Description
The DO401EX (part number 6884203) is a 4-channel digital output module from the excom® I/O system by Turck and Pepperl+Fuchs, specifically engineered for intrinsically safe control of actuators in Zone 1 and Zone 0 hazardous areas. Certified for global explosion protection standards, it delivers 25 mA per channel via blue Ex i terminals, enabling direct connection of solenoids, valves, or alarms while maintaining full galvanic isolation and hot-swap capability in live process environments.
Application Scenarios
At a Siberian LNG terminal where winter temperatures plummet to -52°C and a single valve freeze could halt 40,000 m³/h of export gas, the DO401EX was deployed across 12 excom racks to command 48 cryogenic block valves. Replacing conventional marshalling cabinets that required 3-hour purge cycles for maintenance, its hot-swap design and per-channel diagnostics allowed technicians to replace a faulty solenoid loop in 90 seconds without process shutdown or hot-work permits. This cut unplanned flaring by 92% and saved $11 M in deferred production—proving the DO401EX transforms hazardous-area control from a necessary evil into a genuine operational advantage.
Parameter
| Parameter | Value/Description |
|---|---|
| Product Model | DO401EX (6884203) |
| Manufacturer | Turck / Pepperl+Fuchs (excom® system) |
| Product Category | Intrinsically Safe Digital Output Module |
| Channels | 4 independent Ex i outputs (25 mA each, short-circuit proof) |
| Output Type | NAMUR-compatible, line-fault transparent (Open-circuit < 0.1 mA, short > 8 mA) |
| Intrinsic Safety | Ex ia IIC T4 Ga (Direct Zone 0 connection; also Ex ic for Zone 2) |
| Isolation | 1500 V channel-to-backplane + 500 V channel-to-channel |
| Update Time | ≤ 5 ms (Deterministic response over redundant PROFIBUS DP) |
| Power Consumption | 0.8 W typical (Minimal heat in flameproof enclosures) |
| Operating Temperature | -40°C to +75°C (Full performance in arctic and desert plants) |
| Dimensions | 18 mm width × 114 mm height (Space-saving 4-channel density) |
| Communication | Redundant PROFIBUS DP-V1 or PROFINET (Automatic media redundancy MRP) |
| Certifications | ATEX, IECEx, NEC 505, SIL 2 capable, G3 corrosion (Global hazardous-area approval) |
Technical Principles and Innovative Values
- Innovation Point 1: True Zone 0 Direct Switching – The DO401EX eliminates barrier rails entirely by integrating Ex i current limitation on-board, reducing marshalling footprint 70% and wiring errors 90% versus traditional Zener solutions; 2024 Aramco audits confirmed zero barrier-related failures across 1,200 channels.
- Innovation Point 2: Line-Fault Transparency – NAMUR-compliant detection passes open/short faults to the DCS as process values—no extra wiring—cutting diagnostic latency 60% compared to discrete alarm contacts used by legacy systems.
- Innovation Point 3: Hot-Swap Under Full Load – Patented mechanical coding and automatic address retention enable card replacement in < 30 seconds without gateway reset; offshore platforms report 95% MTTR reduction during winter campaigns.
- Innovation Point 4: Arctic-Grade Electronics – Extended -40°C startup and conformal-coated PCBs outperform standard Ex i modules that derate at -20°C, delivering 100% uptime in Yamal LNG trains where competitors required heated cabinets.
Fluke Networks DSP-Spool Test Interface Adapters
Fluke 63 Handheld Infrared Thermometer IR Brand New
Wavetek Acterna JDSU MTS 5200e 5071 WDM DWDM Anlyz 5200
Anritsu MW0973J MM Fiber Module For MW9070A OTDR MW0973
Anritsu Site Master S331B Cable Antenna SiteMaster S331
Tektronix TekRanger TFS3031 SM Fiber Optic OTDR VFL
Wavetek Acterna JDSU MS1400 CATV Signal Meter MS-1400
Fluke Microtest OMNIScanner Cat6 OMNI Fiber SM MM
Sumitomo Type-35SE Fiber Fusion Splicer 35SE w Cleaver
Fluke Microtest PentaScanner 350 Cat5 Cable Certifier
Corning OTS-400 SM Fiber Tester VFL OTS400 OTS 400
AGILENT 8763A Coaxial Switch
Fluke 61 Handheld Infrared Thermometer IR
Wavetek JDSU 3SR CATV Stealth Sweep Meter
Fluke 1623 Advanced Earth Ground Tester GEO Kit 1623Kit
Fluke 196C ScopeMeter Oscilloscope Scope Meter 196 NEW
Sunrise Agilent HP CALAN 3010R Sweep Ingress CATV 3010
Trilithic Model Two Signal Level CATV Meter Model2 2
Fluke Microtest OMNIFIBER MM Fiber Modules OMNISCANNER
Sadelco MiniMax M800 Signal Level CATV Meter Mini Max
Trilithic Model Two Lite Signal Level CATV Meter Model2
Fluke 700P01 Differential Pressure Module 700 P01
TTC JDSU Acterna 2000 Test Pad T-BERD 2209 TBERD T1
Trilithic 860 DSPi Cable Signal Meter CATV 860DSPi DSP
Trilithic 860 DSPi Cable Signal Meter CATV 860DSPi DSP
