Maximising test load capacity

Gillian • February 1, 2023

An issue faced by many customers is how to achieve the most test capacity without impacting on chamber performance. Putting the maximum test load in and still achieving even distribution and stability is a challenge when building bespoke equipment.

Airflow is key and having a good understanding of how a customer will load their product ensures the best results are achieved. 



For one JTS customer who’s test cycle lasts several months, incorporating steady slow ramps and long dwells, humidity distribution is critical. For them the distribution accuracy is so paramount the chamber is regularly calibrated using the 9 point mapping system. One probe is placed in each corner just away for the chamber wall and one in the centre, the allowable tolerance in this scenario is 2% rh. During tests if the humidity fluctuates out of specification in any area of the chamber, the test is aborted. 


Bespoke racking can help resolve distribution issues and the rack on this recent project was built to ensure good even air flow and ensure stability.

With a temperature range of -20°C to +80°C and a humidity range of 20 to 98% the chamber spends a lot of time testing at high temperature and high humidity, over 95%. These conditions are harsh, so the test frame was built of stainless steel and to enable easy product loading, sliding compartments were incorporated in the design.

Fully loaded this racking weighs around 600kg, so a reinforced chamber floor was essential.



Reliability of chambers that do long term testing is essential, down time causes testing backlogs and unwanted stress. Time spent understanding what is required of a chamber and how it is going to be used, ensures JTS get the design and build correct.


This in turn enables us to keep to our mission, to design and build robust, innovative solutions for our customers - something to rely on.

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At JTS, Health and Safety is a responsibility shared by everyone across our employee owned business here in Wales. As manufacturers of environmental test chambers, we regularly handle large and heavy equipment, making safe manual handling practices and properly trained forklift personnel an essential part of our day to day operations. National Forklift Safety Day is an important reminder of the role trained operators play in keeping our workplace safe, efficient, and compliant - helping reduce risk, prevent injury, and ensure materials are moved safely and correctly. A huge thank you to our forklift drivers and wider team for continuing to put safety first every day. Because good safety culture protects people, products and productivity. We’re also pleased to share that two of our workshop engineers are currently completing forklift operator training this week, further expanding our team of qualified forklift drivers 👍
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