Purge Monitors

Purge Monitors to detect  residual Oxygen.

These Purge Gas Monitors or oxygen monitors are accurate & easy to use.

Please refer to the chart below to see the full family of Purge Gas monitors available. Then select the item of interest for more information, from above.

Weld Purge monitors are available in stock.

Monitoring the oxygen content
Weld discolouration caused by the presence of oxygen in the purge gas may well be acceptable under some circumstances, but the mechanical and metallurgical properties of the joint can be compromised and this can lead to weld failures in service.

Rather than risk weld contamination, measurement and control of purge gas oxygen content during the welding cycle is the recommended approach.

The State of Current Technology
For routine welding of the majority of stainless steels there is a requirement for the purge gas to contain less than 0.01% oxygen. More sensitive materials such as titanium alloys and some special stainless steels, particularly when used by the semiconductor industry, may require oxygen levels well below 0.01%

Purge Gas Monitor Options

A basic monitor from Huntingdon Fusion Techniques has been developed to meet the role of providing a rapid and accurate reading of oxygen in the purge gas in a compact and robust instrument rugged enough to be suitable for on-site application. It can be used as a continuously reading instrument with free flow of the purge exhaust gas across the sensor or as a sampling instrument with the hand vacuum pump extracting samples from the purged volume, as and when desired.

For more demanding measurement specialised models have been introduced. These have a measuring range that goes down below 10 parts per million.

A second generation of monitors has been designed to meet the requirements for welding of high specification stainless steels, duplex steels, titanium and other reactive alloys. They have a measurement range from 1000 to 10 ppm.

Justram purge monitors now incorporate a networking facility to integrate with a range of accessories to control welding processes from the monitor controller. For example, automatic machines such as orbital welders can be switched on and off automatically by the monitor to meet operator pre-set oxygen levels.