Puas muaj ib txoj hauv kev zoo los txo cov ntsuas tsis raug hauv thermocouples?

Yuav ua li cas peb tuaj yeem txo cov kev ntsuas uas tsis yog uas tsim lub sijhawm thaum siv thermocouples? Firstly, los daws cov teeb meem ntawm kev ua yuam kev, peb yuav tsum nkag siab cov laj thawj tom qab lawv thiaj li ua kom tau qhov teeb meem zoo! Hauv qab no peb yuav txheeb xyuas ntau yam rau qhov yuam kev:

Firstly, cia peb paub meej tias yog Thermocouple Installation yog qhov tseeb. Kev ua tsis raug cai yuav ua rau tsis raug. Ntawm no yog plaub lub ntsiab lus taw qhia rau kev teeb tsa ntawm thermocouples:

1. Lub ntxig ntxig yuav tsum yog tsawg kawg 8-10} sij hawm lub cheeb ntawm cov raj tiv thaiv; Qhov sib txawv ntawm lub tes tsho tiv thaiv ntawm thermocouple thiab phab ntsa tsis muaj cov khoom siv rwb thaiv tsev lossis cua txias kom nkag mus rau lub cub tawg. Yog li ntawd, qhov sib txawv ntawm cov kav hlau thermocouple tiv thaiv xws li cov cua rwb thaiv tsev lossis cov huab cua kub los ntawm kev cuam tshuam ntawm kev ntsuas qhov tseeb;

2. Qhov txias kawg ntawm thermocouple yog ib yam nkaus rau cov cua sov lub cev, ua rau qhov ntsuas kub hauv thaj chaw ntsuas kom tau siab dhau;

3. Lub installation ntawm thermocouples yuav tsum zam muaj zog sib nqus thiab hluav taws xob ntau li ntau tau, yog li cov hluav taws xob thiab hluav taws xob cable kom tsis txhob qhia kev cuam tshuam thiab ua rau tsis muaj kev cuam tshuam thiab ua rau tsis muaj kev cuam tshuam dab tsi

4. Thermocouples tsis tuaj yeem ntsia tau rau hauv cov cheeb tsam uas ntsuas nruab nrab tsis tshua pom. Thaum ntsuas qhov ntsuas kub ntawm lub raj siv siv lub raj siv thermocouple, nws yuav tsum tau muab tso tawm tsam cov kev taw qhia ntau thiab tau sib cuag nrog cov roj.
Thib ob, nyob rau hauv kev siv thermocouples, qhov detheration ntawm thermocouple rwb thaiv tsev tseem yog ib qho ntawm cov laj thawj rau qhov yuam kev:

Cov av ntau thiab cov ntsev nyob hauv cov raj tiv thaiv thiab cov hlau hlau tuaj yeem ua rau cov rwb thaiv tsev tsis zoo ntawm thermocouple electrodes thiab rauv phab ntsa, tshwj xeeb tshaj yog thaum muaj kub. Qhov no tsis yog ua rau poob ntawm thermoelectric muaj peev xwm tab sis kuj cuam tshuam, thiab qhov tshwm sim tsis tuaj yeem ncav ntau pua ntawm cov Celst degrees.

Tsis tas li ntawd, yuam kev tshwm sim los ntawm cov thermal tsis kam ntawm thermocouples:

Yog tias muaj hmoov av lossis thee tshauv ntawm lub raj thermocouple tiv thaiv lub raj, nws yuav ua rau muaj kev nce ntxiv hauv thermal kuj thiab tabkaum lub conduction ntawm tshav kub. Lub sijhawm no, kev nyeem ntawv kub yuav qis dua qhov tseeb tus nqi ntawm kev ntsuas kub ntsuas. Yog li nws yog ib qho tsim nyog los khaws cov thermocouple tiv thaiv lub raj.

* Qhov yuam kev tshwm sim los ntawm cov thermal inertia ntawm thermocouple yog raws li hauv qab no:

Cov inertia ntawm thermocouples ua rau cov nqi qhia ntawm lub twj paj nruag rau qhov ntsuas thiab cov thermoelves diam hlau yuav tsum tau siv kom ntau li ntau tau. Vim tias hysteresis, qhov amplitude ntawm kev kub hloov pauv tau pom los ntawm thermocouples yog me dua li ntawm cov cua sov hloov. Yog li txhawm rau txhawm rau ntsuas qhov ntsuas kub, nws yog qhov tsim nyog los xaiv cov ntaub ntawv nrog cov tes tsho tiv no zoo, xws li cov ntaub thaiv tiv thaiv nyias nyias thiab me me sab hauv diameters. Hauv qhov ntsuas kub nrog kev ntsuas siab qhov yuav tsum tau muaj, cov hlau xaim xaim thermococe tsis muaj cov tsho tiv thaiv feem ntau siv.
In summary, we can reduce the measurement error of thermocouples by checking four aspects: the first step is to check whether the thermocouple is installed correctly, the second step is to check whether the insulation of the thermocouple is worn or deteriorated, the third step is to check whether the thermocouple protection tube is clean, and the fourth step is to check whether the error is caused by the thermal inertia of the thermocouple!