WAGO 750-439 8DI NAMUR Ex i digitale-ingangsmodule

In chemical plants and refineries, engineers rely on the WAGO 750-439 to safely acquire signals from NAMUR sensors in hazardous areas. This 8-channel digital input module is intrinsically safe (Ex i), allowing direct connection to proximity switches and contacts in Zone 0/1 or 2/22 without external isolators. Its CAGE CLAMP® spring pressure connection technology ensures vibration-proof, maintenance-free wiring, while per-channel LEDs provide immediate status indication. The module integrates seamlessly into WAGO 750/753 fieldbus nodes via DIN-rail mounting, delivering robust performance for demanding process automation.

Key specifications

• 8 digital inputs for NAMUR sensors (EN 60947-5-6)
• Intrinsic safety: II 2 G Ex ia IIC T4 Gb, II 2 D Ex ib IIIC T135°C Db
• Sensor supply: 8.2 VDC internal; input current ON >2.1 mA, OFF <1.2 mA
• Fault detection: wire break (<0.15 mA), short circuit (>6.5 mA)
• Channel-to-channel and channel-to-system isolation
• Operating temperature: -20 to +60 °C
• Per-channel green/red status LEDs
• Input delay: typ. 3 ms
• Protection: IP20, DIN-rail (TS 35) mounting

Why choose it

This module simplifies hazardous area wiring by providing intrinsic safety barriers directly at the I/O level, eliminating the need for external isolators. Its CAGE CLAMP® spring pressure connection technology ensures vibration-proof, maintenance-free wiring, while the per-channel LEDs offer immediate status indication for commissioning and troubleshooting.

Ideal use cases

• Monitoring valve positions, level switches, or proximity sensors in chemical plants
• Interfacing with NAMUR sensors in pharmaceutical manufacturing
• Signal acquisition in oil and gas facilities with hazardous areas

Good to know

The module supports 2- or 3-wire NAMUR sensors and provides channel-to-channel, channel-to-system, and channel-to-supply isolation for enhanced safety and reliability. It consumes typically 100 mA from the 24V system supply and is designed for DIN-rail mounting in control cabinets.