SICK IMX: when inductive sensing gains in range, robustness and versatility

Introduction

In the industrial world, the reliability of proximity sensors is essential. Whether it is to detect a metal part on a production line, to ensure the safety of operators, or to control an automated process, sensors must be accurate, robust, and durable.

Inductive sensors are now an essential technology. The IMX series from SICK stands out for its exceptional range, unprecedented compactness, and durability suited to the most demanding industrial environments.

Operating principle of an inductive sensor

An inductive sensor relies on the creation of an electromagnetic field generated by a coil. When a metallic object (ferromagnetic or conductive) enters this field, the sensor detects a variation and sends out a signal.

Some key concepts to remember:

• Sn (nominal distance): theoretical range indicated by the manufacturer.
• Sr (effective distance): actual value under normal conditions.
• Reduction factors: the range varies depending on the material (steel, stainless steel, aluminium, copper).
• Flush / non-flush mounting: influence of the mounting on the range and detection area.

Key features of the IMX series

The IMX range from SICK pushes the boundaries of traditional inductive detection.

• Extended range: up to 50 mm, which is several times greater than that of conventional sensors.
• Standard formats: available in cylindrical housings M8, M12, M18, and M30.
• Compactness: the possibility of achieving a large range in a smaller sensor → space saving and flexibility.
• Industrial robustness: resistance to oils, coolants, and dusty environments.
• IP68 rating: reliable operation even in extreme conditions.
• Increased lifespan: less mechanical damage, better machine availability.

Comparison with other technologies

• Compared to standard inductive sensors: increased range, improved reliability, reduced downtime.
• Versus capacitive or optical sensors: better tolerance to dust, splashes, and harsh environments.
• Main limitation: detection of metallic materials only, with reduced range for certain non-ferromagnetic metals.

Typical applications of the IMX

The IMX sensors are designed for critical industrial environments:

• Detection of the presence of metallic objects on conveyors.
• Precise positioning in handling and logistics (rail, overhead conveyors, vertical storage).
• End of travel on machine tools or mobile equipment.
• Car factories, railway industry, automated production lines.
• Aggressive zones with oils, coolants, and dust.

Tips for Choosing the Right IMX

Before selecting a model, one must consider:

1. Detection distance suitable for the target and the material.
2. Size and dimensions (M8, M12, M18, M30).
3. Environmental conditions → sealing, oils, vibrations.
4. Electrical connection (cable, M12 connector).
5. Compatibility with existing systems (IO-Link available depending on models).

Limits and points of caution

• Reduced span on aluminium, copper or stainless steel (reduction factors).
• Correct alignment necessary to avoid false signals.
• Higher price than standard sensors, but offset by better longevity.

Conclusion

The IMX series from SICK perfectly illustrates the evolution of inductive detection: greater range, increased reliability, and unmatched adaptability.

Whether it is to increase machine availability, reduce maintenance interventions, or ensure process safety, IMX stands out as a strategic choice for demanding industrialists.