140XBE10000 Quantum

電磁流量計(jì)流過(guò)勵(lì)磁線圈的電流產(chǎn)生受控磁場(chǎng)，勵(lì)磁波形是電磁流量計(jì)的一個(gè)重要方面，在實(shí)際應(yīng)用中往往會(huì)使用多種勵(lì)磁類型。較為常見(jiàn)的包括直流電流勵(lì)磁、交流正弦波、低頻直流矩形波、三態(tài)低頻直流波、雙頻波和可編程脈沖寬度。

早出現(xiàn)的是直流電流勵(lì)磁，自從19世紀(jì)年以來(lái)就一直在使用，波形為直線，無(wú)極化，但存在有渦電流，目前使用得不多。交流正弦波于20世紀(jì)20年代開(kāi)始使用，早期的商業(yè)應(yīng)用常采用這種勵(lì)磁類型，交流正弦波激化電壓低，很容易受到電磁干擾而且零點(diǎn)漂移嚴(yán)重。

低頻直流矩形波是較為常見(jiàn)的一類勵(lì)磁類型，根據(jù)具體應(yīng)用的具體需求可采用不同的電力線頻率（50 Hz/60 Hz）線圈。低頻勵(lì)磁因?yàn)橛泻愣ǖ姆群头较蚪惶孀兓碾娏?，所以很好?yīng)對(duì)零點(diǎn)漂移這類問(wèn)題，不過(guò)抵抗檢測(cè)液體噪聲的能力較差。

三態(tài)低頻直流波和低頻直流矩形波有些類似，特點(diǎn)是功耗低，占空比為矩形波的一半。雙頻波則以更高的頻率調(diào)制電力線頻率，可以大程度降低檢測(cè)液體的噪聲，不僅零點(diǎn)漂移很低，還能快速響應(yīng)，不過(guò)調(diào)制操作很復(fù)雜，在對(duì)檢測(cè)很嚴(yán)苛的應(yīng)用里才會(huì)使用?？删幊堂}沖使用微處理器控制勵(lì)磁脈沖寬度和頻率，可以完全擺脫檢測(cè)液體噪聲的影響。

不管是那種勵(lì)磁類型，電磁流量計(jì)的勵(lì)磁電流相比其他流量測(cè)量技術(shù)都大得多，幾乎可以覆蓋線路供電式流量計(jì)的所有范圍。

FUJINON HF35HA-1 LENS 1:1/6/35mm

IRONICS IV3234 VME 16 SIO BOARD VM-3234-10

MOTOROLA CompactPCI PROCESSOR MODULE A93429-011 cPCI

ATRICA AT20001 OPTICAL ETHERNET EDGE SWITCH A-2100 AC

LSI LOGIC MegaRAID PCBX520-A2 ULTRA320 CONTROLLER CARD

CELLWARE CELL-AAL1 VME MODULE PULLED FROM CELL-MASTER

CELLWARE CELL-SW4 VME MODULE PULLED FROM CELL-MASTER

TIMA TIMA-1 Rx/Tx TELEPHONY ISA CARD 100-3680-002

ACT TECHNICO TVME712 VME BOARD PN: 3204194G1 REV B

ATRICA AT20057 OPTICAL ETHERNET EDGE SWITCH A-2101 DC

OPTEM (?) MICROSCOPE LENS EXTENDER

RADISYS EPC-3305 CPU BOARD EPC 3305 W/ P-III 500Mhz 6GB

MYLEX DAC960S SCSI to SCSI RAID CONTROLLER

CYCLONE MICROSYSTEMS CVME 965 BOARD WITH SQ08 & SQ42

CYCLONE MICROSYSTEMS CVME 965 BOARD WITH DUAL (2) SQ21

JASPER DPCI204-1022-4-NN DC DPCI 204-1022-4-NN

GILAT AN-3432-10 KU-BAND ODU TRANSCEIVER NJT5051C

CELLWARE CELL-LIF-SO VME MODULE PULLED FROM CELL-MASTER

ERICSSON ROAH 219 102/1 MODULE PULLED FROM BFD CHASSIS

LSI LOGIC LSI21320-IS ULTRA 320 SCSI CONTROLLER

ERICSSON ROHA 219 101/1 MODULE PULLED FROM BFD CHASSIS

JAI CV-S3200 DSP SURVEILLANCE COLOR CCD CAMERA

MAXON DC MOTOR RE 75 + MAXON TACHO 250WATT NEW 279054

GILAT AN-3426-10 KU-BAND ODU TRANSCEIVER MAIN UNIT NEW

ERICSSON ROA 219 651/1 MODULE PULLED FROM BFD CHASSIS

ARTESYN BajaSpan 10000212-00 8 PORT E1 BOARD

ERICSSON PKM 4610 PI DC/DC CONVERTER MINT LOT OF 19

SIEMENS CELLUAR M20 MODEM S30880-88000-A100-1 LOT OF 17

WELLFLEET COMMUNICATIONS SSE 5410 MODULE

DVS GmbH RGB3.1 ClipStationPro PROFESSIONAL VIDEO BOARD

ERICSSON BMR 601 014 PWR MODULE PULLED FROM BFD CHASSIS

TOLLGRADE DIGITEST DWU 900-0230- REV D W/ 900-0217 A 

DVS GmbH PSC1 ClipStationPro PROFESSIONAL VIDEO BOARD

ARTESYN BajaSpan 10001532-01 E1 cPCI PROCESSING BOARD

NUR MACROPRINTERS 27-5027 BRIDGE BOARD 20-5172

RISER BOND 2901B+ CABLE / FAULT LOCATOR

ARTESYN BajaSpan 10000080-06 E1 cPCI PROCESSING BOARD

TAIAN TP01 24VDC PROGRAMMABLE CONTROLLER TP01-14H0S

ALVARION BREEZECOM SU WIRELESS BRIDGE SU-BD 3.8GHz

PULS SL 10 POWER SUPPLY 24Vdc 10A SL10.100

DELL UCS-51 PCI-E SCSI SAS CONTROLLER

LIGHTSAND SAN COMMUNICATIONS BOARD 200-00000-01

COMPAQ 153618-002 20/40GB TAPE 169024-001 EOD006 MINT

ALVARION BREEZECOM SA-10 WIRELESS BRIDGE NBN/SA-10

KONTRON PEP CP6000 CPCI/PICMG PENTIUM M EMBEDDED BLADE

DELL SEAGATE STU42001LW 100/200GB TAPE W/ 4 CARTRIDGES

LIGHTSAND SAN COMMUNICATIONS BOARD 200-00001-00

SUN 540-5694 73GB 10K RPM FC HARD DRIVE DK32EJ-72FC NEW

KONTRON PEP CP330 UNIVERSAL XGA GRAPHICS CONTROLLER

20-00FBA-09 1GB 133MHZ 200 PIN ALPHASERVER MEMORY DIMM

TREND COMMUNICATIONS AURORA 2 TEST SET

WENGLOR 2x REFLECTIVE SENSOR & THROUGH BEAM W/ CABLES

HAND HELD PRODUCTS LASER WAND 256K SCANNER + BASE MINT

DEC VT525 A6 DIGITAL COLOR TERMINAL BASE TESTED VT 525

DATAKINETICS SPCI4/02 SS7 4 PORTS SEPTEL PCI CARD SPCI4

MOTOROLA MVME 334B VME BOARD 01-W3875B MVME334B

DATAKINETICS SPCI4/0E SS7 4 PORTS SEPTEL PCI CARD SPCI4

IMAJE ENR16423 C CPU BOARD CPU MJT S4

7 RiteKom TS3-0155-34S-P1 SINGLE MODE TRANSCEIVERS 155M

TECHNE CYCLOGENE PHC-3 THERMAL CYCLER

YASKAWA CIMR-J7AA20P1 VS mini J7 AC DRIVE 0.1kW

APPLIED MATERIALS MUX COMMUNICATION BOARD 1280127 PCI 

MRV EM2003-2FO AS44694S-M OPTICAL SWITCH MODULE

GILAT KU-BAND ODU TRANSMITTER AN-0692-10 NJT3003TX

CONTROL TECHNIQUES COMMANDER SE SE11200037 AC DRIVE

GRANVILLE-PHILLIPS 316 VACUUM GAUGE CONTROLLER VGC

ROKAR MILITARY GPS RECEIVER SYSTEM

UNAOHM EP 803 SATELLITE FIELD STRENGTH METER EP803B NEW

MOTOROLA MVME162-522A VME BOARD 01-W3960B MVME 162-522A

LOT OF 53 MICRON 1G SDRAM 100MHZ CL2 ECC MT36LSDF12872G

64MB DRAM Memory for Cisco 1841 Router MEM1841-6 NEW

GE UNICOM 92-0001-01C W/ 92-0003-01B 92-0200-01

MOTOROLA FORCE PPC/CPCI-690/1024-700-32 cpci 690/1024

MOTOROLA MVME162-432 01-W3960B MVME 162-432

RAMIX CP944 Layer 2 Ethernet switch P/N 14-2610E00

MOTOROLA / FORCE POWER CORE CPCI 690 256-700-32/PSB

CHAUVIN ARNOUX PROWATT-3 SET W/ 3x CLAMPS & PRINTER

AirSpan WipLL SDA-4S/VLtag PN:09200024 SDA 4

XC-BAND LNA LN-4451-10 SATELLITE COMPONENT P/N LN445110

PowerDsine PD-8012/AC

MOTOROLA MCPN750A cPCI VME BOARD MCP750 01-W3611F

NATIONAL INSTRUMENTS BUS EXPANDER / ISOLATOR GPIB-120A

Johnson Controls Metasys XP-9107 Extension Module

ODIN MEDICAL TECHNOLOGIES AMPS CAT.NO 506A0059-01

SEAGATE HDD 181G SCSI ST1181677LWV 68 PIN

AYDINE DISPLAYS MRI-18L FLAT PANEL DISPLAY

MATROX GENESIS PLUS GPG4N/500/128/1 PCI processor board

Huawei RT-SIC-2FXS Voice Interface Card new in box

OKIDATA 520 521 PRINTHEAD OKI520 50099501 OKI-520

Performance Technologies CPC4411F CompactPCI Blade

FUJINON HF35HA-1B 1:1.6/35mm LENS

LOW NOISE BLOCK DOWN CONVERTER NJR2144HWI LNB LOT OF 50

NIKON EL-NIKKOR 50mm 1:2.8 UNUSED LENS

SCHNEIDER KREUZNACH MAKRO EXTENSION RING SCH 0077-U14

LG NORTEL DSIB GDK-100 I8KB0544-00 CARD NEW IN BOX

GILAT LNB KU-BAND OPTION A AN-3454-10

PD-6524/AC/M - PowerDsine 6524 - switch - 24 ports 

IBM 08L9760 100/200GB LTO-1 Storage Tape

KROHN-HITE 3955 LP BUTTERWORTH DUAL CHANNEL FILTER

Intel NetStructure ZT 5515 Compactpci Board CPCI ZT5515

DATA GENERAL VSC/3I BLADE VSC-3I 005039452

Avocent Equinox PM16-RJ 16port Serial Module

ROKAR MILITARY GPS PAL 230400-7001

EMULEX FC1010459-01 1GB DUAL FIBRE CHANNEL PCI CARD

MOTOROLA MVME BOARD 01-W3580F W / 01-W3186F

AirSpan WipLL SDA-1 BROADBAND WIRELESS SDA 1 09200010

DIGIBOARD DIGICHANNEL BOX DUAL IMAC+ POWER SUPPLY

CISCO OC48/STM16-8SR OC48STM168SR Expansion Module

YASKAWA CIMR-XCAA20P4 VS mini DRIVE SPINDLE

YASKAWA JVOP-121 VS mini 100V SINGLE PHASE 0.4 KW CB

SCHLUMBERGER SI 7705 DATA TRANSMISSION ANALYZER SI7705

APPLIED MATERIALS CCDL PCB 1280224 CARD 4000353

RADVISION L2W-323P Conferecing Unit L2W-323P/8X

C44550 Nikon VCM Amp 3-Axis Motor Amplifier 4S064-050

RADVISION L2W-323 Conferecing Unit L2W-323/4E

APPLIED MATERIALS MPB CARD 4000354 PCB 1280225

ELSA GLORIA SYNERGY-A8 VIVO CARD PN: KJGP2VIVOPAGP

HITACHI OSCILLOSCOPE V1065A V-1065A

NIKON Scanner S202A VME BLADE 4S017-983 EX14C VME-I/F-M

LSI LOGIC DF4000R / DF4000J AC POWER SUPPLY DPSN-540BB

NUDAM ND-6011 HIGH GAIN ANALOG INPUT MODULE

MITSUBISHI Melsec PLC Controller FX-128MR

LIGHTSAND SAN COMMUNICATIONS BOARD 200-00000-02

Nikon NSR-S202A Camera Switcher NVC8-EX-XB

RADVISION L2W-323V Conferecing Unit L2W-323

ORBOTECH SCHUH MOTOR CONTROLLER CARD V2.0

TELEDATA RCPU 11/00 MODULE

KONTRON CTM80-2 REAR I/O T6701AC FOR DT64/CP6010/CP6000

LIGHTSAND SAN COMMUNICATIONS S-155 BOARD 200-00002-01

NUDAM ND-6013 RTD INPUT MODULE 3 CHANNEL

RADVISION MCU-323/20 Conferecing Unit MCU-323

DATAKINETICS DSC100 SERIES MODEL - DSC110A/02

Yamatake Honeywell SDC40 SDC40J C40J8V0AS050D0

KOLLMORGEN ERH-26 200 WATTS REGEN RESISTOR

10 PICOLIGHT PL-XSL-SC-LF3-11 SINGLE MODE TRANSCEIVERS

CLEMESSY ANALYS EQUIPMENT SML 157-01

KONTRON PEP CP602 CPU BOARD FOR CompactPCI SYSTEM CP600

MATROX Gen/pro 721-0201 GP60/F/64/F/64 

LSI Logic Mylex A170-1-32NB AcceleRAID 170 Ultra160 NEW

TOPWARD ELECTRONICS TMV-360A AC VOLTMETER MINT

DALSA CORECO iMAGING X64-AN QUAD ANALOG FRAME GRABBER

SINO SDS2-2MS DIGITAL READOUTS SDS2MS

TELRAD TLV122AA MODULE

WAVETEK 5820A CROSS-CHANNEL SPECTRUM ANALYZER

LIGHTSAND SAN COMMUNICATIONS BOARD 200-00001-01

ORBOTECH SCHUH I/O CONTROLLER CARD V2.2

GILAT LNB LN-5353-10 KU-BAND PART OF AN-3432-10 NEW

DELTA VFD007L21B AC DRIVE VFD-L SERIES 0.75kW