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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。
PNEUMATIC PRODUCTS 1197941 VALVE REPAIR KIT D591383
PULSAFEEDER K6PTC4 KOPKIT ELECTRONIC SIZE 6 METERING PUMP REPAIR KIT D589032
ALFA LAVAL 481435 C4410-1U PUMP SERVICE KIT D571472
1-1/4IN BORE 12IN OD 5-VANE BRONZE PUMP IMPELLER D574389
TACO EZ09-01-01 1600 SEIRES PUMP REBUILD KIT W/ SC CUPSEAT D574674
MANARAS BRAKE011 BAND BRAKE ASSEMBLY KIT D594913
ENVIROSEAL FI3000RS4000(ESC) SPIRALTRAC GRAPHITE PUMP SEAL D594756
FLOWSERVE 3R4832LI STAINLESS PUMP SEAL PUMP REPAIR KIT D591659
PPC 2384-RG STAINLESS MECAHNICAL PUMP SEAL D591245
FLOWSERVE 3R11416LO-B 3R23035ZX-B PUMP SEAL REPAIR KIT D592854
FLOWSERVE 3R23040ZX PUMP SEAL REPAIR KIT D592855
HK PORTER 0512C BOLT CUTTER REPLACEMENT JAWS D592921
FLOWSERVE TX-56097 EXPLOSION PROOF VALVE POSITIONER D593092
FALK 0268286 6BW BRAKEWHEEL 8 X 2-1/2IN D589537
ROSEMOUNT 2002577 PIPE MOUNTING BRACKET KIT D594024
STONEL QN33P02SDM QUARTZ VALVE MONITORING SWITCH D554215
STONEL QG2WP02SDM QUARTZ VALVE MONITORING SWITCH D554213
HONEYWELL 30756996-501 ST3000 TRANSMITTER CAP ASSY KIT DARK BEIGE D554211
FLOWSERVE DXCLU2PT-18-00200 AUTOMAX VALVE POSITION INDICATOR D528919
FOXBORO BO158LY NON-FLOWING REFERENCE ELECTRODE D596954
SWAGELOK SS-6-RA-4 STAINLESS REDUCING ADAPTER 3/8 X 1/4IN D596890
FLOWSERVE A3R99936-01 PUMP SEAL REPAIR KIT GW16565N4V D597833
36862 5 VANE 8IN OD STAINLESS PUMP IMPELLER D521854
BOSTON GEAR 08414 J150 UNIVERSAL JOINT D531592
METSO RKW-360XZ JAMESBURY BUTTERFLY VALVE REPAIR KIT D555017
YSI 3220 TEMPERATURE PROBE FOR MODEL 3200 D545579
NORTON 38A46-E12VBEP 1740 RPM MAX GRINDING WHEEL 11X5X1 IN D572526
SUDMO 2342559 STAINLESS SANITARY DOUBLE SEAT ACTUATOR 1-6.5BAR D568757
REMOTE CONTROL INC RC30-DA 150PSI PNEUMATIC VALVE ACTUATOR D577542
ASCO 302004 RED-HAT SOLENOID VALVE REBUILD KIT D591241
VIKING 2-476-005-999 PUMP SEAL 1-1/8 IN D564935
ASCO OKC-782 SOLENOID VALVE REPAIR KIT D588473
VANAIRE VA3635 POSITIONER MOUNTING KIT D595291
VIKING 2-476-005-999 PUMP SEAL 1-1/8 IN D564935
ASCO OKC-782 SOLENOID VALVE REPAIR KIT D588473
VANAIRE VA3635 POSITIONER MOUNTING KIT D595291
LMI MILTON ROY 25697 HEAD ASSEMBLY D526525
SWAGELOK SS-V3NBF8-FL TRANSMITTER INSTRUMENT MANIFOLD 6000PSI D557968
ROSEMOUNT 01151-0378-0002 1151-373-1 PRESSURE TRANSMITTER BOARD D545537
PPC R2-175-1-AS ASR-175-2-11 1200S 1-3/4IN MECHANICAL SEAL KIT D541847
PPC R2-162-1-AS ASR-162-2-11 1200S 1-5/8 IN MECHANICAL SEAL KIT D541846
GEORG FISCHER PA40 198-800-728 PNEUMATIC VALVE ACTUATOR D551968
EL-O-MATIC DA 15 PNEUMATIC VALVE ACTUATOR W/ POSITION INDICATOR D582534
DRESSER MLH59046NG3 POPPET VALVE DISC 5.25 IN D580485
FLOWSERVE 3R33014DB SLV BXQ2500 PUMP SLEEVE D584775
SMC JA50-16-150 FLOATING JOINT D584850
BRENNAN N2501-06-04-SS 90DEG HYDRAULIC FITTING 1/4IN NPT D581607
MILLER FLUID POWER 051-KR082-138 HYDRAULIC CYLINDER ROD SEAL KIT D545630
DURAMETALLIC JVBA2750Y33 BRONZE UNITIZED BEARING GARD ASSEMBLY D596126
BAILEY FISCHER PORTER 258521A1 SMART ANALYZER SPARE PARTS KIT D536881
ROSEMOUNT 2 RANGE 5 SIL DP/GP SST SENSOR MODULE D564336
PARKER KT100VP101 VALVE ACTUATOR CYLINDER SEAL KIT D562998
WATTS 0887008 RK 009 CK2 1-1/4-2 2ND CHECK REPAIR KIT D580177
PGI PM 518SCG STAINLESS TWO VALVE MANIFOLD 6000PSI 1/2IN NPT D594588
FLOWSERVE ANXCLU2M1-18-00200 ACCORD POSITION INDICATOR D532199
FLOWSERVE 3R23763DB STAINLESS PUMP SHAFT SLEEVE BXRH3375 D590434
FLOWSERVE 3R11892DB STAINLESS PUMP SHAFT SLEEVE STYLE 2 D590442
EATON 4-SPIRAL-20 1-1/4IN HYDRAULIC HOSE FITTING D590635
FLOWSERVE 3R58829DB STAINLESS PUMP SHAFT SLEEVE D591689
DRILL BIT 2-1/2IN 1155 HSS 02 TAPER SHANK D591930
FLOWSERVE 3R91012DB STAINLESS PUMP SHAFT SLEEVE D592693
LEHIGH K30F RPK-77 PNEUMATIC CYLINDER REPAIR KIT D588804
UNITORQ M-74 K44 DLS PNEUMATIC ACTUATOR D588969
CATERPILLAR CAT 171407-400 SOLAR WIDE DISCHARGE BEARING D594511
HACH SERIES 5000 ANALYZER KEYBOARD COVER D542965
FLOWSERVE 290445XX SECONDARY ROTOR HOLDER D552503
WORCESTER CONTROLS 10E LK39NWD LIMIT SWITCH REPLACEMENT PART D557365
MASONEILAN DRESSER 011477-032-999 ROTARY TRANSFORMER D557330
GENERAL ELECTRIC GE 3IN SHAFT PUMP SEAL D552474
4 IN ID 6-1/2 IN OD STEEL VALVE BALL D523940
GOULDS BH-S3 IRON PUMP POWER END HOUSING D521916
BIBBY TRANSMISSIONS S87150AO1 1-3/8 IN CLUTCH ADAPTER D560584
ACC LA99900A 80:1 1-7/8IN BORE MANUAL ACTUATOR 0-90DEG D560526
WESTINGHOUSE 7-A1-00-A ITI MOVATS SMA1 PUMP SEAL GASKET KIT D557023
FLOWSERVE NXL21000 AUTOMAX ULTRASWITCH VALVE POSITION INDICATOR D557843
MARTIN 38137-4 TORNADO AIR CANNON BB4 EXHAUST VALVE REBUILD KIT D552856
489-57587F 3-VANE 8-1/2 IN OD1-1/4 IN ID STEEL PUMP IMPELLER D538984
MECO CS-2315-KS 3-9/16 IN SHAFT PUMP SEAL REBUILD KIT D558148
WEIR 607881-250 10-1/2IN 2V20951 OPEN 2-VANE STEEL PUMP IMPELLER D553269
METSO LK-1035 NELES-JAMESBURY VALVE ACTUATOR LINKAGE MOUNTING KIT D553302
SPX V011 VALVE STEM PLUG SEAT REPAIR KIT D558531
ASCO VR3C2DAA2NGA VALVE POSITION INDICATOR D553699
ROTEX ECV80SR-26 125PSI PNEUMATIC VALVE ACTUATOR D553491
HONEYWELL 30756996-502 LIGHT BEIGE TRANSMITTER CAP KIT ASSEMBLY D553003
FALK 10037839 281626 61TOOTH 45MM BORE HELICAL GEAR D531278
METSO RKW-359XZ JAMESBURY VALVE REPAIR KIT D553865
WORCESTER 10P 75 WM2120A FLOWSERVE SERIES 75 ELECTRIC VALVE ACTUATOR D556246
9 IN OD 2-VANE 1 IN ID STAINLESS PUMP IMPELLER D535593
M27799 4-VANE 5IN OD 1-1/4IN BORE BRASS PUMP IMPELLER D558499
FALK 0729205 1055G FASTENER SET BOLT COUPLING D559135
SUDMO NO DN50-100 SINGLE SEAT SANITARY STAINLESS ACTUATOR D559072
HONEYWELL 30752770-603 TRANSMITTER MOUNTING BRACKET KIT D554079
23266 4-VANE 9-1/2IN OD BRASS PUMP IMPELLER D536058
Y2884K 4-VANE 8IN OD 1IN ID STEEL PUMP IMPELLER D536285
JOHN CRANE 812255-24N1 3710ALC-VBF385-24 SEAL ASSEMBLY 1-1/2 IN D522007
AESSEAL SAI INTERNAL BALANCED MECHANICAL SEAL 1.375-1 1 D536528
FLOWSERVE 164464-BASE DURA SEAL PUMP SEAL D522714
150BMRV3BX2 7-1/2 IN OD 5-VANE 1-5/8 IN ID STEEL PUMP IMPELLER D536921
API-671 STEEL COUPLING GUARD 5-7/8 IN ID D528896
FLOWSERVE 290447XX ROTOR HOLDER D552502
FLOWSERVE BK00714 REPAIR KIT QBQW 2.375 IN D528831
GEA MF-1-30-O PNEUMATIC VALVE ACTUATOR ASSEMBLY D559870
BALDOR 130059 DODGE 808 T SECTION OIL RING D541580
INGERSOLL RAND 112D440JX1A-20H 61061024 STEEL THROT SLEEVE D525554
SIEMENS 16161-181 UPPER DOOR W/ KEYBOARD D529351
DODGE 133292 SPLIT THRUST COLLAR 4-7/16 IN D541715
3MFL3CX2 7-VANE 9 IN OD BRONZE PUMP IMPELLER D537506
PEERLESS 2655974 1-1/2 X 2 IN NPT STEEL PUMP CASING D537457
R46627 7-VANE 9-3/4IN OD 1-7/16IN ID BRASS PUMP IMPELLER D537452
PPC R1-200-4-AS 1200S 2 IN MECHANICAL PUMP SEAL REPAIR KIT D541833
FH55059 IT-1 B 10584 L-22 C01 011 7-VANE 9-3/4IN OD BRASS PUMP IMPELLER D537448
PPC A1-425-4-AS 1200S 4-1/4 IN MECHANICAL PUMP SEAL REPAIR KIT D541805
PPC ASR-162-2-11 R1-275-4-AS 1200S SPK 1-5/8 IN PUMP SEAL KIT D541827
FLOWSERVE AUTOMAX ULTRASWITCH XL22000 POSITION INDICATOR D560191
7-VANE 8-3/4IN OD BRONZE PUMP IMPELLER 30MM ID D537817
HACH SERIES 5000 ANALYZER KEYBOARD COVER D545699
JOHN CRANE B05771 TYPE 8-1T PUMP SEAL ASSEMBLY 4.125 IN D556357
FLOWSERVE 2115140-5 2115140-4 2.5R091 RUBBER PUMP LINER INSERT D538295
DRESSER 0883 BRASS PUMP OIL RING D523359
KPM GIS-703 SUPERSLEEVE 7.132X8.52X9 IN STAINLESS PUMP SHAFT SLEEVE D563904
HYTORK 185 PNEUMATIC VALVE ACTUATOR 120PSI MAX D560801
DRESSER 060942-004-999 RELAY D570398
DRESSER 060942-010-999 RELAY D570399
DODGE 046363 H322-SNW-315 BEARING ADAPTER D567658
ROSEMOUNT PWB 01151-0306-0001 1151-307-1 TRANSMITTER CONTROL BOARD REV B D571338
M&S PAMS1 PNEUMATIC ACTUATOR D571278
FLOWSERVE B100S10 PNEUMATIC VALVE ACTUATOR D572219
PETER PSV 5003 068118 SHRINK DISC 30NM ASSEMBLY D571369
579494-4252 6-VANE 8IN OD STAINLESS PUMP IMPELLER 7/8IN BORE D572809
PETER PSV 5003 068118 SHRINK DISC 30NM ASSEMBLY D571369
579494-4252 6-VANE 8IN OD STAINLESS PUMP IMPELLER 7/8IN BORE D572809
NORTON 38A46-E12VBEP 1740 RPM MAX GRINDING WHEEL 11X5X1 IN D572523
FISHER 513R SIZE 20 3-15PSI PNEUMATIC DIAPHRAGM ACTUATOR D568595
DRIVE SHAFT 1 X 1-3/16IN BORE 35-1/2IN LENGTH 2-9/16IN OD D568895
WILDEN 02-3880-99 STAINLESS PILOT SLEEVE ASSY D573231
FRISTAM 1802300110 PUMP SEAL KIT D573408
FLOWSERVE PAC-SEAL PUMP SEAL 2-1/2 IN ID D573404
SUDMO 2342559 SANITARY STAINLESS ACTUATOR ED3.1BAR D568763
PARKER L0071823CP SCHRADER BELLOWS SOLENOID VALVE REPAIR KIT D569110
ASCO 164065 RED-HAT II SOLENOID VALVE REPAIR KIT D569104
PACO 91909440 GENUINE PUMP REPAIR GASKET KIT D574363
PACO 91909446 GENUINE PUMP REPAIR KIT D574365
88803356-R1-1 BRONZE PUMP IMPELLER 1-1/4IN BORE 11-9/16IN OD 5-VANE D574382
1-7/8 ID X 11IN OD 7-VANE BRASS PUMP IMPELLER D574375
GRUNDFOS 47U08900 PUMP SEAL & GASKET KIT D574878
FLOWSERVE 25159 140805 DURA SEAL STAINLESS PUMP SEAL 2.125 IN D574992
DRESSER 3 INSTRUMENT MANIFOLD D570394
PEERLESS 8A13 PUMP IMPELLER WEAR RING D586494
JOHN CRANE BF 1D1 TYPE 1 PUMP SEAL KIT 1-15/16 IN D580242
6-VANE 6-15/16IN OD BRASS PUMP IMPELLER D576377
6-VANE 6-11/16IN OD BRASS PUMP IMPELLER D576384
FLOWSERVE B115S07SB15 VALVE ACTUATOR 150PSI D584480
UNITORQ M73K4 PNEUMATIC VALVE ACTUATOR 150PSI D577018
JOHN CRANE B80216 AS7692807-1A TYPE 1 2.25 IN MECHANICAL PUMP SEAL D577524
REMOTE CONTROL INC RC30-DA 150PSI PNEUMATIC ACTUATOR D577939
UNITORQ M295 K4 PNEUMATIC VALVE ACTUATOR D582243
UNITORQ M295 K4 DLS PNEUMATIC VALVE ACTUATOR D582238
FLOWSERVE GESTRA 8471204 UCY36 GM STEAM TRAP CONNECTOR 1/2X1/4IN NPT D579195
8-5/8IN STEEL PUMP IMPELLER 6VANE 1-11/16IN BORE D597316
FLOWSERVE BXRH2250GXCQ BASIC PUMP SEAL D598973
FISHER 1U288846172 M-FORM PLUG D553211
PARKER MIST-X50 DOMNICK HUNTER PNEUMATIC MUFFLER SILENCER D584836
TB WOODS N010-1033 CLUTCH NLS SHOE TYPE A D595548
US SEAL PS-626 PUMP SEAL 5/8 IN D564913
NELES JAMESBURY EW2B 125/250V-AC 15A WATERTIGHT LIMIT SWITCH D565835
PENTAIR 2701901 KV NC DN 25-40 SUDMO STAINLESS ACTUATOR D590131
FISHER SIZE 45-50 DIAPHRAGM D590357
LEHIGH K40F RPK-81 MIRACALUBE PNEUMATIC CYLINDER REPAIR KIT D590310
PARKER 1334451010 AER 2.5-15G-28 3 5K BA HYDRAULIC ACCUMULATOR SEAT D586568
RIDGID 44190 E-1032S F/SS PIPE CUTTER WHEEL D590144
PULSAFEEDER K4PTC1 KOPKIT ELECTRONIC METERING PUMP REPAIR KIT D587374
DRILL BIT 2-7/32IN PTD HS TAPER SHANK D591932
ASCO 322108 REDHAT SOLENOID VALVE REBUILD KIT D587522
1899465 B01697 6 VANE 10IN STEEL PUMP IMPELLER 1-7/8IN BORE D592719
FLOWSERVE 3R4832QI STAINLESS D/BELL ASSEMBLY BXQ2375 D592658
UNITORQ M53K44DLS RACK AND PINION PNEUMATIC VALVE ACTUATOR 150PSI D589066
WILKERSON X06-02-000 PNEUMATIC DESICCANT DRYER 1/4IN NPT D589851
ROSEMOUNT 1 01 TRANSMITTER SENSOR MODULE D543972
MARTIN 38137-4 TORNADO AIR CANNON BB4 EXHAUST VALVE REBUILD KIT D553595
METSO LK-1035 NELES-JAMESBURY VALVE LINKAGE MOUNTING KIT ACTUATOR D553796
9IN OD 4-VANE STEEL PUMP IMPELLER D535647
HONEYWELL 30756996-502 CAP KIT ASSEMBLY LIGHT BEIGE TRANSMITTER D554342
BOSTON GEAR YK-40B 1-1/4IN ROUGH BORE SPUR GEAR D536025
US SEAL PS-626 PUMP SEAL 5/8 IN D564915
FLOWSERVE 612818BH PUMP IMPELLER WEAR RING D586090
INGERSOLL DRESSER 60954765 MECHANICAL PUMP SEAL HEAD D576161
FLOWSERVE 3R25459DB STAINLESS PUMP SHAFT SLEEVE PUMP D583750
FISHER 29A9221X012 VALVE GASKET D581128
OERLIKON 71421180 VACUUM PUMP EXHAUST FILTER CARTRIDGE D584588
METSO H039669 M-L-RELE025/W14-F05/N14 VALVE ACTUATOR LINKAGE KIT D553352
DODGE 132205 6 TO 12 BEARING CIRCULATING OIL GROMMET KIT D565537
ASCO 210-438 SOLENOID VALVE SPARE PART KIT D566462
FISHER 15A6515X012 STAINLESS SEAT RING D563503
ASCO 222641 SOLENOID VALVE REBUILD KIT D583613
3-1/2IN ID STAINLESS ACTUATOR VALVE MOUNTING BRACKET D597538
LINCOLN 81713A CENTRO-MATIC SL-1 150-3500PSI GREASE INJECTOR D598919
VELAN SKSB-F12-SSG SKSB-S14-SSG SB 150/300 BALL VALVE SEAL KIT D600239
METSO H043302 M-L-RELA200/30-F07/35Y LINKAGE KIT D553639
WATTS 59 BFP-RK 0881483 2-1/2IN-3IN RELIEF VALVE SERVICE
