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信号与屏蔽接地
一般要求信号线必须要有的参考地，屏蔽电缆遇到有可能产生传导干扰的场合，也要在就地或者控制室接地，防止形成“地环路”。信号源接地时，屏蔽层应在信号侧接地；不接地时，应在PLC侧接地；信号线中间有接头时，屏蔽层应牢固连接并进行绝缘处理，一定要避免多点接地；多个测点信号的屏蔽双绞线与多芯对绞屏蔽电缆连接时，各屏蔽层应相互连接好，并经绝缘处理，选择适当的接地处单点接点。
5）对变频器干扰的抑制
变频器的干扰处理一般有下面几种方式：
加隔离变压器，主要是针对来自电源的传导干扰，可以将绝大部分的传导干扰阻隔在隔离变压器之前。
使用滤波器，滤波器具有较强的抗干扰能力，还具有防止将设备本身的干扰传导给电源，有些还兼有尖峰电压吸收功能。
使用输出电抗器，在变频器到电动机之间增加交流电抗器主要是减少变频器输出在能量传输过程中线路产生电磁辐射，影响其它设备正常工作。
JOHN CRANE K15600RBA TYPE 604 1-5/8 IN PUMP SEAL D531442
FLOWSERVE B07728-00-03 PUMP GEAR 1-1/8IN ROUGH BORE STEEL D531638
HONEYWELL 51197425-001 TERMINAL ASSEMBLY W/O LP CONVERSION KIT D553560
STONEL QX33B02SDM QUARTZ EXPLOSION PROOF VALVE MONITORING SWITCH D554214
STONEL QX2WB02SDM QUARTZ EXPLOSIONPROOF VALVE MONITORING SWITCH D554212
INGERSOLL RAND 975D4AX3 9-5/8IN ID 10-1/2IN OD PUMP IMPELLER RING D531991
INGERSOLL RAND 12FA6AX1-20H PUMP CASING RING 10-3/8IN ID 11-1/2IN OD D531988
MECO MDS9AWI-488 PUMP SHAFT SEAL KIT D544336
SWAGELOK MSTB4NCT KENMAC INSTRUMENT MANIFOLD 1/2 IN NPT 6000PSI D540467
SWAGELOK MSTB4NAT KENMAC INSTRUMENT MANIFOLD 1/2 IN NPT 6000PSI D540472
HONEYWELL 51205897-501 TRANSMITTER TERMINAL ASSEMBLY W/O LP D554233
WESTLOCK 2007-QTC VALVE ROTARY POSITION MONITOR D528801
METSO RKW-362X2 JAMESBURY REPAIR KIT BUTTERFLY VALVE D554524
SWAGELOK SS-V5NBF8-FL-G INSTRUMENT MANIFOLD 6000PSI 1/2IN NPT D531849
FLOWSERVE 290437 REV B STAINLESS PUMP STATOR HOLDER D550265
JOHN CRANE A48-2750-003 2.750 IN STAINLESS PUMP SEAL D528848
SUDMO D620 2342149 STAINLESS SINGLE SEAT SANITARY VALVE ACTUATOR D559779
SWAGELOK MSTB4NCT KENMAC INSTRUMENT MANIFOLD 1/2 IN NPT 6000PSI D540977
BOX OF 5 FLOWSERVE 312D109CX3C 20K PUMP UPPER RETAINING RING D536998
NEXEN 932700 SE-200 BRAKE OUTPUT DRIVE UNIT 7/8 IN D555574
NELES JAMESBURY LK-582 VALVE LINKAGE KIT D555756
ROSEMOUNT 752F1AGE FOUNDATION TRANSMITTER FIELDBUS REMOTE INDICATOR D555777
489-45357F 6-VANE 9 IN OD BRASS PUMP IMPELLER D537505
MARTIN TS880 20 1-1/2 IN BORE SPUR GEAR D546423
PPC 1200S 3-1/4 IN MECHANICAL PUMP SEAL REPAIR KIT D542106
PPC 0S 2 IN SINGLE SPLIT MECHANICAL PUMP SEAL D541795
VELAN SWING GATE CAGE FOR 12IN CHECK VALVE D550509
FISHER 13B8792X012 03311-0409-0002 MODULE SUBASSEMBLY STANDARD D542070
PARKER 32-UPGRADE ORIGA 32MM BORE 635MM STROKE CYLINDER SERVICE PACK D506831
ALFA LAVAL 770338 700 SERIES TR SHORT VALVE STEM 1-1/2IN STAINLESS D555783
FLOWSERVE 362B144BX1 TAPERED STEEL PUMP SHAFT D526341
GEA 221-112.07 TUCHENHAGEN STAINLESS DOUBLE VALVE DISC D 6IN IPS D560579
PPC AS-175-2-11 1200S 1-3/4 IN MECHANICAL PUMP SEAL REPAIR KIT D542657
PPC AS-200-1-14 1200S 2 IN MECHANICAL PUMP SEAL REPAIR KIT D542662
PPC R1-325-4-AS 1200S 3-1/4 IN MECHANICAL PUMP SEAL REPAIR KIT D542655
PENTAIR MRP-025U-K-D000 PNEUMATIC RACK AND PINION ACTUATOR 120PSI D557075
ASCO 099025 RED HAT II BULLETIN 8210 AC SOLENOID VALVE REPAIR KIT D563804
NEOTECHA AG1 (210-07) FLOW CONTROL VALVE ACTUATOR D578573
WATTS 142 BFP-RK 0881162 RELIEF VALVE PART KIT D579461
WATTS 31 BFP-RK 0881340 FIRST & SECOND CHECK RUBBER PARTS KIT D579456
TYCO MRP-025U-K-S080 KEYSTONE PNEUMATIC RACK & PINION ACTUATOR D582703
APOLLO AD052 N00AA VALVE ACTUATOR 120PSI D579466
AESSEAL AZA13027BTBG001 LABTECTA DOUBLE SEAL BEARING PROTECTOR D586020
PNEUMATIC PRODUCTS 1224575 RETROFIT KIT D579572
FLOWSERVE C60838-00-00 INNER SUCTION BREAKDOWN BUSHING D583234
TRIAC TR500DA PNEUMATIC VALVE ACTUATOR D583244
WATTS 0887006 RK 009 CK1 1-1/4-2 1ST CHECK REPAIR KIT D580169
FLOWSERVE 3R12455DB A/SLV BXRH2125 STAINLESS PUMP SHAFT SLEEVE D583412
JOHN CRANE C37300010260550 C3730000030550 RING KIT STAINLESS PUMP D583368
JOHN CRANE M28719 73 4.750IN SPLIT RING ASSY PUMP D583360
FISHER 19B5403X012 VALVE CONTROLLER HARDWARE SPARE PARTS KIT D583307
INGERSOLL RAND 38054045 PNEUMATIC MUFFLER SILENCER 2IN NPT D583271
DRESSER 250-063-001 STARTING AIR VALVE HEAD D580652
LATTY LATTYGRAF 6940 BRAIDED GRAPHITE PUMP PACKING 20FT 7/8IN D580613
CHESTERTON 221 042631 SIZE 16 2IN SHAFT SPLIT PUMP SEAL KIT D583764
FLOWSERVE 3R0521UD BXR3500 STAINLESS C/BELL ASSEMBLY D583732
PUMP INLET MANIFOLD 8287 1IN NPT D576512
PUMP MIDSECTION INLET MANIFOLD REPLACEMENT PART 3/4IN NPT D576510
PUMP MIDSECTION INLET REPLACEMENT PART 7820 REV F D576533
SULZER 1 TECHLOK SIZE 92 PUMP SEAL RING D584031
PNEUMATIC PRODUCTS 1224575 RETROFIT KIT D583780
FLOWSERVE 250B157CX1-K WATER FLINGER D584479
FLOWSERVE A0K28802-01-01-1 SNA063S06 FCW ACT/BU VALVE ACTUATOR D584449
ANDERSON GREENWOOD M6TVDC-4 TRANSMITTER INSTRUMENT MANIFOLD D577117
DODGE 004124 2-15/16 IN PILLOW BLOCK BEARING HOUSING D577081
PROMINENT 1310-1 SS2 GAMMA/5B LIQUID END COMPLETE D581364
REMOTE CONTROL INC RC30-DA 150PSI PNEUMATIC ACTUATOR D577020
INGERSOLL RAND 175D88ACX1-CARB/NI GRAPHITE PUMP BUSHING D583527
6825 GALLOM PUMP MIDSECTION INLET D576505
FLOWSERVE 156826DB B/SLV BX2375 PUMP SLEEVE D584778
FLOWSERVE 3R27824DB SLV BXRH2250 PUMP SLEEVE D584795
EL-O-MATIC DA 15 PNEUMATIC ACTUATOR 120PSI W/ POSITION INDICATOR D584937
BYRON JACKSON 6027605 UNITED CENTRIFUGAL THROTTLE BUSHING D584973
OERLIKON 71417300 VACUUM PUMP EXHAUST FILTER CARTRIDGE D584656
ITT 08-997-651-002 PUMP SHAFT SLEEVE D584815
CHESTERTON 221 043959 PUMP SEAL SPARE PART KIT SIZE-30 3-3/4IN SHAFT D585168
KAMMER VALVES 360685-KVI VENTILE ASK39 PP,IP,MF ACTUATOR SEAL KIT D578208
JOHNSON CONTROLS D-3153-40 PNEUMATIC DAMPER ACTUATOR D584992
19364 STAINLESS 3-VANE PUMP IMPELLER D581863
ROSEMOUNT C304031220-0000 6000PSI 316SS 1/2IN NPT MANIFOLD D581885
PARKER 202018 REFRIGERATION VALVE BOTTOM ASSEMBLY KIT S4A D577910
COLONIAL 10 AND 12IN FLANGE 150PSI PVC D577598
HANSEN MOTOR OPERATED VALVE SEAL KIT 1-1/4IN D577956
SULZER 5124470 5.12IN OD 8-VANE STEEL PUMP IMPELLER D585554
AESSEAL E514-BTBG001I22-I23 LABTECTA DOUBLE SEAL BEARING PROTECTOR D585974
AESSEAL E509-BTBG001I17-I18 MAGTECTA DOUBLE SEAL BEARING PROTECTOR D586007
DRESSER 300S127AAX1E-K 605648-87 014 STEEL PUMP SHAFT SLEEVE NUT D581870
YAMADA K25-TT REPAIR KIT D578957
WATTS 0881471 19 BFP-RK 2-1/2IN 3IN FIRST CHECK SERVICE KIT D579507
FLOWSERVE A0K28802-01-03-1 SNA085S08 AUTOMAX FCW ACT/BU ACTUATOR 150PSI D588554
CHESTERTON 221 658538 PUMP SEAL KIT SIZE 33.5 SHAFT SIZE 4.1875 D594052
SWAGELOK MSTB4NCT KENMAC INSTRUMENT MANIFOLD 6000PSI TRANSMITTER D541929
ROSEMOUNT 752F1AGE FOUNDATION FIELDBUS REMOTE INDICATOR TRANSMITTER D557118
HONEYWELL 30756124-008 EXPLOSION PROOF REMOTE INDICATOR D553036
FISHER 667 SIZE 30 6-30PSI PNEUMATIC VALVE ACTUATOR D531150
FLOWSERVE B07728-00-03 PUMP GEAR 1-1/8IN BORE STEEL D531636
METSO RKW-361XZ JAMESBURY BUTTERFLY VALVE REPAIR KIT D555019
GRACO 172416 DISPLACEMENT PUMP CYLINDER D549153
HONEYWELL 51197425-001 TERMINAL ASSEMBLY W/O LP CONVERSION KIT D555259
DONALDSON AK-BT ACTIVATED CARBON FILTER ELEMENT D572575
ROTEN 43036736 U2-130-X 2-130-X MECHANICAL PUMP SEAL D574584
REXNORD ZS13 SELF ALIGNING ROLLER BEARING Z SEAL KIT D561079
GOULDS R196-MKM8Z 3196 MAINTENANCE REPAIR KIT 8IN MTI D592219
METSO LK1039 POSITIONER TO ACTUATOR LINKAGE STEEL D553807
HONEYWELL 51197425-502 TRANSMITTER TERMINAL BLOCK ASSEMBLY KIT 5-POS D554249
SWAGELOK MSTB4NAT KENMAC INSTRUMENT MANIFOLD 1/2 IN NPT 6000PSI D540983
WESTLOCK 2007-QTC VALVE ROTARY POSITION MONITOR D530351
REXNORD ZS-13 SELF ALIGNING ROLLER BEARING Z SEAL KIT D561114
POWELL 1523WE 10IN STEEL WEDGE GATE VALVE DISC D564294
FL SMIDTH SSP0042756-1 VALVE ROD BEARING GUIDE ASSEMBLY D564689
DISPOSABLE WASTE SYSTEMS 50053-TV1 PUMP SEAL W/WAVE SPRING D561694
AUTOMAX N150SR FCW6 150PSI PNUEMATIC VALVE ACTUATOR D562232
COPES VULCAN 21240-1 STEEL FLANGED GLOBE VALVE BODY 2 IN 300 D562313
COMPACT H30 SR 2C QUARTER TURN PNEUMATIC ACTUATOR D566244
STONEL QZM2VE2R VALVEPOINT QUARTZ VALVE SENSOR POSITION INDICATOR D563410
FISHER 15A6484X112 PLUG/STEM ASSEMBLY D566758
IECO C4140BOOT SHAFT D566663
DODGE 055931 THERMOCOUPLE TRANSMITTER KIT D567003
EBRO EB10 DOUBLE ACTING PNEUMATIC VALVE ACTUATOR D595101
SPX 188113J STAINLESS SEAT RING D595117
AESSEAL E2161BTPG001I221I231 MAGTECTA-II BEARING PROTECTOR D595288
FLOWSERVE 3R23591DB BXQ2625 STAINLESS PUMP SHAFT SLEEVE D595410
BRAN & LUEBBE 306506 STAINLESS COMPRESSION RING 62MM PN844 D595686
DRESSER D20721-01-35-317-60-E2 6VANE 8-1/2IN IMPELLER 2-3/16IN BORE D595935
MASONEILAN DRESSER FVP110-F1A3N/LC1/BP/EE/FN15 VALVE POSITIONER 20-60PSI D597533
CCS FOOT VALVE REPAIR KIT D597330
FLOWSERVE 3R22857DB PUMP FLANGE BX1375 D598940
FLOWSERVE 3R24423DB PUMP FLANGE BXQ1125 D598916
FISHER DVC6010 FIELDVUE VALVE POSITIONER D598476
FLOWSERVE 65601-BASE SGL INS PTO DURA SEAL STAINLESS PUMP SEAL 1.375 D599718
FLOWSERVE 57640-BASE 7/RO 1375 STAINLESS PUMP SEAL 1.375IN D599720
HYTORK 280 PNEUMATIC VALVE ACTUATOR 120PSIG D599777
UNITORQ M75 K55 90 M-SERIES PNEUMATIC ACTUATOR D599837
HONEYWELL 30756996-501 ST3000 CAP ASSY KIT GLASS LENS DARK BEIGE D555604
METSO LK1039 VALVE POSITIONER TO ACTUATOR LINKAGE STEEL D553806
VANTON W1119-3 230/460V-AC 2HP 1800RPM CENTRIFUGAL PUMP POWER END D536026
TRI CLOVER 761TR-10M-29S-1 1/2-316L TRI-FLO PNEUMATIC VALVE ACTUATOR D555067
WEIR GALIGHER 23974 PUMP IMPELLER 1-1/4IN BORE 10IN OD D561332
6-VANE 6-5/8IN OD BRASS PUMP IMPELLER D576398
