Page 34 - ITA Journal 3-2018

Technical Papers
Residual oxygen measurement instruments
Any effective weld purge process needs to be supported by suitable oxygen detecting equipment. Weld Purge Monitors® have now been developed to meet the need for reliable, robust and sensitive measure- ments. For reactive and refractory alloy welding these must be capable of measuring oxygen levels down to 10 ppm.
As an example, the PurgEye® 300 Plus instrument manufactured by Huntingdon Fusion Techniques HFT® reads down to 10 ppm with extreme accuracy and has a display range from 1,000 to 10 ppm.
Mains driven, the instrument has integral switching software to control external devices like power supplies or alarms and software to give QC analysis when connected to a PC.
Fig. 9: An alternative version to this model is the PurgEye®500 Desk, see below, which has an integral pump to extract samples on a timed basis when no regular free ow of gas is available.
The entire Argweld® product range is supported by an extensive tech- nical library of publications including Technical Notes, White Papers, Conference Proceedings and peer-reviewed International Articles. These are available on-line by application to Huntingdon Fusion Tech- niques HFT®.
References
1. ASME International, Three Park Avenue, NY 10016, USA
2. TWI Job Knowledge Pt II , The Welding Institute, Cambridge CB21 6AL, UK
3. J Watson, Welding Industry News, September 2013
4. American Welding Society, 8669 NW 36 Street, Miami, FL 33166- 6672
5. ATI Wah Chang, P.O. Box 460, Albany, OR 97321
6. D Haas, The Fabricator, April 2004
7. Arc-Zone, Las Palmas Drive, Carlsbad CA 92011-1551
ITAtube Journal No3/October 2018
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