Endress+Hauser CLS16-3E3A1P The Ultimate Compact Limit Switch for Reliable Level Detection

The CLS16-3E3A1P is a non-contact, electronic limit switch based on vibratory fork technology. Its core principle is simple yet highly effective: two tuning forks oscillate at a specific frequency. When the forks become immersed in or covered by a medium (liquid, paste, or powder), the oscillation frequency changes. This shift is detected electronically, triggering a solid-state switching output.

The "3E3A1P" designation indicates a specific configuration: it features a 3-wire DC supply, a PNP normally open (NO) switching output, and a M12 plug connector. This makes it exceptionally easy to install and integrate into modern control systems. The housing is compact, crafted from high-grade stainless steel (316L), ensuring excellent resistance to corrosion, pressure, and mechanical stress.

Key Technical Parameters & Specifications

Technology: Vibrating fork

Output: PNP, normally open (NO)

Supply Voltage: 10...30 V DC (3-wire)

Electrical Connection: M12 plug connector

Process Connection: G½" or 1" NPT thread

Housing Material: Stainless steel 316L

Fork Material: Stainless steel 316L

Process Temperature Range: -40 ... +130 °C (-40 ... +266 °F)

Process Pressure Range: Up to 100 bar (1450 psi)

Protection Rating: IP66/IP67, suitable for harsh and washdown environments.

Applications: Point level detection for liquids, sludges, and powders across industries like chemical, pharmaceutical, food & beverage, and water/wastewater.

Key Advantages & Benefits

Unmatched Reliability: The tuning fork technology is insensitive to variations in density, viscosity, conductivity, or foam. It provides a clear, bubble-proof switching signal, minimizing false alarms.

Extreme Durability: With its all-stainless-steel construction, high pressure and temperature ratings, and robust IP rating, the CLS16-3E3A1P is built to last in abrasive, corrosive, and outdoor installations.

Maintenance-Free Operation: Having no moving mechanical parts that interact with the medium eliminates wear and tear, ensuring long service life and reducing total cost of ownership.

Simple Installation & Setup: The compact design and standard M12 connector allow for quick mounting and wiring. The device is essentially plug-and-play, requiring no complex calibration.

Versatility: A single device can handle a vast array of media—from water to sticky adhesives and granular solids. This universality simplifies inventory management.

Safety: The reliable detection of overfill or dry-run conditions helps prevent costly spills, equipment damage, and process downtime, enhancing overall plant safety.

Conclusion

The Endress+Hauser CLS16-3E3A1P compact limit switch is more than just a level sensor; it is a cornerstone for reliable process control. Its combination of robust vibratory fork technology, rugged construction, and user-friendly design makes it a top choice for engineers seeking a "fit-and-forget" solution for critical point level detection tasks. By ensuring precise and dependable switching signals, it safeguards processes, optimizes operations, and delivers outstanding value over its entire lifecycle.

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