pt100
PT100 ua haujlwm txoj haujlwm
Yuav ua li cas nws ua haujlwm: Thaum PT100 ntawm 0 degrees Celsius thaum nws qhov kev tsis kam yog 100 ohms, nws qhov kev tawm tsam yuav nce thaum qhov kub nce los ntawm ze li ntawm cov khaub ncaws. Tab sis kev sib raug zoo ntawm lawv tsis yog tsuas yog sib npaug rau cov kev sib raug zoo, tab sis yuav tsum tau ze rau tus kwv tij.
Platinum ua hauj ntawm kev hloov pauv nrog kev hloov pauv ntawm qhov ntsuas kub:
(T-100) t& xob; / RTI& gt; t& xob;
0& xob; t& xob; 850 ° C Rt = R0 (1 {{4}} Thaum + Bt2)
Rt yog qhov ua haujlwm ntawm t ℃, R0 yog 0 ℃ thaum lub zog ua haujlwm. Tus qauv A, B, coefficient rau kev sim ntsuas. Ntawm no yog cov qauv
DIN IEC751 Coefficient: A=3.9083E-3, B=-5.775E-7, C=-4.183E-12
Raws li Vader mis kom tau txais cov kev tawm tsam yog ntau dua los yog sib npaug li 100 ohms Rt -> t hloov dua siab tshiab mis:
0 ≤ t& xob; 850 ° C t=(sqrt ((A * R0) ^ 2-4 * B * R0 * (R0 - Rt)) - A * R0) / 2 / B / R0
PT100 qhov kub thiab txias yog lub platinum (Pt) ua los ntawm cov ntsuas kub tsis kam, yog qhov zoo tiv thaiv coefficient, cov tsis kam thiab qhov kub thiab txias hloov hauv kev sib raug zoo yog raws li hauv qab no: R = Ro (1 α αT) qhov twg α = 0.00392, Ro (Tus nqi tsis kam) ntawm 0 ℃), T yog Celsius kub. Yog li ntawd, platinum-made ua hauj kub tiv thaiv, kuj hu ua PT100.
1: Vo = 2.55 mA × 100 (1 + 0.00392T) = 0.255 + T / 1000.
2: Thaum ntsuas Vo, tsis txhob cais tawm ib qho tam sim no, txwv tsis pub ntsuas tus nqi yuav tsis tso cai. Kev txheeb xyuas Circuit Court Txij li thaum lub zog dav dav muab ntau qhov chaw, cov khoom siv fais fab yog nrog lub suab nrov, yog li peb siv zener diode ua cov chaw tswj haujlwm, ua lub luag haujlwm ntawm 7.2V zener diode, ua rau 1K resistor thiab 5K variable resistor Cov voltage thiab 6.5V , 5K kuj tsis paub meej resistor ntawm kev hloov kho ntawm transistor tuaj yeem txiav txim siab lub xov tooj cua (collector) ncej tam sim no, thiab peb yuav tsum teeb tsa rau 2.55mA collector tam sim no, ua qhov ntsuas voltage V raws li qhia los ntawm tus xub mus rau 0.255 + T / 1000. Tom qab tsis -inverting amplifier, cov tawm tswv yim tsis kam yuav luag tsis muaj qhov kawg, tab sis kuj tseem ceeb 10 zaug, ua cov zis op opp 2.55 + T / 100.6V Zener diodes xws li lub luag haujlwm ntawm 7.2V zener diode, Peb siv nws hu tawm 2.55V , yog li cov hluav taws xob voltage follower tso zis hluav taws xob V1 kuj yog 2.55V. Tom qab ntawd, qhov tso zis ntawm qhov sib txawv ntawm cov amplifier yog Vo = 10 (V2-V1) = 10 (2.55 + T / 100-2.55) = T / 10, thiab yog hais tias tam sim no chav kub yog 25 ° C, qhov tso zis voltage yog 2.5V Cov. [1]
Nkhaus daim duab qhia
PT100 / PT1000 platinum tsis kam RT nkhaus daim duab
Indexing cov lus ntawm PT100
-50 qib 80.31 ohms
-40 degrees rau 84.27 ohms
-30 qib 88.22 ohms
-20 degrees 92.16 ohms
-10 qib 96.09 ohms
0 degrees 100.00 ohms
10 degrees 103.90 ohms
20 degrees 107.79 ohms
30 qib 111.67 ohms
40 degrees 115.54 ohms
50 degrees 119.40 ohms
60 degrees 123.24 ohms
70 degrees 127.08 ohms
80 degrees 130.90 ohms
90 degrees 134.71 ohms
100 degrees 138.51 ohms
110 degrees 142.29 ohms
120 degrees 146.07 ohms
130 degrees 149.83 ohms
140 degrees 153.58 ohms
150 degrees 157.33 ohms
160 degrees 161.05 ohms
170 degrees 164.77 ohms
180 degrees 168.48 ohms
190 degrees 172.17 ohms
200 degrees 175. 86 ohms
tivthaiv
Cov pt100 kub kom paub cov ntsiab lus yog cov cheebtsam, cov iav ua, cov khoom sib xyaw ua ke hauv mica, uas tau sib cais los ntawm platinum hlau ncig lub moj khaum ceramic, iav cev pob txha, mica ncej thiab tom qab ntawd ua tiav los ntawm cov txheej txheem ua cov txheej txheem nyuaj.
Cov ntawv thov
Kev kho mob, hluav taws xob, kev lag luam, kev ntsuas kub, qhov ntsuas tsis kam thiab lwm yam khoom siv ntsuas kub siab, qhov ntsuas ntawm daim ntawv thov yog dav heev.
Nyias zaj duab xis platinum tsis kam
Zaj Duab xis Platinum Resistance: Platinum yog qhov nti tawm ntawm lub ceramic substrate nrog zaj duab xis tuab ntawm tsawg dua 2 microns los ntawm lub tshuab nqus tsev. Cov coj Ni (lossis Pd) raug tsau nrog lub khob frit thiab laser-tempered los tsim cov zaj duab xis nyias zaj.
Cov Ntsuas Kub Kub
PT100 thermal tsis kam ntawm qhov ntsuas kub thiab kev sib raug zoo ntawm kev hloov pauv ntawm kev tsis kam, tib neeg yuav siv nws rau cov yam ntxwv ntawm kev tshawb nrhiav thiab kev txhim kho thiab tsim cov PT100 RTD ntsuas kub.
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