Argweld® Mark V Weld Purge Monitor®

  • Product Overview
  • Sensors, Spares and Accessories
  • History of the Weld Purge Monitor®
  • Videos

Update to the PurgEye® 100 IP65 Weld Purge Monitor® 

PurgEye 100 IP65 Weld Purge Monitor® Oxygen Analysing Instrument Mark V comparison update

Most welders today have already switched to our PurgEye® 100 Weld Purge Monitor®. 

PurgEye® 100 has become the standard instrument for industry today. 

There are very few Argweld® Mark V Weld Purge Monitor®'s still in use because of the updated features on the PurgEye® 100.  See the NEW characteristics of the updated model:

Argweld® PurgEye® 100 IP65:

• Low Cost
• IP65 Rated
• Push button 'Auto Calibration' feature
• Low Battery Indicator
• Low Sensor Indicator
• Large LCD Screen with Large Digits
• Increased Sensor Reading Range
• Wrist and Neck Carry Strap
• Tripod Mount (optional accessory)
• Protective Rubber Housing (optional accessory)
• Automatic Sleep Mode when not in use
• Leak-Tight Stainless Steel Probe and Gas Hose Assembly
• Quick connect/disconnect Fittings for gas purge tubing

This very affordable hand held instrument is a must for every construction site and pipework fabrication facility around the World.

Purge-Monitors-MarkV-replace-exchange-WHuntingdon Fusion Techniques HFT® was the first company to have invented and developed a Weld Purge Monitor® in the 1970’s establishing a trademark that has become synonymous with weld purging of pipes, tanks, vessels and more. Registered Trademarks in USA and Europe.

All Weld Purge Monitor® manufactured by Huntingdon Fusion Techniques HFT® are internationally recognised as premier day to day Weld Purge Monitor® and have become standard oxygen measuring instruments in the industry.

The Company has continued to innovate year by year bringing to the market place a complete family of weld purge monitoring instruments for other materials including duplex, nickel and cobalt steels, titanium and other reactive alloys.

All models in the Family Range of Argweld® PurgEye® Weld Purge Monitor® are available for immediate delivery.

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Sensors, Spares and Accessories

Argweld PurgEye 100 IP65 Weld Purge Monitor Oxygen Analyser Analyzers Gas Measuring

Argweld® MarkV Sensors are NO longer available.    

The Mark5 Weld Purge Monitor® has become so out of date, it is no long viable to manufacture these sensors.  

Replace your MarkV with the NEW and greatly improved PurgEye® 100 Weld Purge Monitor®.  There are so many new features and benefits on the new and latest model.  

Plus, all PurgEye® 100 IP65 Sensors are manufactured in a unique packaging that will increase the sensor life significantly and guarantee longer life from your Monitor.

Spare sensors are packed at source inside a small sealed compartment to prevent oxygen from entering and causing the sensor to start to decay.

This sensor packaging affords an extra degree of protection to the special contacts and the sealing membrane on top.

PurgEye® 100 IP65 Weld Purge Monitor® not only have a “low sensor” warning signal, which normal oxygen monitors do not have, but you know that when your replacement sensor arrives that it will last much longer than those for other oxygen monitors.

Once the tiny amount of oxygen inside the sealed volume has been consumed, a partial vacuum has been created just leaving the residual atmospheric nitrogen behind that protects the sensor and leaves it inert until the package is opened for use.

Spare sensors are sold as a single unit or as multiples subject to preference.

The packaging will protect the sensor from scuffs and damage during transit and will keep it clean during storage.

HFT® is constantly considering the needs of the customer. By using our scientific knowledge and background, we are continuously developing, engineering and saving the customer money.

Other sensors in the industry have a low lifetime. They start to deplete immediately after manufacture and there may be several lost months before the sensors are put into use.

Allowing shipping time to the sub contractor who will keep them in stock for some time, then to the reseller who will then send them to the welding distributor after which it will be shipped to the customer who in turn might wait some time before using or inserting the sensor.

The average life of most other sensors for other monitors may be only as little as 10-12 months.

Please contact us or your nearest Distributor for further information.  


APMS105 NO LONGER AVAILABLE - Fuel Cell (Sensor) - Replacement for Mark-V Purge Monitor 
APMS007 Hose (2 Metre Length)
APMS008 Aspirator Bulb
APMS009 Probe (Stainless Steel Sample)
APMS010 Battery (Alkaline PP3)
APMS011 Re-Calibration and Certification
APMS012 Argweld® Weld Purge Monitor® Case


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Where it all began....

10W PurgEye100 IP65 WeldPurgeMonitor

Invented in the 1980’s by Vacuum Physics and Company Founder, Ron A Sewell, the Mark I Weld Purge Monitor® instrument was soon adopted by the welding industry as an essential piece of instrumentation for measuring the amount of oxygen in the purge gas.

Measuring range: Atmosphere down to 100 ppm.

As technology moved forward, so did our development of this initial unit, into MarkII, MarkIII, MarkIV and MarkV within the Argweld Family range of Weld Purge Monitors®.

The next millennium brought a completely new design and a new name……

PurgEye® 100 Weld Purge Monitor® was launched and is now the standard insturment of today used my most welding all over the World.  

And in 2021 a new IP65 version was created.  

Along with unique new packaging for the replacement sensors.

The PurgEye® 100 has become the world’s best-selling Weld Purge Monitor®. Loved by welders who are welding stainless steel and want to achieve bright, shiny, oxide-free welds.


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