Keeping you up to date...

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.
April 30, 2024
Welsh engineering company transfers to Employee Ownership
By 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.
September 7, 2022
The evolving test requirements for Electric Vehicle battery packs means test specifications are constantly being pushed to new boundaries. JTS has risen to these challenges with our range of containerised test chambers. With extensive experience in the design and build of reliable high-performance bespoke environmental test chambers we provide solutions to large multi-national companies, both here in the UK and overseas.
July 13, 2022
One of the exciting things about the work we do at JTS is the fact that no two projects are the same. Customer needs can be varied and sometimes the solution seems impossible, but most are issues that can be resolved, especially if JTS are invited into discussions at the early stages of a project.  We have worked through an extensive list of site complication over the course of supplying chambers all over the UK – few are new to us.
April 14, 2022
JTS have recently worked with a great customer who needed help to resolve a dilemma. They were in the process of relocating to a fantastic new facility but their current chamber was just not up to being moved again and the existing cooling plant was extremely dated and inefficient. The project had lost valuable time in the pre-planning stage and delivery was getting critical, so the customer needed to find someone that would be able to design, build and install the chamber in a tight time frame.
May 6, 2021
TEST CHAMBER SPECIALISTS Engineered Solutions, designed and built in Britain James Technical Services is an established independent, specialist manufacturer – designing and building high-performance environmental test chambers for a wide variety of industries. Our mission is to work closely with our customers to provide innovative solutions for their product development and quality assurance. As such, we are delighted to have been working on a project with Grayson Thermal Systems who is the market-leading supplier of cooling, HVAC and e-mobility systems across a variety of industries. The design brief was to build a large environmental test chamber to provide controlled temperature conditions between -30°C and +55°C with some test loads dissipating up to 30kw. The combination of a ceiling-mounted cooling unit, fitted with three EC fans and a speed-controlled Ecostar Bitzer condensing unit ensure maximum efficiency in full and part load operations. Double doors and a removable aluminium ramp give easy access to a test area that is 2.8m wide x 3.8m deep and 2m high. The high load-bearing anti-slip floor is fitted with drainage points to facilitate the safe containment of test fluids used within the customer processes. One wall of the room is fitted with an inlet and an outlet port allowing the customer to connect their test product up to an external conditioned temperature and humidity cyclone air supply. This cyclone air is mixed and conditioned in an insulated enclosure adjacent to the main test area where humidity is introduced via a steam lance. To give full testing flexibility two insulated stainless steel bungs are provided to isolate the cyclone system when it is not required. As with any bespoke design, it is key that the customer interface is accurate, informative and easy to navigate, so for this JTS use the Watlow F4T touch screen programmable controller which permits custom screens to be created. Taking full advantage of ethernet connectivity the chamber can be run and monitored from a PC anywhere on the network. With the chamber installed and commissioned, Grayson Thermal Systems can look forward to a future of reliable testing backed by our after-sales support for scheduled maintenance and calibration, with a quick efficient response should a breakdown occur. The full magazine is available to view at https://joom.ag/Ku6I
Inside a test chamber
April 15, 2021
The chambers operate by controlling the parameters of temperature and humidity, with a good airflow being an important part in achieving even distribution and uniformity. Temperature Control To achieve a set level of temperature the chamber must be able to both heat and cool to achieve and control at the desired level. Heating – this is done using electrical heating elements sized accordingly to the chamber specification and positioned in the airflow to give even distribution and uniformity. Cooling – this is done using a mechanical cooling system with close loop control. The main parts of a single stage cooling system are compressor, condenser, expansion valve, solenoid valves and cooling coil (Evaporator). Evaporators are sized to achieve a specific cooling duty and are generally located in a conditioning plenum to give even distribution into the test area. A single stage system will achieve temperatures down to -40°C. A cascade system is a two stage cooling system and has the addition of a second compressor. The system uses two refrigerants, one type for the first stage and another for the second stage. A cascade system will achieve temperatures down to -65°C. Humidity Control To achieve a set level of humidity the chamber must be able to both humidify and dehumidify in order to achieve and control at the desired level. Humidity – this is done by introducing steam into the test area, the steam is generated outside the test area and is pulsed into the conditioning plenum in a controlled manner. Dehumidity – this is done by creating a controlled cold surface using the main refrigeration cooling system, moisture from the turbulent airflow is then condensed on to this cold surface. All test chamber utilise these basic components and it is the expertise at JTS that pulls together the right combinations to ensure that the chambers we supply meet the customer specification. Please get in contact to discuss your test chamber requirements, if one of our standard machines doesn’t meet the test specification we will be able to size a bespoke build that definitely will.
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Keeping you up to date...

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.
April 30, 2024
Welsh engineering company transfers to Employee Ownership
By 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.
September 7, 2022
The evolving test requirements for Electric Vehicle battery packs means test specifications are constantly being pushed to new boundaries. JTS has risen to these challenges with our range of containerised test chambers. With extensive experience in the design and build of reliable high-performance bespoke environmental test chambers we provide solutions to large multi-national companies, both here in the UK and overseas.
July 13, 2022
One of the exciting things about the work we do at JTS is the fact that no two projects are the same. Customer needs can be varied and sometimes the solution seems impossible, but most are issues that can be resolved, especially if JTS are invited into discussions at the early stages of a project.  We have worked through an extensive list of site complication over the course of supplying chambers all over the UK – few are new to us.
April 14, 2022
JTS have recently worked with a great customer who needed help to resolve a dilemma. They were in the process of relocating to a fantastic new facility but their current chamber was just not up to being moved again and the existing cooling plant was extremely dated and inefficient. The project had lost valuable time in the pre-planning stage and delivery was getting critical, so the customer needed to find someone that would be able to design, build and install the chamber in a tight time frame.
May 6, 2021
TEST CHAMBER SPECIALISTS Engineered Solutions, designed and built in Britain James Technical Services is an established independent, specialist manufacturer – designing and building high-performance environmental test chambers for a wide variety of industries. Our mission is to work closely with our customers to provide innovative solutions for their product development and quality assurance. As such, we are delighted to have been working on a project with Grayson Thermal Systems who is the market-leading supplier of cooling, HVAC and e-mobility systems across a variety of industries. The design brief was to build a large environmental test chamber to provide controlled temperature conditions between -30°C and +55°C with some test loads dissipating up to 30kw. The combination of a ceiling-mounted cooling unit, fitted with three EC fans and a speed-controlled Ecostar Bitzer condensing unit ensure maximum efficiency in full and part load operations. Double doors and a removable aluminium ramp give easy access to a test area that is 2.8m wide x 3.8m deep and 2m high. The high load-bearing anti-slip floor is fitted with drainage points to facilitate the safe containment of test fluids used within the customer processes. One wall of the room is fitted with an inlet and an outlet port allowing the customer to connect their test product up to an external conditioned temperature and humidity cyclone air supply. This cyclone air is mixed and conditioned in an insulated enclosure adjacent to the main test area where humidity is introduced via a steam lance. To give full testing flexibility two insulated stainless steel bungs are provided to isolate the cyclone system when it is not required. As with any bespoke design, it is key that the customer interface is accurate, informative and easy to navigate, so for this JTS use the Watlow F4T touch screen programmable controller which permits custom screens to be created. Taking full advantage of ethernet connectivity the chamber can be run and monitored from a PC anywhere on the network. With the chamber installed and commissioned, Grayson Thermal Systems can look forward to a future of reliable testing backed by our after-sales support for scheduled maintenance and calibration, with a quick efficient response should a breakdown occur. The full magazine is available to view at https://joom.ag/Ku6I
Inside a test chamber
April 15, 2021
The chambers operate by controlling the parameters of temperature and humidity, with a good airflow being an important part in achieving even distribution and uniformity. Temperature Control To achieve a set level of temperature the chamber must be able to both heat and cool to achieve and control at the desired level. Heating – this is done using electrical heating elements sized accordingly to the chamber specification and positioned in the airflow to give even distribution and uniformity. Cooling – this is done using a mechanical cooling system with close loop control. The main parts of a single stage cooling system are compressor, condenser, expansion valve, solenoid valves and cooling coil (Evaporator). Evaporators are sized to achieve a specific cooling duty and are generally located in a conditioning plenum to give even distribution into the test area. A single stage system will achieve temperatures down to -40°C. A cascade system is a two stage cooling system and has the addition of a second compressor. The system uses two refrigerants, one type for the first stage and another for the second stage. A cascade system will achieve temperatures down to -65°C. Humidity Control To achieve a set level of humidity the chamber must be able to both humidify and dehumidify in order to achieve and control at the desired level. Humidity – this is done by introducing steam into the test area, the steam is generated outside the test area and is pulsed into the conditioning plenum in a controlled manner. Dehumidity – this is done by creating a controlled cold surface using the main refrigeration cooling system, moisture from the turbulent airflow is then condensed on to this cold surface. All test chamber utilise these basic components and it is the expertise at JTS that pulls together the right combinations to ensure that the chambers we supply meet the customer specification. Please get in contact to discuss your test chamber requirements, if one of our standard machines doesn’t meet the test specification we will be able to size a bespoke build that definitely will.
Show More
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