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Oxygen + CO2 Weld Purge Monitor

oxygen co2 weld purge monitor
Regular price $4,499.00 USD

POs or wholesale quantity discounts click here

The TecPen Oxygen and CO2 Weld Purge Monitor is designed to provide accurate measurements down to 0% oxygen and up to 100% carbon dioxide when back purging with an argon and CO2 gas mix during welding. It is most commonly used for verifying C25 or C100 shielding gas during MIG welding.


  • Test oxygen levels in shield gas down to 2 ppm
  • Test CO2 levels up to 100%
  • Oxygen measurements in less than 3 seconds
  • CO2 measurements in less than 10 seconds
  • Large display easily read during welding
  • Effective and long-life optochemical sensing
  • Data logging with USB transfer

Industry Applications

  • MIG Welding Gas
  • C25 Shielding Gas
  • C100 Shielding Gas
  • Praxair Autoweld Shielding Gas
  • M21 Euromix


  • TS-302 TecPen Oxygen and CO2 Weld Purge Monitor measures trace oxygen and CO2 gas levels simultaneously
  • TS-300 - TecPen Weld Purge Monitor measures trace oxygen only click here.


  • Measurement range: 0-2,000ppm
  • Accuracy @ 0-500 ppm: 2% MEV**
  • Accuracy @ 500-1000 ppm: 3% MV*
  • Accuracy @ 1,000-2,000ppm: 4% MV*
  • Resolution: 1ppm
  • Response time at 25°C: < 15 seconds
  • Pump flow: 400mL/min.
  • Temp. range Min./Max: 14°F-140F° (-10°C-60°C)
  • Medium: Gas
  • Power supply: 5V USB and LiPo Battery
  • Rechargeable battery life: > 3 hours per charge
  • Data Interface: USB
  • Temperature compensation: 50 - 86°F (10 - 30°C)
  • Display: OLED
  • Cleaning: no organic solvents, 40% EtOH
  • Parts touching sample: St.1.4404 / PTFE / glass
  • Case: Anodized aluminum
  • Protection: IP65
  • Manufacturer service Interval: 3 years
  • Lifetime of sensor cap: 2 years @ normal welding conditions and atmosphere, 60°C with proper filtering
  • Sensor cap replacement interval: 2 years
  • Recommended customer calibration interval: 6 months

**MEV=Measured End Value
*MV=Measured Value

TecSense sensors are CE, FCC, IC, KC and MIC marked, and meet the requirements of ASTM F2714-08. The manufacturer is DIN ISO 9001/2015 certified.


  • 1 year. See GasLab Terms and Conditions. 

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"Swift response and shipment. The product is easy to setup and use. It is just what I was looking for."

- Shima Tomohiro

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