Weiss-Umwelttechnik GmbH

Weiss Product list:

>> Products of Environmental Simulation
>> Temperature & Humidity Test Chambers (also according to ATEX)
>> Environmental Stress Screening System

>> Corrosion and Weathering Test Chambers
>> Rain & Dust Chambers
>> Vacuum Test Chamber

>> Tunnel System
>> Customised test units for special requirements
>> Test Systems for Automotive Industry
>> Control System

Equipment for environmental simulation product testing

Simulation testing attempts to reproduce the circumstances a product would actually experience in the course of operation or transport by road, rail, sea, and air both to provide convincing information as to product reliability and to reveal any problems it might have while still in the development phase – or at the latest before it is shipped from the factory – thus preventing the sorts of complaints and recall actions that incur extraordinarily high costs and cause lasting brand name damage.  During testing, samples are placed in the sealed interior of a test chamber, where they are subjected to extreme environmental loads.

 In thermal test cabinets, samples can be examined at a variety of temperatures over a broad range, from very low (as low as -75 oC), to very high (as high as +180 oC), while they are either at rest or in operation.  The openings on the sides of the chambers allow cables or tubes to be routed into the chamber to facilitate device operation.  Optionally, large view panes and interior lighting may be installed, enabling observation of device function within the chamber.

In both the smaller climate cabinets and large-scale climate chambers constructed on-site, the relative humidity may be varied from 10% to 98% within a temperature range of +10 to +95 oC.  In high-power stress screening chambers, high cooling and heating rates (15 K/min on the high end) make it possible to produce temperature changes at very high speeds.  Even more radical environmental conditions are simulated in thermal shock chambers, where test objects are moved back and forth between a cold interior space (as cold as -80 oC) and a warm one (up to +220 oC).  Temperature and climatic tests may also be combined with UV radiation and mechanical stress testing, in which case the system produces mechanical vibrations and thermal/climatic loads simultaneously, thus modelling the circumstances a product might actually experience during either operation or transport by road, rail, sea, or air.  The conditions associated with various heights above sea level or with space travel may be simulated using vacuum or overpressure chambers.

Weiss also produces corrosion testers that enable the effects of salt fog, aggressive gases, acidic liquids, water spray, rain, etc. to be reproduced.
The company’s most recent development projects include SHED chambers for emissions testing and dust chambers, where dust subject to overpressure can be made to enter the interior of a test object, and the effects of abrasive materials of various particle sizes travelling a high flow rates can be simulated.

Benchtop test units

With the decrease in size of manufactured electronic equipment has come an increased demand for small-sized test equipment that takes up less space and is easier to find room for in the lab, no matter how small.

Because modern equipment is so quiet, such units can even be used in industrial and office environments and are comfortably managed from the top of a worktable or rolling stand.  These machines offer the same test specifications as the industrial thermal test and climate cabinets in a smaller-sized unit.  If, for instance, there is a need in the development laboratory for a quick experiment on a new prototype, rather than occupying valuable time on the larger, more expensive equipment purchased for the purposes of quality control, staff may simulate an environment anywhere from -75 oC to +180 oC at any relative humidity in just minutes without even leaving the lab.  Thus, even very small products can be tested under extreme conditions immediately.  Weiss benchtop units are available in 34, 64, 100, 120, and 240-litre sizes in a variety of models.

ESS test cabinets, stress screening chambers, HALT/HASS

Manufacturing companies use environmental stress screening, during which products are subjected to extreme heat fluctuations, to explore where an electronic device’s weak points are quickly.  In high-power stress screening chambers, high cooling and heating rates (15 K/min on the high end) make it possible to produce temperature changes at very high speeds.

Temperature and climate tests may also be combined with vibration resistance tests, where the system enables the simultaneous simulation of mechanical vibration and thermal/climatic loads.  In such chambers (see illustration), products are subjected in a short time to as much environmental load as they might experience over years of operation in their intended operating environments.  Thus, the manufacturer obtains fast information on the probable risk of failure in relation to a given product.  Even more radical heat fluctuations are simulated in a thermal shock chamber, where test objects are moved back and forth between a cold interior space (as cold as -80 oC) and a warm one (up to +220 oC).  More recent advances include equipment that enables what are known as HALT or Highly Accelerated Life Time) and HASS (Highly Accelerated Stress Screening) tests, where temperature fluctuation of up to 80 K/min and omni-axial vibration are achieved at the same time.

IN-LINE test tunnels

Weiss manufactures its IN-LINE test tunnels for 100% production-integrated product testing applications.   In such a tunnel, products pass through test zones of various temperatures, with functional testing in each cold or warm zone occurring automatically.  The system is capable of marking faulty products and automatically removing them from the production line, ensuring that customers never receive a product that does not meet specifications.

WEISS-Umwelttechnik GmbH

Weiss-Umwelttechnik GmbH Is one of the most important producers of
standard testing chambers and systems for environmental simulation
worldwide. The product range comprises temperature and climate testing
systems as well as test systems for simulated exposure to weather,
temperature shock, corrosion and for long-time testing in various test
chamber volumes. Walk-in /drive-in chambers and process-integrated
plants for environmental simulation and biology are designed, produced
and installed in accordance with customer specifications. Weiss
Umwelttechnik is certified according to DIN EN ISO 9001.

50th Anniversary Weiss

The year of foundation is 1956. That time, during the period of
reconstruction of German industries Karl Weiss founded
the Karl Weiss: company in Giessen, Germany.
The job was the production of physical measuring equipment.
Soon, environmental simulation and air conditioning were added as
new business fields. The company grew very fast and moved from
Giessen to Lindenstruth in 1963/64.

Since that time the company has permanently been increased due to
new production fields. 1978 Weiss Technik became member of the
Schunk Group.
In 1986 Weiss Technik was separated in the business fields
environmental simulation and air conditioning technology which was an
important event in the company`s history. Weiss Klimatechnik GmbH
and Weiss Umwelttechnik GmbH were founded.
In 1995 Vötsch Industrietechnik in Balingen was acquired from Heraeus
in Hanau. Since that time Weiss expanded internationally.
In 2006 the Weiss Group comprises 8 subsidiaries and approx.
35 agencies world-wide.

A Weiss honlapja: www.wut.com