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The Delta H range from Design Environmental offers versatile floor-standing temperature and humidity test chambers that are suitable for larger test pieces.

They are available with five internal volumes from 190 litres to 1,550 litres, along with custom options to meet specific requirements.

The external bodywork is a single-shell construction in zinc-coated steel, with a powder-paint finish in toning colours.

The test chamber comprises an all-welded, watertight stainless steel inner liner with a number of shelf supports built into the side walls allowing shelving to be adjustable in the height of the chamber.

A silicone gasket provides an effective seal between the chamber liner and door.

Minimum heat loss is achieved by compacted mineral wall insulation within the chamber wall cavity.

All Delta chambers feature one 50mm dia port in the left-hand wall and one 125mm dia port in the right-hand wall.

One or two axial fans (subject to model) re-circulate air within the chamber work space providing temperature uniformity and stability.

Full access to the chamber is provided by a left-hand hinged door.

The door-catch mechanism ensures an even pressure is maintained on the door seal while still conforming to all EC safety legislation.

Humidity is generated by water evaporation in a separate compartment located at the rear of the working chamber ensuring excellent uniformity and stability in the chamber work space.

A low-maintenance, reliable, solid-state capacitance sensor measures the humidity level in the working chamber.

Weiss Technik UK is part of the Weiss Group, the world’s largest manufacturer of environmental testing equipment and one of four divisions of the Schunk Group. The Weiss Group division brings together environmental simulation technology and climate technology expertise. Solutions are used around the world in research, development, manufacturing and quality assurance.


In 2013, following a combined presence in excess of 55 years, two respected leaders in environmental testing solutions, Weiss Gallenkamp and Design Environmental, merged to form Weiss Technik UK.

Weiss Technik UK employs a team of over 90 staff across three office locations and a manufacturing plant in the United Kingdom and Germany.


Our environmental simulation product range includes Weiss and Vötsch test chambers and rooms for automotive, temperature and climatic, environmental stress screening, corrosion and pharmaceutical stability testing. We also offer sports science rooms, laboratory and industrial ovens and fingerprint development chambers.


We’ve built our long-standing reputation as a trusted supplier of environmental testing products through technological innovation and service excellence.

We supply small-scale bench top environmental chambers through to the largest customised multi-room controlled environment facility.


Our customers include Mercedes F1, Rothamsted Research, Syngenta, BASF, GlaxoSmithKline, PepsiCo, Dunlop, the FBI, Airbus and Bosch.

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