Steel enclosures stand up to hazardous, industrial environments

Dec. 8, 2016
The newest enclosures in Weidmuller’s Klippon Terminal Box series can be used in explosive atmospheres like those in oil-and-gas, petrochemical, nuclear and wastewater industries.

Weidmuller recently expanded its Klippon Terminal Box (TB) range of hazardous-area steel enclosures by introducing three new versions: Multi-Hinge (MH), Quarter-Lock (QL), and Fixed-Screw (FS). “These new enclosures feature a range of approvals that include cULus, AEx, ATEX and IECEx ratings, making them suitable for use in Class 1/Division 2 and Class 1/Zone 0, 1, 2, 20, 21 and 22,” Weidmuller explained. “These enclosures comply with the latest, stricter requirements covering equipment for use in potentially explosive atmospheres, making them ideally suited for harsh environment applications in oil-and-gas, petrochemical, nuclear and wastewater industries.”

The Klippon TB MH, QL, and FS enclosures share a number of design features that their manufacturer says contribute to high performance in harsh-environment applications; they include ingress protection ratings of IP66/67 along with NEMA 3, 4X and 12. Plus, extended heat-and-cold stability testing have been administered to document the enclosures’ ability to withstand temperature extremes—155 deg. C/311 deg. F for 336 hours and -65 deg. C/-85 deg. F for 24 hours.

“For cable-entry flexibility, each enclosure is equipped with up to four gland plates that are secured with M6 hex-head screws,” Weidmuller added. “A silicone gasket is standard to ensure the enclosures are suitable for use in temperature extremes, ranging from -76 deg. F to + 275 deg. F [-60 deg. C to +135 deg. C]. Impact- and corrosion-resistant, these enclosures can also be used in environments that are exposed to salt air. A grounding stud on the cover and base conforms to the most recent standards, and the base grounding stud can be replaced in case of damage. The enclosures are made of 316L stainless steel with a protective electro-polished finish. The Klippon enclosure series of MH, QL, and FS are available in 12 sizes and standard depths of 5, 6, and 8 inches.”

The MH enclosure’s multi-hinge characteristic makes it flexible, the company said. Users choose which side the lid hinges by moving the padlock tab to allow for the reversal of lid opening (left-to-right or right-to-left). The cover locking mechanism is located outside the sealed zone to prevent interference with the seal.

The QL range’s quarter-locking cover requires a keying tool to open it, which prevents accidental opening as well as intrusion.

The FS enclosure’s non-hinged, fixed-screw cover is ideal for applications where space is not conducive to lid clearance when opened, Weidmuller pointed out.

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