?
A20B-2901-0660/?07AA20B-2901-0660/?07A
②環(huán)形通道節(jié)流裝置β值的計(jì)算 ?首先需通過流通面積A來計(jì)算當(dāng)量直徑dV ，然后再計(jì)算β值。流通面積 ?A=π(D2- DC2) /4 ? ? ? ? ? ? ? ?( 8) ? ? ? ? ? ? 式中DC為內(nèi)錐的最大橫截面直徑。當(dāng)量直徑 ? ?dV=( D2- DC2)1/2 ? ? ? ? ? ? （9）直徑比 ? ? βV=dV /D= (D2- DC2) 1/2 /D ? ? （10）③環(huán)形通道節(jié)流裝置的類型ⅰ內(nèi)錐節(jié)流裝置美國Mccrometer公司推出了內(nèi)錐式(V-cone)流量計(jì)(圖3)。這種流量計(jì)的節(jié)流件是一個(gè)懸掛在管道中央的錐形體，它具有以下優(yōu)點(diǎn)：錐體可改善流場(chǎng)，在前直管段僅5~10D的情況下可具有±0.5~1%的準(zhǔn)確度，此外，它的錐體邊緣比孔板耐磨，可以測(cè)比較臟污的流體；但是在結(jié)構(gòu)上存在的三個(gè)缺點(diǎn)：?jiǎn)伪壑五F體，力學(xué)結(jié)構(gòu)不合理；后取壓點(diǎn)易于堵塞；壓損大，僅次于孔板。在我國21世紀(jì)初期，在缺乏充分研究、測(cè)試，沒有標(biāo)準(zhǔn)、規(guī)程的情況下，宣傳過熱，不分場(chǎng)合到處濫用，造成多起嚴(yán)重事故。一個(gè)新傳感器的研發(fā)、推出，必須在應(yīng)用過程中，不斷完善，切忌急于推廣。對(duì)其評(píng)估也應(yīng)依據(jù)科學(xué)試驗(yàn)的數(shù)據(jù)。為改進(jìn)內(nèi)錐節(jié)流裝置的不足，我國近幾年相繼推出了槽道、內(nèi)文丘利、梭式等節(jié)流裝置。
UT 370a V2 GJR2 212600 R2, GJR2212600R002 UT370a V2 Module ABB ?
UT 371a V2 GJR2 212700 R2, GJR2212700R0002 UT371a V2 Interrogation Module ABB ?
UT 372c GKWN000070R1, UT 372c-sR1 UT 372c-sR1 Module ABB ?
UT 373a GJR2 237300 R1 UT373a Module ABB
UT 374c-E HEIE4221331R1, HEIE4221331R0001 UT374c-E Module ABB
UT 375b-E HEIE 421101 R1, HEIE421101R0001 UT375b-E Module ABB
UT 376a-E GJR2 308200 R1, GJR2308200R0001 UT376a-E Module ABB ?
UT 377a-E HEIE 421304 R1, HEIE421304R1 UT377a-E Module ABB ?
UT 378a-E HEIE 420632R1, HEIE420632R0001 UT378a-E Module ABB
UT 378B-E HEIE 420632R1, HEIE420632R0001 UT378B-E Module ABB
UT 4642a EIA 302 398 R121, EIA302398R0121 UT4642a Speed Transducer Module ABB ?
UT 4810a-E EIA302 391 R121 UT4810a-E Module ABB ?
UT 5507a HEIA404926R1, HEIA404926R0001 UT5507a Module ABB ?
UT386B HESG447475R0002 Monitoring module ABB
UT86-2X40C 57287896 Terminal Block ABB ?
UT86-2XB+B 577701B0 Terminal Block ABB ?
UV 7379a-E UV 7379a-E Module ABB
UV5627B-E HEIE420007R0001 Vibration Monitor Unit Analyzer ABB
VD 85-MEM Video Memory Circuit Card ABB ?
VD86 58173975 Video Controller Module ABB ?
VE 93 0775187D VE 93 Power Module ABB ?
VMM01 ETSI Vibration Monitoring Module ABB ?
VT 371b HEIE 310036 R1, HEIE 310036 R1 VT371b Drive Control Unit Module ABB ?
VT 372b HEIE 310038 R1 VT372b Drive Control Unit ABB
VT 374a-E GJR2240400R1, GJR2240400R0001 Simple Drive Control Unit, 2-Fold ABB ?
VV 01 0776103D VV 01 Module ABB ?
VV 03 0776117B VV 03 Module ABB ?
VV 11 0 479 909 VV 11 (VV11) Module ABB ?
WE-EN-99-202-A BRCPBA10PS2QT, BRCPBA10PS022T Interface Module Bailey ?
XB 01 0776040C XB 01 (XB01) Module ABB
XB 370a HEIE 421443 R1, HEIE421443R0001 XB370a Binary Transmitter ABB ?
XB 371a HEIE 421446 R1 XB371a Module ABB ?
XB 381a WDIB771217R0001 XB381a Module ABB ?
XB 8970a HESG 216563 R1, HESG216563R0001 XB8970a Binary Simulation Module ABB ?
XB 8971b HESG 446097 R1, HESG446097R0001 XB8970a Analog Simulation Module ABB ?
XI 01 0776034F XI 01 module ABB ?
XI 91 0775904B XI 91 Module ABB ?
XK 11 0776203B XK 11 Module ABB ?
XK 12 0776204A, 66031-2-0010 XK 12 (XK12) Module ABB ?
XK 15 0776207A, 66037-2-0000 XK 15 Module ABB ?
XK 16 0776208A, 66038-2-0000 XK 16 Module ABB ?
XM 01 0776044J H&B XM 01 Contronic Module ABB ?
XM 02 0776045H XM 02 (XM02) Module ABB ?
XM 03 0776046G XM 03 (XM03) Module ABB ?
XM06B5 1SBP260103R1001 XM06B5-H11.0 Extension Module - Analog I/O ABB ?
XN 01 0776035G XN 01 Module ABB ?
XN 03 XN 03 (XN03) Module ABB ?
XN 05 66032-2-0001 XN 05 (XN05) Module ABB ?
XN 06 0776055D XN 06 Module ABB ?
XN200764P1 Unitrol XN200764P1 Faceplate Module ABB ?
XN200765P1 Unitrol XN200765P1 Faceplace Module ABB ?
XP 01 0776033H XP 01 Module ABB ?
XP 8984a-V1 HESG332065R2 XP8984a-V1 Potentiometer Module ABB ?
XP 8984a-V2 HESG332065R2 XP8984a-V2 Potentiometer Module ABB ?
XP8670A HEIE420696R0001 Compensation Resistor ABB ?
XR 8981 V3 HEIE431105 P1 XR8981V3 Key Module ABB ?
XR 8987A HEIE431105P2 XR8987A Switch Selection Module ABB ?
XS 311a GJR5105300R1 XS311 Insulating Converter Module ABB ?
XT 038B SE 206139 R1 XT038b Module ABB ?
XT 375a-E HEIE 420142 R1 XT 375a-E Module ABB
XT 377 e-E HESG 446624R1 XT 377 e-E Module ABB ?
XT 377D-S GJR2 3205 00 R10, GJR2320500R0010 XT377D Module ABB
XT 378d-E GJR2330300R0010 XT378D-E Module ABB
XT 378E-E HESG446626R0001,HESG446626R1 XT378E-E Module ABB
XT 383a HEIE 421011 R1, HEIE421011R0001 XT383a Module ABB
XT 5522b HEIE421286R1, HEIE421286R0001 XT5522b Module ABB?
XT 5532a HEIE 420780 R1, HEIE420780R0001 XT5532a ABB ?
XT-2190 Maxtor Tape Drive ABB ?
XT-376a HEIE 420158 R1, HEIE420158R0001 XT 376a Buffer Module ABB ?
XT-382b GKWE 001450 R9 XT-382b Power Supply Rack ABB ?
XT8160C-E V1400 HESG332182R1400 Proximity sensor ABB
XT8160C-E V2250 HESG332182R2250 Proximity sensor ABB
XT8160C-E-V0900 HESG332182R0900 Proximity sensor ABB
XU 01 077604 9G XU 01 Module ABB ?
XU 02 0776050C XU 02 Module ABB ?
XU 03 0776205A XU 03 Module ABB ?
XU 04 0776206A XU 04 (XU04) Module ABB ?
XU 12 66036-2-0102/580/581/590 XU 12 Module ABB ?
XU 13 66039-2-3331 XU 13 Module ABB ?
XU 14 XU 14 Module ABB ?
XV 370a-E GJR2 240900 R1, GJR2 240900 R0001 XV370a-E Power Distribution Module ABB ?
XV 371a XV371a Signal Distribution Module ABB
XV 77135 HESG 223040 R1 XV 77135 Module ABB
XV 7715b HESG 446108 R1 XV 7715b Module ABB ?
XV 7717b HESG 446144 R1 XV 7717b Module ABB ?
XV 7718b HESG 446139 R1 XV 7718b Module ABB ?
XV 8152a-E HEIE 210183 R1, HEIE210183R0001 XV8152a-E Indicating Module ABB ?
XV 8972a HEIE 421385 R1, HEIE421385R0001 XV8972a Connector Module ABB ?
XV5628A HEIA404919R0001 Vibration main unit ABB
XV7713b ProControl Unit ABB
XV7717C HESG447027R0001 Procontol Module ABB
XV7723 HESG447027R0001 Procontol Module ABB ?
XX 02 07760320 XX 02 Module ABB ?
YB560103-AP DSQC212 DSQC212 Display Monitor Module ABB
YB560103-BR DSQC232 DSQC-232 Display Module ABB ?
YM110001-SP PFVI101 PFVI101 Power Supply ABB
YPP 110A PC Drive Digital Processor Module ABB ?
YPQ-110A 3ASD573001A5 ULMA I/O Module ABB
YTE 102A YT213001-AA/2 YTE102A Servo Power Module ABB ?
YTE 102B YT213001-BB Servo Power Module ABB ?
YTEA 250-15 YT212001-AF/2 Servo Power Module ABB ?
YTEA 250-8 YT212001-AE/1 Servo Power Module ABB ?
YYE 109A YT212001-AB/4 Power Supply Module ABB ?
YYT 102C YT212001-AK/5 Servo Control Module ABB ?
YYT 102M YT212001-AU/1 Servo Control Module ABB ?
YYT 102N YT212001-AX/2 Servo Control Module ABB ?
YYT 107A YT212002-AD/4 Rectifier Module ABB
ZPX 103a/1 HE602271-983/4 ZPX103a/1 Protection Relay Module ABB
ZT 370b-E GJR2236600R1 ZT370b-E Module ABB ?
ZT 372a-E GJR2 237800 R1, GJR2237800R0001 ZT 372a-E Module ABB
ZT 373a-E GJR2240100R1, GJR2240100R0001 ZT373a-E Time Module ABB
ZT 374a-E HEIA 406630 R1, HEIA406630R0001 ZT374a-E One Shot Module ABB
ZT 374b-E HEIE 421189 R1 ZT374b-E One-Shot Module ABB
ZT 5537a HEIE420605R1, HEIE420605R0001 ZT5537a Module ABB ?
ZT 5538a HEIE 420607 R1, HEIE420607R0001 ZT5538a Module ABB
ZT 5539A 2/Y1 HEIE 420789 R1, HEIE420789R0001 ZT5539A 2/Y1 Module ABB
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