“These metals are commonly welded with the GTAW (TIG) process that needs the arc and its surrounding zone to be shielded with a high specification inert gas that has the minimum amount of oxygen,” said Ron Sewell, Chairman, HFT. “If the welds and their adjacent metal become oxidised, that may lead to a reduction of resistance to corrosion and potential joint integrity. These risks have to be prevented.”
PurgEye Nano was developed for weld purging where data logging, alarms and machine control are not necessarily required. It is small, lightweight, inexpensive and developed with a long life sensor that has a warm up time of under 60 seconds.
“For this purpose, HFT invented the Weld Purge Monitors in the 1970’s to measure the oxygen levels for welding. At that time, 100 parts per million of oxygen in argon was deemed to be a good level for most stainless steel and other metals to be welded, however research shows that it has become necessary to try to attain a purity approaching 10 ppm of oxygen in argon when shielding the welds zones”
With leak-tight connectors for weld purge hoses, PurgEye Nano can be used with optional accessory hand pump and gas sampling probe. It can be used to check purge gas quality from the main source and at the exhaust end of a purging system, as well as to find air leaks in purging hose connections anywhere in a system.