DIAVAC LCLV-40-AC200V

DIAVAC LCLV-40-AC200V

DIAVAC LCLV-40-AC200V

DIAVAC LCLV-40-AC200V其中ρ：制成電阻的材料電阻率；L：繞制成電阻的導(dǎo)線長度；S：繞制成電阻的導(dǎo)線橫截面積，R：電阻值。
    某種材料制成的長1米、橫截面積是1平方米的導(dǎo)線的電阻，叫做這種材料的電阻率。是描述材料性質(zhì)的物理量。國際單位制中，電阻率的單位是歐姆·米。與導(dǎo)體長度L，橫截面積S無關(guān)，只與物體的材料和溫度有關(guān)，有些材料的電阻率隨著溫度的升高而增大，有些反之。
通過上述分析可知，導(dǎo)體電阻變化是引起傳感器不穩(wěn)定的直接原因，而電阻主要有電阻率、導(dǎo)體橫截面積和導(dǎo)體長度決定。
3.2 DIAVAC LCLV-40-AC200V影響電阻率變化的原因分析
       在普通電工學中, 一定材料的電阻率是按常數(shù)來對待的,可是在研究傳感器的時候卻不能把電阻率按常數(shù)來對待。
根據(jù)量子力學[5],金屬的電阻率要隨著電子的散射幾率而變化。電子的散射幾率越大, 材料的電阻率越大。電子散射幾率是主要受溫度、應(yīng)力、壓力、范性形變、材抖的化學成分和材料的組織結(jié)溝等因素的影響。
由于對某種金屬而言材料的化學成分已經(jīng)確定，應(yīng)力、壓力、范性形變的改變本質(zhì)上是改變了金屬內(nèi)部某些組織結(jié)構(gòu)，導(dǎo)致電子散射幾率變化，所以本文主要對引起電子散射幾率變化的溫度和范性形變進行分析。固體受外力作用而使各點間相對位置的改變，當外力撤消后，固體不能恢復(fù)原狀謂之“索性形變”，又稱為“范性形變”。
       金屬范性形變的方式可有以下幾種：孿生、滑移、扭折。
       滑移是金屬晶體范性形變主要的方式，也就是晶體的相鄰部分在切應(yīng)力作用下沿著一定的晶面和一定的晶體方向相對移動。在絕大多數(shù)情況下，金屬以多晶體形式使用。多晶體是由大量稱為晶粒的小晶體組成，每個晶粒的取向與其相鄰晶粒不同，從而使金屬在外力作用下在宏觀上表現(xiàn)為各向同性體。多晶體范性形變時，一個晶粒的變形必須與相鄰各個晶粒的變形相協(xié)調(diào)，否則材料的連續(xù)性將不能保持。理論分析指出，為了使多晶體通過滑移產(chǎn)生連續(xù)性不受破壞的變形，每個晶粒中至少要有五個獨立的滑移系統(tǒng)動作。實驗證明，即使在應(yīng)變很小的情況下，各個晶粒也明顯地在幾個滑移系統(tǒng)上滑移，特別是在靠近晶界的區(qū)域。由于晶粒間界對滑移的阻礙作用，以及多個滑移系統(tǒng)的位錯相互干擾，多晶材料的應(yīng)變硬化速率較大。

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
APOLLO BALL VALVE 1/2" 316SS SW 1500 CWP 3 PC BODY FULL PORT LEVER <B011WH
FLOW-TEK BALL VALVE 1/2" 316SS SW 2200 CWP 3 PC BODY FULL PORT LEVER <B010WH
 BALL VALVE MARWIN 2" 316SS NPT 2400 WOG 3 PC BODY STD PORT LEVER <B009WH
 BALL VALVE WORCESTER 3/4" 316SS NPT 1000 WOG 3 PC BODY STD PORT LEVER <B008WH
 BALL VALVE MARWIN 3/4" 316SS NPT 1000 WOG 3 PC BODY STD PORT LEVER <B007WH
JAMESBURY BALL VALVE 3/4" 316SS TSW 1440 CWP 3 PC BODY STD PORT OVAL HW <B006WH
JAMESBURY BALL VALVE 1/2" 316SS SW 1000 CWP 3 PC BODY FULL PORT LEVER <B005WH
JAMESBURY BALL VALVE 1/2" 316SS FNPT 1200 WOG 3 PC BODY FULL PORT LEVER <B003WH
ONE BOLT HOSE CLAMP T BOLT ZINC PLT 29~31mm 1-5/32" ~ 1-7/32" (qty-10) HC907x10
ONE BOLT HOSE CLAMP T BOLT ZINC PLATED 48-51mm 1-7/8" - 2" (QTY-10)  HC913x10
ONE BOLT HOSE CLAMP T BOLT ZINC PLATED 48-51mm, 1-7/8" - 2"  <HC913
2″ 304 STAINLESS STEEL BAR STOCK THREADED COUNTER SUNK HEX PLUG <SS1609
1-1/2″ 304 STAINLESS STEEL BAR STOCK THREADED COUNTER SUNK HEX PLUG <SS1608
1″ 304 STAINLESS STEEL BAR STOCK THREADED COUNTER SUNK HEX PLUG <SS1606
3/4″ 304 STAINLESS STEEL BAR STOCK THREADED COUNTER SUNK HEX PLUG <SS1605
MARWIN BALL VALVE 1/2" FNPT 3100 WOG 3 PC BODY REDUCED PORT 316SS <B002WH
1/2″ 304 STAINLESS STEEL BAR STOCK THREADED COUNTER SUNK HEX PLUG <SS1604
JAMESBURY BALL VALVE 1/2" 316SS FNPT 1200 WOG 3 PC BODY FULL PORT <B001WH
3/8″ 304 STAINLESS STEEL BAR STOCK THREADED COUNTER SUNK HEX PLUG <SS1603
1/4″ 304 STAINLESS STEEL BAR STOCK THREADED COUNTER SUNK HEX PLUG <SS1602
1/8″ 304 STAINLESS STEEL BAR STOCK THREADED COUNTER SUNK HEX PLUG <SS1601
1-1/2" NPT FOOT VALVE PRIPUMP GOLD PROSPECTING <885M6
BALL VALVE 2" 2000 NPT FP 316SS 2PC BREWING  <159WH
BALL VALVE 1-1/2" 2000 NPT FP 316SS 2PC BREWING  <158WH
PIPE NIPPLE STD 304 STAINLESS STEEL 1/2" X 11/2" <SN221
TEFLON PINK PLUMBERS TAPE PTFE 1/2" X 260" HIGH DENSITY THREAD SEALANT 058ER23
TEFLON TAPE YELLOW GAS LINE PTFE 1/2" X 260" FULL DENSITY THREAD SEALANT 048ER22
1" X 1/8" 150 304 STAINLESS STEEL BELL REDUCER REDUCING COUPLING BREWING <561WH
PLUG SQUARE HEAD 150# 304 STAINLESS STEEL 1/2" NPT BREWING PIPE PLUG  <883WH
PLUG SQUARE HEAD 150# 304 STAINLESS STEEL 1/8" NPT BREWING PIPE PLUG  <880WH
3/4" MALE UNIVERSAL CROWFOOT COUPLING JACK HAMMER AIR HOSE CROWS FOOT <SFM075
ONE BOLT HOSE CLAMP T BOLT ZINC PLATED 149 ~ 161mm, 5-7/8" ~ 6-3/8"  <HC929
THERMOWELL 316ss 1/2" FPT x 6"L x 1/2" MTP PROTECTION TUBE BREWING <285ER20
SWAGELOK SS-1210-4 
SWAGELOK SS-1010-9 
SWAGELOK SS-1010-3 
BALON  LM05361-1/2
TEFLON TAPE w/ NICKEL FOR STAINLESS 1/2" X 260" THREAD SEALANT BREWING <038ER22
1/2" X 1/4" 150 316 STAINLESS STEEL REDUCING COUPLING BREWING  <569WH
1" NPT Lock Nut Cast 316 Stainless Steel With O-Ring Groove BREWING <LN205GROOVE
SIEMENS HIGH EFFICIENCY MOTOR TYPE RGZP 10 HP 230 VOLTS 3505 RPM <623WH
RECEIVER GAUGE CALIBRATED 3-15 PSI AMETEK MED14952-002 PANEL MOUNT NIB <142A4
REES 2.25" RED MUSHROOM PLUNGER HEAVY DUTY PUSH BUTTON SWITCH 600 VAC NIB <214A4
VICTAULIC BUTTERFLY VALVE 2-1/2" 300 PSI BRASS BODY & STEM GROOVED END <783E3
SWAGELOK SS-16-VCR-3-BL