ntawm sab siab.

2. Negative migration txhaum:

2.1 Kaw cov chav ntsuas qhov zoo thiab qhov tsis zoo ntawm peb-valve pawg ntawm qhov sib txawv ntawm qhov sib txawv, thiab qhib qhov sib npaug valve thiab lub ntsuas cua ntsaws ntsaws, lub ntsuas hluav taws xob yuav tsum yog 20mA.

2.2 Thib ob, kaw cov ntsiab lus siab ntawm lub siab zoo thiab qhov tsis zoo, thiab qhib qhov qhib cua hloov.

Lub sijhawm no, qhov tso zis ntawm qhov ntsuas yuav tsum yog 4mA.

Yog tias nws tsis yog 20mA lossis 4mA, xyuas seb cov kev coj ua ntawm lub siab zoo thiab qhov tsis zoo yog thaiv, seb qhov kev hloov pauv tau hloov pauv thiab qhov xoom txoj haujlwm yog qhov tseeb, seb cov kua dej cais tawm puas ploj, thiab lwm yam.

Yog xav paub ntxiv, thov hu rauStella Meng.