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网段的最大长度取决于两个因素：隔离（用RS-485中继器）和波特率。但连接具有不同电位的设备是需要隔离。当接地点之间的距离很远时，有可能具有不同的地电位。即使距离较近，大型机械的负载电流也能导致地电位的不同。
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NIB EMERSON ROSEMOUNT 3051S2CD4A2A11A1AM5Q4 SUPERMODULE TRANSMITTER 300S1AAM5
GRECON PS71 POWER SUPPLY 26V, 551632, 581632, QUEL GMBH E275-V075, 581631
AUTRONIC SGA/KL, 09156401025
RUSTRAK RANGER RR2-1258-3
ENDRESS + HAUSER 53H22-EA0B1RB0BBAA 1" FLOWMETER
ROSEMOUNT 300S1AAM5 PRESSURE TRANSMITTER W/ 03151-9005-0001, A182GR 316/316L
3051S1CD3A2B12A1AM5, PICSEAL SCT60.GFE200.0000
ANDERSON INSTRUMENT DIFFERENTIAL LEVEL TRANSMITTER W/ TOP & BOTTOM SENSORS
TD110079000003600, HD120051005, HD110051002
HONEYWELL DM106-0-B-00-0-R-1-00000-00 MULTI-POINT CHART RECORDER DPR100
FOXBORO IDP10-A20B21F-M1 PRESSURE
ANDERSON LD2100550520 TOP-MOUNT
HONEYWELL DM106-0-B-00-0-R-1-00000-000-00 DPR100 100mm 6 CHANNEL
ABB STT04EPS01J3 HANDHELD SMART TRANSMITTER TERMINAL 12VDC,100MA STT04 W/CABLE
ANDERSON LN005121250111
NIB ROSEMOUNT 3051 PRESSURE TRANSMITTER3051CD2A22A1AS2M5K5W/2 SETA3-B1E220-000
INCLUDES 1199MNB10SSSWA0AAL2,1199WNAB4SSSWA0AAL2
ENDRESS HAUSER CLD134-PCS158AA1 SMARTEC-S
ANDERSON SP4070G0050001 HIGH TEMPERATURE REMOTE TRANSMITTER TFP3130051A1070
ANDERSON SP4071G0050001 HIGH TEMPERATURE REMOTE TRANSMITTER TFP3130051A1070
ANDERSON TFP3120051A0000
HONEYWELL STD120-E1H-00000-1C-HC-MB-S2-B7AN PRESSURE TRANSMITTER ST3000
INCLUDES STD120R-A10-00-HC-S2-B0AN
SIEMENS AMS-M431-A5 POWER SUPPLY, TYPE:KSP-M431-5
REPAIRED SYRON K90-24V DOUBLE
FOXBORO REMANUFACTURED 11GM-CS2 TRANSMITTER GAUGE 40-400 PSI, REF. NO 1947791
POWER ONE SPM5B2C1C1K INTERNATIONAL
NIB OMEGA RHCM-10-3-100F
FISHER 1151-0011-0052 SENSOR MODULE 7317293 W/ PIC DP1023.5003.S6, 316L/3MIL
ASME 3 150 01199-0010-0271 235967, 15-0011-0152
LABORATORIO ELETTROFISICO MV/01
NIB FOXBORO IDP10-D20C21F-M1L1 PRESSURE TRANSMITTER 00510781 12.5-42.0VDC 2A0052
NIB VAISALA HMP233A1C0A2EE12A1A3B
REPAIRED SYRON DBA090 DOUBLE BLANK ANALYZER 24VDC
KEPCO JQE15-12M 0-15V 0-12A
POWER ONE SPM5C2A1LINTERNATIONAL
ATAM SYSTEMS PROCESSDATA LOGGER I/N 2360 WITH HOFFMAN A14128CHQRFGW
GIG MODEL G700 POLYTECTOR PORTABLE GAS
HONEYWELL STR12D-21A-1CDDCBA407K-MB.F1C3-814D ST3000
BODY MDL: STR12D-21A-1C0DDCBA407K-00-804D
ROSEMOUNT C1151LT6EA6F22DL4M1C6 ALPHALINE PRESSURE TRANSMITTER, 01151-0702-0001
NIB FOXBORO ELECTRONIC 823DP-I3S1NH1-A TRANSMITTER W/ B0139CZ
ROSEMOUNT 3051 CD2A23A1AB4E5M5 SMART TRANSMITTER W/ 03031-0193-0103 LCD
03031-0332-0003, XXXXX-0761-0023 MODULE 4184226 SIHSD2
FACTORY SEALED AGILENT TECHNOLOGIES G1680-63711 GPIB INTERFACE (82341I)
TOSHIBA RA POWER RAD92-2020 DC POWER SUPPLY 200/220V 5KVA
ANDERSON SP4077G0050001 HIGH
JOHNSON YOKOGAWA YF102-ALSB1A-S3S3-C/FMF/SCT
METSO VALMET HG4A12SH0 PRESSURE TRANSMITTER, 13-60VDC,4-20 MA, 20 KPA
FISHER ELECTRONIC 4211-2 POSITION TRANSMITTER 4-20 MAX, 30VDC
REFURBISHED ROXTEC BTG INSTRUMENTS OCT-2300 PROBE ASSEMBLY 83412775
POWER ONE SPM2A1B4 INTERNATIONAL
ROSEMOUNT 1151LT5SD0B22D PRESSURE TRANSMITTER 45V-DC 0-750 IN-H2O 1151-0011-0052
NIB ROSEMOUNT 1151DP4S12S2E6M4B1 SMART PRESSURE TRANSMITTER 1199CAP11D25A11M0044
INCLUDES 1199RFW11A11A22M0004& 1199RFW11A11A72M0004
NIB ROSEMOUNT 1151DP4S12S1E6M4B1 SMART PRESSURE TRANSMITTER 1199CAP11D25A11
INCLUDES 1199RFW11C11A71M0004& 01199-0516-0003
NIB ROSEMOUNT 1151DP4S12S2E6M4B1 SMART PRESSURE TRANSMITTER 1199CAP11D10A11
INCLUDES (QTY:2) 1199RFW11C11AC1 & ACCESSORIES
ANDERSON INSTRUMENT SR090G058G2100 PRESSURE TRANSMITTER PSIG X10 0/5000PSIG
ROSEMOUNT 1151 SMART PRESSURE TRANSMITTER 1151DP4S12 W/ 01151-0948-0002
7130371, 1151-0011-0042 SENSOR MODULE 1151-0011-0142
ROSEMOUNT MBR25S MASS PROBAR TRANSMITTER W/ MODEL 79 CONNECTION
FOXBORO 823DP-I3S1NM2-M TRANSMITTER W/ B0138RA M/821AL, 823, 827 MED. RNG: 4-20
B0138EA PRESSURE SWITCH, ORIGIN: 2A8928, A182F316
ROSEMOUNT 03031-0059-0002 TEMPERATURE/PRESSURE TRANSMITTER 03031-0761-0022 BASE
PIC SCT80.GFE200.0000 MWP: CLAMP
NIB NEWTON MODEL 4190 IMAGER W/ 8MM LENS 41900700205
FOXBORO E69P-BI1T-RS CURRENT TO AIR
ALLEN BRADLEY 1770-SA DIGITAL CASSETTE RECORDER 120V, 50/60HZ, .55AMP
NIB ROSEMOUNT 1151GP6S12S1E6M4B1 SMART PRESSURE TRANSMITTER 1199CAP11D15A11
1199RFW11A11A21M0004
FOXBORO 870CC-09-P REF. 28954F02 W/ B0138YM
ABB HART 600T EN SERIES PRESSURE TRANSMITTER W/ TRANSDUCER & 2 SENSORS
A3 74-00, 74-01 SENSORS TRANSDUCER 03200264, AISI 316L
POLYSONICS MASTER SERIES MST-P ULTRASONIC DIGITAL FLOWMETER 24VDC MSTP
ALTEK INDUSTRIES CORP. TRANSCAT 4353E LOOP
FOXBORO 821GM-DS1SH2-AM INTELLIGENT TRANSMITTER W/ L0121GT/C 820 TRANSMITTER
820 INTELLIGENT TRANSMITTER, D0135PF2A9501 MATRL 316L
ROSEMOUNT 1151 SMART TRANSMITTER P/N 01151-0934-0004 WITH 4406964 1151-0011-0052
ROSEMOUNT 1151LT5EA0F22DL4, 1151 SMART TRANSMITTER W/ 01151-0667-0001
01151-0934-0204 TRANSMITTER
ABB HART 600T SERIES SMART PRESSURE TRANSMITTER W/ TRANSDUCER & 2 SENSORS
A3 74-00, 74-01 SENSORS TRANSDUCER 98211152, AISI 316L
PARTLOW 51000031 MRC 5000 SERIES RECORDER ONLY 100-240VAC
NIB OMEGA DP41-TC-DC-S2 HIGH
TAYLOR 323T MEDIUM RANGE PNEUMATIC TRANSMITTER W/ 2 316-L
MODEL 323TD00263-10-87
KENT-TAYLOR ABB N-AA 0111021702 DELTAPI N TRANSMITTER NAA 79/90533/188 2"
MONITORQ TELEMETRY RECEIVER MODEL E-60R AUTOGARD TORQUE E-60RX
FOXBORO 821GM-HS1NM1-AM PRESSURE TRANSMITTER REF. 93400366 ORIGIN. 2A9342
ALLEN BRADLEY 1770-SB DATA CARTRIDGE RECORDER 230-0000-02 115V 50/60HZ
APPLIED ELECTRONICS SP-6A META BLOC META L
FOXBORO 823DP-D3S1NM2 PRESSURE TRANSMITTER REF. NO. 90F50817-8A1 ORIGIN. 2A9106
FANCHER & ASSOCIATES R24R-17BH-18-FT
METSO VALMET HG4A12SH0 PRESSURE TRANSMITTER WITH M546197
NIB SCHURTER MEHRWEG-VERPACKUNG D-79346 FERROMATIK MILACRON TASTATUR EL 353
OMEGA RD1616 CHART RECORDER SOURCE 85-300 VAC MFD 9311 SERIAL: N3K8007T
NIB KESSLER ELLIS INT61A1A15X INT61 COUNTER REV. B
ABB TB557F2EB1F04 INSERTION PH/ORP SENSOR 100PSI
OMEGA RD261 PROGRAMMABLE CHART RECORDER RD260 NO. S5F701815
DIGITAL EQUIPMENT DEC POWER SUPPLY H7876-AA , REV B01
HOLADAY INDUSTRIES HI-1500-3B
ETS-LINDREN HOLADAY H-410137
HORTON NIRECO TM130 TENSION
ROSEMOUNT 823DP-I3S1NL2 TRANSMITTER W/ B0139FY E M/821AL,823,827 LOW RNG: 4-20mA
B0138NS SENSOR MODULE ORIGIN: 2A9038 MAT'L: C0-NI
IBG EDDYLINER 11086 PRUFCOMPUTER GMBH 12086 TESTBOX 90-260V 47-440HZ
HONEYWELL STD930 PRESSURE TRANSDUCER 0-30PSI, STD930-A1A-00000-F1D3-3138
ROSEMOUNT 1151 SMART TRANSMITTER 1151GP5S22B1L4
HONEYWELL ST3000 S900 R300 PRESSURE
YSTR94G-11A-4A0/YYYYYYYYY/-1C,MB,TC,ZS-B67M
FISCHER & PORTER 10D14 MAGNETIC FLOWMETER SIGNAL CONVERTER 10D1475CHBE11BBC1
BAILEY BC12611350 DIFF PRESSURE TRANSMITTER 6"H2O W/ 25710006IWG TRANSDUCER 9/39
LOAD CONTROLS PH-3A-HG POWER CELL 460V 4.2A 4-20mA MCP20733
VIATRAN 3505AMSHB PRESSURE TRANSMITTER 0-100PSI 2" CONN. 3505AM6HBA20
ROSEMOUNT 1055-01-10-22 SW VER# 3.30 ANALYZER SOLUCOMP II 115/230VAC
ALNOR APM360 MULTI-PURPOSE METER W/ MODEL: 275
