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.


By Gillian March 27, 2025
Following on from our transition into Employee Ownership in 2024, we are keen to expand our service department and are now looking for an experienced engineer to join our talented team.  If you have experience in servicing environmental test chambers, are happy to travel across the UK and occasionally to Ireland, this could be the role for you. Key Tasks To carry out preventative and scheduled maintenance of refrigeration, electrical and humidity systems on environmental test equipment Carry out annual calibrations of equipment Diagnose problems and carry out repairs, upgrades and retrofits on all refrigeration, electrical, humidity and software systems Work at customer premises, and in our workshop at Talgarth, Powys, as and when required Be part of our team for project installations To contribute to building customer relations and growing our servicing capabilities Managing your own work in conjunction with our office staff Managing service parts and equipment, and ensuring paperwork is complete Key Skills Experience with environmental test chambers Conversant with commercial and industrial electrical systems Knowledge of electronic controls/controllers Fgas qualification- City & Guilds Level 2 Fgas & ODS reg: cat1 500/5730/3 or equivalent Good working knowledge of refrigeration systems and refrigerants, including cascade systems Good pipework skills including brazing/silver soldering Capable of working alone on-site Competent with Microsoft Office and PC systems Scope This is seen as a key role within the company, and you will be an active contributor to the growth and successful future of the business. It is expected that as the business continues to grow you will contribute to the vision for the company, be forward thinking and open to change. Person Specification You will be a self-motivated engineer, with high integrity, able to work alone or as part of a team. An ability to use your own initiative is essential, as are excellent inter-personal skills and respect for customers. You must be able to organise and manage your work and be confident working independently, as well as part of a team when required. Weekend work is rarely required. Full clean driving licence essential. Expected start date - As soon as possible Location – can be based remote from Talgarth Hours – 40 hours / week Salary – negotiable depending on experience but between £40 - £45k + company van Full job description can be found on Indeed.com https://uk.indeed.com/viewjob?jk=a5ee79933e4cb0a9&from=shareddesktop_copy CV's being submitted to JG HR Solutions Limited - julie@jghrsolutions.co.uk
October 15, 2024
JTS were asked by local councillor William Powell to help out refreshing a storage container used by Talgarth Town FC juniors and ladies. After some initial discussions and a quick cad mock up to agree the paint scheme the JTS team began to work on the project. This happened with the help of the Black Mountains College (Power) and Talgarth Building Supplies (Paint) and the JTS workforce. As you can see the container has had a new lease of life and we hope the guys using the container like the paint work! ‘Good news TTFC under 10’s celebrated a home victory with the team having a photo and the container used as a back drop!’ 
July 22, 2024
James Technical Services Limited having been involved in electric car, battery development and testing over the past 7 years have now installed two 11kW charging points at the factory in Talgarth mid Wales. These points can be used by customers and employees 😊 JTS have always been following the progress of the battery development and have purchased their first electric vehicle which will be used by the employees to carry out sales / site visits.  The container test chamber below is used by various car manufacturers for electric vehicle battery testing. This is just one example of a battery testing facility JTS can supply.
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