API-DEW Integrated Weld Purge Monitor with Dew Point Sensor

Model API-DEW is Justram’s integrated weld purge monitor with dew-point sensing for critical welding applications. It brings oxygen and moisture monitoring together so welding and quality teams can assess the purge atmosphere, not only residual oxygen.

Integrated oxygen and moisture monitoring

API-DEW monitors gaseous oxygen and water content during weld purging. Its high-contrast OLED screen can display oxygen, water content and Total O2 (also called Equivalent O2), helping users consider water vapour alongside oxygen when setting and monitoring purge conditions.

Key features

• Oxygen monitoring down to 10 ppm
• Integrated dew-point measurement for water-content monitoring
• Total O2 / Equivalent O2 display combining oxygen and moisture information
• Internal sampling pump and internal data logging
• PurgeNet™ interface for charging and compatible smart accessories
• Audible alarm and configurable screen menus
• Portable enclosure rated IP65 with the lid open and IP68 with the lid closed

Sampling and setup

The monitor uses 6 mm quick-fit, leak-tight hose connections. For accurate results, the manual specifies an approximate sample-gas flow of 4 L/min. Allow the sensor to warm up before use and a further five minutes for full stabilisation when best accuracy is required.

Understanding Total O2

Water vapour can contribute to oxidation in the welding arc. API-DEW expresses moisture as water content and can display Total O2, which combines the measured oxygen value with the contribution from water vapour. Use the acceptance limits defined by the applicable welding procedure.

Specify API-DEW for your application

Contact Justram with your welding process, purge gas, sample arrangement and required oxygen or moisture acceptance limits. We can help confirm the required configuration, accessories and data-recording requirements.