Oxygen Analyzer OXY-EVO
for measuring residual oxygen in purge gas for welding stainless steels
The Model OXY-EVO is an oxygen analyzer for monitoring the residual oxygen of purge and shield gases used in the welding of stainless steels
This unit has upgraded digital electronics and is an ideal replacement for the SGI2 and SGI3 instruments
oxygen analyzer

Features of the OXY-EVO

  • Fast and accurate monitoring of residual Oxygen concentrations in purge gas.
  • Fast warm up time
  • Quick response typically 1 second
  • Exact readout of O2 concentration with large digital display.
  • Works for both Formier (H2,N2) mixtures and Argon gases.
  • Long life zirconia sensor, won't saturate in air.
  • Robust industrial strength instrument with hard shell case (option )
  • Delivered ready to use with calibration certificate
  • 2 year warranty

Introduction to the OXY-EVO measurement system

Inert gas welding requires the exclusion of oxygen from the weld zone during the welding process. The shield gas ( typically argon ) needs to be free of oxygen from air leaks into the feed hose and the back side of the weld needs to be protected with a purge, or backing, gas to ensure a low or controlled oxygen concentration on the back face of the weld. On the front face of a weld the the inert gas stream (provided it is free of leaks ) efficiently excludes oxygen from the weld zone. On the back side of the weld special precautions must be taken to prevent oxidation. This involves the isolation of the back side of the weld with fixtures that provide for the purging of this area with an inert atmosphere. The OXY-EVO instrument works with these fixtures to continuously sample the purge gas and to monitor the oxygen concentration. Monitoring the weld gases with an OXY-EVO adds a quantifiable element of quality control to the inert gas welding process. It also provides an economic benefit by giving the welder the information he needs to accurately judge the purge gas flow rate and purge period.

Principle of Operation of the weld gas analyzer

The unit contains a small pump which draws a continuous sample from the purge gas in the welding zone. This sample is passed into a special zirconium detector that is very sensitive to the presence of oxygen. A zirconia sensor is an electrochemical oxygen concentration cell with a solid ceramic electrolyte. It has the property of producing a small emf (voltage) in the presence of oxygen. The relationship between the emf produced by the detector and the oxygen concentration is well understood and highly repeatable. This means that the detector can be calibrated directly in oxygen concentration units. Sensors of this type can be used to measure concentrations from a few ppm all the way up to 100% oxygen. They are very reliable, the calibration is stable over long periods (years) and a detector calibrated for use with low ppm concentration as in the welding application will not saturate or show any degradation when exposed to high oxygen concentrations (air for example).

Specification of OXY-EVO weld gas analyzer

Sensor Type Ceramic / Zirconium oxide detector
Measuring Range Argon 21% to 1 ppm Oxygen in Argon or Nitrogen
Stabilisation time 10 - 15 mins
Response time 2 seconds
Accuracy 2%
Display 3.5" Color touch panel  
Alarms  User adjustable alarm limits and threshold
Data Logging USB Interface 
Outputs  Analog, Digital, bluetooth (Or available with outputs disabled)    
Dimensions 140 x 210 x 225 mm
Weight 2.1kg

Ordering Information OXY-EVO

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Model No. Description Price US$
OXY-EVO Complete instrument includes: Controller with LED readout, built in sample pump, 10 ft. of connecting hose, gap probe and filter. Calibration certificate and manual. $4850.00
OXYCC Hard shell Pelican Case $199.00

Calibration and repair service available.
Click the caliper to request an RMA.

Topac Inc. 231 CJC Highway, Suite 103 Cohasset MA 02025 USA
Tel: 781 740 8778 Fax: 781 740 8779

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