Intertec Develops Insulated Outdoor Enclosures

The environmental protection of larger-scale instrumentation installations can by achieved through the use of highly insulated outdoor enclosures from Intertec. The Basic Vario range of wall- or floor-mounting enclosures is manufactured using Intertec's sandwich-construction technique, with GRP (glass-reinforced polyester) skins enclosing a thick layer of insulating foam. The construction technique delivers a thermal conductivity or K value rating of approximately 1.5W/m2K.

This provides an efficient solution for protecting against frost and condensation and/or providing regulated temperature environments for sensitive field instrumentation. As standard, the Basic Vario range provides a rectangular-shaped enclosure in a choice of three standard sizes of 105 x 64,105 x 84 or 105 x 104cm (41.3 x 25.2, 41.3 x 33.1 or 41.3 x 40.9in) - with a depth of 35cm (13.8in). These deliver a range of volumes that sit between the typical upper limits of many field instrument enclosure ranges and the smaller sizes of many outdoor cabinets.

The volumes are large enough to accommodate several field process transmitters, for example, sophisticated analytical instrumentation points, or complex electrical circuitry designs. The construction principles of Basic Vario also mean that Intertec is able to provide custom sizes. The enclosures meet the IP65 ingress protection standard - with Type 4X approval pending - and are fitted with a large hinged door (with or without windows) that provides access to the interior space. Tube and cable entry is flexible and can be made through the rear or any of the four sides.

Intertec's field enclosures have flat exterior surfaces and are also free of any overhanging edges, allowing enclosures to be packed side by side or on top of each other - in situations where space is restricted. The sandwich-construction technique is said to provide strong insulating properties. Insulation efficiency is typically several times more efficient than an enclosure made using single-layer polyester, for instance, and better than a case made of sheet metal, according to Intertec.

Basic Vario's thermal resistance can be enhanced by accessories such as hard foam mouldings that may be drilled to accept tubing to minimise the 'thermal short-cut' effects of the access holes that have to be made. The thick sandwich-construction material used for the walls also allows lightweight equipment to be mounted directly onto it - avoiding the need for mounting rails in some instances. The long fibre-reinforced grades of GRP sheeting employed by Intertec provides great structural strength that almost matches stainless steel - for just a quarter of the weight.

This allows Basic Vario enclosures to accept very high equipment loads. The enclosure surfaces are also highly resistant to weather and the corrosive effects of aggressive chemicals, which makes Basic Vario enclosures suitable for applications in chemical, oil and gas plants.

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