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　　干擾類型通常按干擾產(chǎn)生的原因、噪聲的干擾模式和噪聲的波形性質(zhì)的不同劃分。其中：按噪聲產(chǎn)生的原因不同，分為放電噪聲、浪涌噪聲、高頻振蕩噪聲等；按噪聲的波形、性質(zhì)不同，分為持續(xù)噪聲、偶發(fā)噪聲等；按聲音干擾模式不同，分為共模干擾和差模干擾。共模干擾和差模干擾是一種比較常用的分類方法。共模干擾是信號對地面的電位差，主要由電網(wǎng)串入、地電位差及空間電磁輻射在信號線上感應(yīng)的共態(tài)（同方向）電壓送加所形成。共模電壓有時較大，特別是采用隔離性能差的電器供電室，變送器輸出信號的共模電壓普遍較高，有的可高達(dá)130V以上。共模電壓通過不對稱電路可轉(zhuǎn)換成差模電壓，直接影響測控信號，造成元器件損壞（這就是一些系統(tǒng)I/O模件損壞率較高的原因），這種共模干擾可為直流、亦可為交流。差模干擾是指用于信號兩極間得干擾電壓，主要由空間電磁場在信號間耦合感應(yīng)及由不平衡電路轉(zhuǎn)換共模干擾所形成的電壓，這種讓直接疊加在信號上，直接影響測量與控制精度。

ROPER TYPE 27 PUMP FIGURE 2 F 35
 
NTB 200-230/400-460?V2,7-2,85/1,55-?1,65A 200-260/400-520?V PUMP NF80/4B-11
 
CC COMPANY 1/2 QJJL-25, NNB
 
GOULDS PUMP INC. 8" X 10" CENTRIFUGAL PUMP, NO LABEL
 
BSF STAINLESS STEEL C-FACE ADAPTOR VQPE-A0027, NEW
 
TOKUDA OIL ROTARY 1HP VACUUM PUMP DRP-360II, LABEL
 
2 X 2 & 1/2 X 7 CENTRIFUGAL PUMP HPF BF, WORN LABEL
 
GOULDS 1 1/2 X 2-10 PUMP 3656 W/ 20HP BALDOR MOTOR JMM4106T
 
MTH TOOL CO. 1-5/8"NPT 5/8"DIA HORIZONTAL COUPLED PUMP 141 F SF
 
NEC D27128D LOT OF 4
 
GUSHER 1000GPM CENTRIFUGAL PUMP MODEL PCL4X6-13SEH-B
 
AHLSTROM 101FT 540GPM 1180RPM 4" X 6" CENTRIFUGAL PUMP TLS-10
 
H.O. TRERICE, DIAPHRAM SEAL, M516-03 NEW
 
INERGY AUTOMOTIVE SYSTEMS 1" CD-S STREET ELBOW
 
AHLSTROM-STYLE 6" X 10" CENTRIFUGAL PUMP, NO LABEL
 
AP AURORA PENTAIR PUMP GROUP 1750RPM 6X6X9 344A A1 CENTRIFUGAL PUMP 03-888594
 
AURORA PUMP 872FT 85GPM 3500RPM CENTRIFUGAL PUMP 2 X 3 X 6 CT993 154 23
 
VIKING HEATER PUMP 1" PORTS / 1/8" W-JIC FITTING GG475
 
ROPER GEAR PUMP TYPE 1 FIGURE 2AE54
 
CONTINENTAL 4" ULTRA PUMP 1CL8-CDQ
 
TUTHILL 3/4HP 1725RPM PUMP MOTOR B3083 / 4628L
 
SUNDSTRAND SUNFLO P-2000 HIGH PRESSURE PUMP P2-GJN
 
AHLSTROM 8-VANE PUMP IMPELLER TLN-15 / 0030 / 281012
 
TUTHILL PUMP 6RC1F-RH 105217
 
KAWASAKI PRECISION MACHINERY SCREW PUMP KPM B38-4L5FLTT

BECKER 1420/1700MIN-1 850/850MBAR 25/30M3/H VACUUM PUMP VT4.25 / B1554484
 
GOULDS PUMPS 6.75 IMP. DIA. SIZE 1X2-10 1800RPM 40GPM CENTRIFUGAL PUMP 3196
 
GOULDS 3175 M PUMP POWER END 78-29-0156
 
BRINKMANN PUMPS TAL901S570+001 HIGH PRESSURE IMMERSION PUMP, 150 GPM, NIB
 
CLAMPETTE 2 1/2 X 6 IPS REPAIR CLAMP 330-096 NIB
 
GOULDS PUMPS G&L SERIES STAINLESS STEEL HYDRAULIC 8SHFRM2A0 W/ 5HP WEG MOTOR
 
GOULD 8 X 10 - 20 CENTRIFUGAL PUMP FIG. 3139
 
GE OSMONICS DIAPHRAGM AND SEAL KIT, 428-RA, NEW
 
GARMAN RUPP CAST IRON PUMP SEAL 38272-234 *NEW*
 
MARCH MANUFACTURING MDXT-3 50/60 HERTZ 1/25 HORSEPOWER MAGNETIC DRIVE PUMP, NIB
 
KEEN 3PH 460V 7.5HP SUBMERSIBLE PUMP K4R7M2-43 W/ CONTROLLER 100134
 
* 3/8" FEMALE HOSE BARB ADAPTER * NO PART NUMBER
 
INGERSOLL-RAND 70GPM TYPE 1 1/2CRVH CENTRIFUGAL PUMP 0372-4078
 
SPEARS * 2" YPIJ3 PVCI SOCKET union * 897-020
 
CRANE 1"NPT 150S 300CWP BRONZE BALL VALVE 431
 
2 X 2 1/2 X 7 HPF2G BF PUMP POWER END 78-05-1500
 
CRANE 1"NPT 125 S 200CWP BRONZE BALL VALVE 1
 
PARKER GE-UNF-UN MALE CONNECTOR 24 FLARELESS/SAE-O?RB - EO-12-S
 
REXROTH 1800RPM HYDRAULIC PUMP AA10VS0100DFLR/?31R -PKC62N00, NEW
 
LINCOLN 1/4"NPT 30PSI AIR OPERATED CHASSIS PUMP SERIES F 082716 *NEW NO BOX*
 
GRACO PISTON REGULATOR, 220900 *NEW*
 
Newly listedBELL & GOSSETT CENTRIFUGAL PUMP SIZE 185011
 
INGERSOLL-RAND DIA. 13.625 1175RPM 2000GPM PUMP POWER END SIZE 8CSFL / 8CSFL3BX2


VERSA-MATIC 2" DIAPHRAGM PUMP
 
WARREN RUPP SANDPIPER AIR-POWERED DIAPHRAGM PUMP SB1.DS4A
 
AHLSTROM 130FT 275GPM 1010RPM 4" X 6" CENTRIFUGAL PUMP TLS-10
 
SPIRAX / SARCO * 3X2 125 PSI PRESSURE POWERED PUMP NO BALL * TYPE PP.F
 
GORMAN-RUPP SERIES 10 SELF-PRIMING END SUCTION CENTRIFUGAL PUMP 12B20-B
 
SUZLER 289FT 900GPM 3550RPM 3" X 6" APT 22-3 CENTRIFUGAL PUMP 100029962
 
MANNESMANN REXROTH VARIABLE VANE PUMP 1PV2V4-32/80RW 16VC116A1/5
 
PARKER PRESTOLOK 5/32 - 62-L -4 1/4" TUBE FITTINGS NNB, LOT OF 14
 
WEBSTER HYDRAULIC PUMP 15B1E1A2-R20
 
GORMAN-RUPP 80 SERIES ELECTRIC DRIVEN SUMP PUMP 81 1/4 B3 E 1/3 103470
 
DIA-VAC PUMP M161-AN-AA1 NNB
 
NORDSON HI-FLO TRIM REPLACEMENT PART AA04K *NEW*
 
GOULDS PUMPS XLT-X 3196 PUMP POWER END 4X6-17
 
INGERSOLL RAND 2X1 5X8 VOC 15 CHEINER PUMP W/ RELIANCE ELECTRIC 15 HP MOTOR
 
GOULDS SHAFT SLEEVE 1203 / 75748 NNB
 
GOULDS PUMPS INC. 39FT 200GPM 1150RPM 3X3-13 316SS CENTRIFUGAL PUMP MODEL 3796