Wago 750-439/040-000 8DI NAMUR Exi Extreme

Why Choose the WAGO 750-439/040-000 NAMUR Digital Input Module?

The WAGO 750-439/040-000 is an industrial-grade 8-channel NAMUR digital input module designed for the WAGO I/O System 750 XTR. It allows PLCs and automation controllers to safely monitor signals from NAMUR sensors and intrinsically safe field devices operating in hazardous environments such as chemical plants, refineries and process industries.

The module records binary signals from sensors located in Zone 0 and Zone 1 hazardous areas. NAMUR proximity sensors, optocouplers and mechanical contacts can be connected via intrinsically safe circuits, enabling secure signal acquisition within explosive atmospheres. The module itself must be installed in Zone 2 or non-hazardous areas as part of the WAGO I/O System 750 XTR platform. :contentReference

Each sensor receives a short-circuit-protected 8.2 V supply, while integrated diagnostics detect faults such as wire breaks or short circuits. The XTR version provides extended environmental durability, including enhanced immunity to electromagnetic interference, vibration and temperature extremes, making it suitable for harsh industrial installations. :contentReference

Key Advantages

• Specialised 8-channel NAMUR digital input module for hazardous environments.
• Compatible with NAMUR sensors and intrinsically safe devices.
• Supports monitoring of sensors in Zone 0 and Zone 1 hazardous areas.
• Short-circuit-protected 8.2 V sensor supply on each channel.
• Integrated diagnostics for wire-break and short-circuit detection.
• XTR extreme-environment version with extended temperature capability.

Key Features

• 8 digital input channels.
• NAMUR signal interface.
• 8.2 V DC sensor supply with short-circuit protection.
• High-side switching input characteristic.
• 3 ms digital input filter.
• 2-wire NAMUR sensor connections.
• LED indicators for signal status and diagnostics.
• DIN rail mounted modular design.

Technical Specifications

• Manufacturer: WAGO
• Series: WAGO I/O System 750 XTR
• Model: 750-439/040-000
• Module type: NAMUR digital input module
• Number of inputs: 8 channels
• Signal type: NAMUR
• Sensor supply voltage: 8.2 V DC (short-circuit protected)
• Signal current (0): ≤ 1.2 mA
• Signal current (1): ≥ 2.1 mA
• Input filter: approx. 3 ms
• Switching hysteresis: approx. 0.2 mA
• Input pulse length: ≥ 5 ms
• Sensor connection: 4 × 2-wire sensors
• System supply voltage: 5 V DC via system bus
• Field supply voltage: 24 V DC via power jumper contacts
• Isolation: approx. 300 V between system and field levels
• Connection technology: CAGE CLAMP® spring terminals
• Mounting: 35 mm DIN rail
• Operating temperature: approx. −40 °C to +70 °C
• Protection rating: IP20
• Explosion protection: ATEX / IECEx intrinsically safe Ex i

Hazardous Area Sensor Monitoring

NAMUR sensors are widely used in process industries because they transmit switching states using defined current levels. This operating principle allows safe signal transmission in hazardous environments where electrical energy must be limited to prevent ignition.

The WAGO 750 XTR platform is designed specifically for extreme industrial environments. Its extended temperature range, improved resistance to vibration and enhanced electromagnetic compatibility ensure reliable operation in demanding installations such as offshore platforms, refineries and heavy industrial plants. :contentReference

Typical Applications

• Monitoring NAMUR proximity sensors in hazardous areas.
• Process automation and instrumentation systems.
• Oil and gas production facilities.
• Chemical processing plants.
• Industrial safety and hazardous area monitoring systems.

Trusted by Automation Engineers

WAGO 750 Series I/O modules are widely used by process automation engineers and system integrators to build reliable distributed control systems in demanding industrial and hazardous environments.