Inductive Cylindrical sensors NAMUR Series

Datasensing NAMUR Series

The NAMUR Series delivers specialised inductive metal-detection with intrinsically safe output suited for hazardous areas or where external amplifier modules are used. With thread sizes from M4 up to M30 and shielded or non-shielded versions, these sensors provide reliable detection of metal parts with minimal wiring and simple integration.

Design & Functionality

• Available in a range of sizes (M4, M5, M8, M12, M18, M30) to match different mounting spaces and target-object sizes. 
• Nominal sensing distances vary according to size and mounting (e.g., ~1 mm for small heads, up to ~10 mm or more for M30 versions) enabling flexibility in application. 
• The output is NAMUR-type (change in impedance rather than standard switching) which requires an external amplifier to convert the signal, making it suitable for safety circuits and automation systems in hazardous zones. 
• Both shielded (flush-mount) and unshielded (non-flush) versions are available, enabling choice of mounting depth and interference tolerance. 
• Built for industrial reliability: repeat accuracy is typically < 3 %, hysteresis < 10 %, and operating voltage around 7.7–9 V DC in many models. 

Total Crossed Beams

(In this sensor category, the term corresponds to a consistent magnetic detection field across the active face rather than literal optical beams.)

• The NAMUR Series ensures a uniform sensing zone, enabling reliable detection of metal parts regardless of slight positional or orientation variations—important when used in hazardous or restricted operation areas.
• This leads to repeatable detection performance that supports safety or monitoring systems with minimal false triggers.

Beam Pitch Options

(Here the analogous concept is selectable sensing distances/resolutions rather than beam spacing.)

• Nominal sensing distances include ~1 mm (for finest size), ~5 mm (M18 flush), ~10 mm (M30 flush), depending on model. 
• The sensors offer very high switching frequencies (for example 1 kHz or 500 Hz in larger sizes) and very low residual current when target is absent—supporting reliable performance in dynamic systems. 

Intrinsic Synchronism

• Internal electronics are optimised for NAMUR output: low power consumption when no target (e.g., <1 mA), change in impedance when target present, no external synchronising wiring required beyond the amplifier. 
• Rapid response and minimal delay support integration into fast automation or safety circuits even in restricted or hazardous environments.

Operational Advantages

• Intrinsically Safe Output: The NAMUR interface makes the sensor suitable for hazardous-area installations and systems where external amplifiers are used for signal conditioning.
• Versatility in Mounting & Size: With M4 through M30 thread sizes and shielded/unshielded versions, the NAMUR Series adapts to compact spaces or larger detection fields.
• High Reliability & Precision: With repeat accuracy better than < 3% and consistent detection across metal materials, the sensors yield dependable performance even in harsh conditions.
• Applications: Ideal for automation systems requiring metal object detection with NAMUR output—such as hazardous-area conveyors, intrinsically safe robots, chemical/petrochemical equipment, and general manufacturing where safety, space constraints, and material flexibility are required.