EUCHNER KAS-70-20-S

EUCHNER KAS-70-20-S

EUCHNER KAS-70-20-S

EUCHNER KAS-70-20-S應(yīng)變傳感器工作原理[2~4]
   應(yīng)變效應(yīng)——材料在受外力作用時(shí)，將產(chǎn)生機(jī)械變形，機(jī)械變形會(huì)產(chǎn)生阻值變化，這種因形變而使其阻值發(fā)生變化的現(xiàn)象稱為“應(yīng)變效應(yīng)”
      基本原理——σ=E *ε， ΔR/R = K * ε，其中σ為試件的應(yīng)力，ε為試件的應(yīng)變，E試件材料的彈性模量，ΔR/R電阻變化率，K為靈敏度系數(shù)，一般在1.7—3.6之間
     測(cè)量原理——用應(yīng)變片測(cè)量時(shí)，將其粘貼在彈性體上。當(dāng)彈性體受力變形時(shí)，應(yīng)變片的敏感柵也隨同變形，其電阻值發(fā)生相應(yīng)變化，通過轉(zhuǎn)換電路轉(zhuǎn)換為電壓或電流的變化
     檢測(cè)電路——把應(yīng)變計(jì)的ΔR/R變化轉(zhuǎn)換成電壓或電流變化，通常采用惠斯登電橋電路實(shí)現(xiàn)這種轉(zhuǎn)換，如圖1。根據(jù)傳感器的工作原理, 引起傳感器零點(diǎn)輸出值變化的因素是傳感器工作電路中電阻的變化。傳感器在制造、使用過程中由于哪些因素影響引起傳感器工作電路電阻的變化是所要研究的本質(zhì)問題。
       根據(jù)量子力學(xué)原理[5]，金屬由一群依一定規(guī)則排列原子構(gòu)成，每顆原子均有一層（或多層）由電子組成的外殼。這些在外殼的電子能脫離原子核的吸引力而到處流動(dòng)，是金屬能導(dǎo)電的主要原因。當(dāng)金屬兩端產(chǎn)生電勢(shì)差（即電壓）時(shí)，電子因電場(chǎng)的影響而作規(guī)則的流動(dòng)，是為電流。在現(xiàn)實(shí)中，物質(zhì)的原子排列不可能為完全規(guī)則，因此電子在流動(dòng)途中會(huì)被不按規(guī)則排列的原子打散，是為電阻的來源。
       根據(jù)電阻定律，導(dǎo)體的電阻R跟它的長(zhǎng)度L成正比，跟它的橫截面積S成反比，還跟導(dǎo)體的材料有關(guān)系，其公式為：
                                       R=ρL/S        （1）
EUCHNER KAS-70-20-S
SSP DUO-LOK
DIXON SCVS-8 
HOSE BARB for 1" ID HOSE X 3/4" MALE NPT HEX BODY BRASS FUEL FITTING <Q-HB024
HOSE BARB for 3/4" ID HOSE X 3/4" MALE NPT HEX BODY BRASS FUEL FITTING <Q-HB023
HOSE BARB for 3/4" ID HOSE X 1/2" MALE NPT HEX BODY BRASS FUEL FITTING <Q-HB022
HOSE BARB for 5/8" ID HOSE X 1/2" MALE NPT HEX BODY BRASS FUEL FITTING <Q-HB020
HOSE BARB for 1/2" ID HOSE X 3/4" MALE NPT HEX BODY BRASS FUEL FITTING <Q-HB018
HOSE BARB for 1/2" ID HOSE X 1/2" MALE NPT HEX BODY BRASS FUEL FITTING <Q-HB017
HOSE BARB for 1/2" ID HOSE X 3/8" MALE NPT HEX BODY BRASS FUEL FITTING <Q-HB016
HOSE BARB for 3/8" ID HOSE X 3/8" MALE NPT HEX BODY BRASS FUEL FITTING <Q-HB012
HOSE BARB for 1/4" ID HOSE X 1/4" MALE NPT HEX BODY BRASS FUEL FITTING <Q-HB005
HOSE BARB for 1/8" ID HOSE X 1/8" MALE NPT HEX BODY BRASS FUEL FITTING <Q-HB001
TEFLON THREAD SEAL TAPE PTFE 1" X 520" X 0.040" PLUMBING FREE S&H <025ER05
TEFLON THREAD SEAL TAPE PTFE 3/4" X 520" X 0.040" PLUMBING FREE S&H <024ER05
TEFLON THREAD SEAL TAPE PTFE 1/2" X 1296" X 0.040" PLUMBING FREE S&H <023ER01
TEFLON THREAD SEAL TAPE PTFE 1/2" X 520" X 0.040" PLUMBING FREE S&H <022ER01
TEFLON THREAD SEAL TAPE PTFE 1/2" X 260" X 0.040" PLUMBING FREE S&H <021ER10
1/2" NPT IN-LINE CHECK VALVE BRASS SPRING LOADED INLINE 200 psi  525T03
3/4" Hose Mender 304 Stainless Steel (For 3/4" ID Hose) BREWING <HM105
 SIGHT FLOW INDICATOR 11/2" NPT 316SS JOHN C ERNST 152S L DOUBLE WINDOW <450WH1
ONE BOLT HOSE CLAMP T BOLT STAINLESS STEEL 98~103mm, 3-7/8"~4-1/16"  HC322
ONE BOLT HOSE CLAMP T BOLT STAINLESS STEEL 48~51mm, 1-7/8"~2"  HC312
ONE BOLT HOSE CLAMP T BOLT STAINLESS STEEL 29~31mm, 1-5/32"~1-7/32"  HC307
 SIGHT FLOW INDICATOR 1" NPT 316SS BODY JOHN C ERNST 152S L DOUBLE WINDOW<267WH1
PENBERTHY SF 1F SIGHT FLOW INDICATOR 1" 150 RF FLANGED 316SS BODY <156WH1
 SWAGELOK DIAPHGRAM-SEALED
SANITARY 1"&1-1/2" SOLID END CAP 304 STAINLESS DAIRY BREWING TRI CLOVER <SAN022
SANITARY 1/2"&3/4" SOLID END CAP 316 STAINLESS DAIRY BREWING TRI CLOVER <SAN021
SANITARY 2" SOLID END CAP 304 STAINLESS DAIRY BREWING TRI CLOVER <SAN023
GATE VALVE 1/2" NPT 200 WOG 316 STAINLESS STEEL FACTORY  <303.WH
WELD SPUD 2" 150# 316S/S BREW KEG BREWING KETTLE WELDING SPUD  <WS008
WELD SPUD 1-1/2" 150# 316S/S BREW KEG BREWING KETTLE WELDING SPUD  <WS007
WELD SPUD 1-1/4" 150# 316S/S BREW KEG BREWING KETTLE WELDING SPUD  <WS006
SANITARY PTFE CLAMP GASKET 3/4" TEFLON 450* F DAIRY BREWING TRI CLOVER <SAN012
SANITARY 1/2&3/4 HEAVY DUTY CLAMP 304 STAINLESS DAIRY BREWING TRI CLOVER <SAN001
SANITARY 2" HEAVY DUTY CLAMP 304 STAINLESS DAIRY BREWING TRI CLOVER <SAN003
SANITARY 1&11/2" HEAVY DUTY CLAMP 304 STAINLESS DAIRY BREWING TRI CLOVER <SAN002
HOSE BARB KC NIPPLE 1-1/2
HOSE BARB KC NIPPLE 1-1/4
HOSE BARB (KC NIPPLE) 1" MALE NPT BRASS FOR 1" ID STRAIGHT END HOSE <HB802
HOSE BARB (KC NIPPLE) 3/4" MALE NPT BRASS FOR 3/4" ID STRAIGHT END HOSE <HB801
HOSE BARB (KC NIPPLE) 1/2" MALE NPT BRASS FOR 1/2" ID STRAIGHT END HOSE <HB800
THERMOMETER 3" FACE 6" STEM 150~750F 60~400C 1/2" S/S NPT BACK w/RESET <948P4
4" WYE STRAINER SURE FLOW 150# RF WCB CS BODY 1/8" MESH SCREEN 316 SS <127WH1
QUADRANT BALL VALVE 3/4" NPT 316 SS 2000 CWP FULL PORT LOCKING LEVER <B020WH
2" WYE STRAINER MUELLER 150# RF 316 SS BODY 1/8" MESH SCREEN 316 SS <126WH1
1/2" x 1/4" NPT HEX FEMALE REDUCING union PLATED STEEL HYDRAULIC  <5000-08-04
ONE BOLT HOSE T CLAMP ZINC PLATED 20~22mm, 25/32" ~ 7/8" (qty-10) <HC902x10
ONE BOLT HOSE T CLAMP ZINC PLATED 26~28mm, 1-1/64" ~ 1-7/64" (qty-10) <HC905x10
ONE BOLT HOSE CLAMP T BOLT ZINC PLATED 26~28mm, 1-1/64" ~ 1-7/64"  <HC905
1/4" MALE NPT x 1/2" FEMALE NPT HEX CONNECTOR 316S/S BREWING 016NW
BALL VALVE 4" 150 RF FULL PORT CS/SS McCANNA ACTUATED PNEUMATIC <102WH1
AOP BALL VALVE 1/2" 316SS NPT 3705 WP 1 PC BODY FULL PORT LOCK LEVER <B018WH
APOLLO 86B20701 BALL VALVE 11/2" 316SS SW 1440 CWP 3 PC BODY FULL PORT <B016WH
SHARPE BALL VALVE 3/4" 316SS BUTTWLD 1000 CWP 3 PC BODY FULL PORT LEVER <B015WH
APOLLO BALL VALVE 1/2" 316SS SW 1000 CWP 3 PC BODY STD PORT LEVER <B014WH
APOLLO BALL VALVE 1/2" 316SS SW 1000 CWP 3 PC BODY FULL PORT LEVER <B012WH