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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What does “Made in Britain” mean to us? It means engineering expertise, quality, innovation and pride in what we do. Based in Wales, JTS designs and manufactures environmental test chambers, providing engineered test solutions that are designed and built right here in Britain. 🏭 We’re proud to be an employee-owned company, meaning the people who design, engineer, build and support our products have a genuine stake in the business and its future. We’re also proud members of @MadeinBritain the registered trademark supporting and promoting British manufacturing excellence. For us, buying British isn’t simply about where a product is made. It’s about supporting the people, skills, businesses and communities behind it. It helps strengthen UK manufacturing, supports local employment, preserves valuable engineering expertise and encourages the continued development of British innovation.  So, this Buy British Day, we’re celebrating the people who make it happen — from the engineers and designers to the skilled hands on the shop floor. Designed in Wales. Engineered in Britain. Built for the world. 🌍 Here’s to British manufacturing — and to keeping great engineering skills, innovation and jobs right here in the UK. 🇬🇧
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At JTS, being an employee-owned company means looking after one another isn't just a value – it's part of who we are. June 21st was 💙MND Awareness Day🧡 and we shared the story of our colleague, Jordan, whose resilience, determination and positivity continue to inspire us every day. Many of our customers across the UK will know Jordan. For years, he was a familiar face on the road, visiting customer sites, carrying out service work and calibrations, responding to breakdowns and helping to find practical solutions whenever challenges arose. His professionalism, knowledge and willingness to help made him a valued member of both the JTS team and the wider community we serve. When Jordan was diagnosed with Motor Neurone Disease (MND), life changed significantly. Together, we adapted his role so he could continue contributing in a way that worked for him. Today, Jordan works remotely, providing technical support to our field service engineers and contributing to our health and safety processes through risk assessments. While his role has changed, his expertise and experience remain just as valuable as ever. Alongside work, Jordan attends Sandville Self Help Foundation where he takes part in therapies, including hydrotherapy and physiotherapy, that help make day-to-day life more manageable for him which he says he is really enjoying and it’s having a positive impact. Jordan's journey is a reminder that, with the right support, understanding and flexibility, people can continue to make a meaningful impact. It's about recognising the value people bring and ensuring they have the opportunity to keep doing what they do best. We are incredibly proud to have Jordan as part of the JTS team and grateful for everything he continues to do. We stand with Jordan and everyone affected by MND, together we can raise awareness, encourage understanding and support those living with this condition. 💙🧡
June 18, 2026
With EO Day on Friday 19th June, we're proud to be putting JTS on 'The UK is Owning It Map' . 📍 The I-COM team have created this interactive map, where each pin represents a business that has chosen a different way of doing things. Every pin is a statement: we're here, we're employee-owned, and we're proud of it. We're delighted to stand alongside so many other employee-owned businesses across the UK, celebrating the power of shared ownership and the people who make it possible. At JTS, we're proud to be part of a growing movement that's putting people at the heart of business success. #EODay #EmployeeOwnership #TheUKIsOwningIt #ProudlyEmployeeOwned #JTS
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