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In 1975, Huntingdon Fusion Techniques® (HFT™) was approached by British Nuclear Fuels Limited (BNFL) to provide them with an oxygen monitor that was more suitable for the welding industry.
Until that time, oxygen monitors were large, expensive and unwieldy instruments, especially those that would give a reading that would be adequate for joining the new ranges of stainless steels then being developed.
It was necessary to have a reading that would be reliable and reproducible instead of a flickering needle on an analogue scale. 
Using the then modern digital technology, HFT™ developed the first of a new breed of instruments
which led to the birth of the Weld Purge Monitor®.
Early in 2013 after nearly 40 years of updating designs and continuous manufacturing of the Weld Purge Monitor®, the European Economic Community awarded HFT™ with the Registration Document, giving the company ownership of the term and name of Weld Purge Monitor®
The only innovators, designers and developers of a complete range of Weld Purging Products, Huntingdon Fusion Techniques® has developed 7 different models of the original MKI, resulting in today’s advanced version known as the PurgEye® 100 IP65.
In the meantime, the Company has gone on to produce a whole range of
Weld Purge Monitors to suit every application and budget.