Industrial Gas Analyzer

The XGA301 Industrial gas analyzer from Michell Instruments provides a convenient platform to measure oxygen, dew point and other gases such as CO2, CO and CH4. The analyzer can be supplied in one of two bench-mounted chassis and with up to three sensors fitted.

Standard features include two fully-programmable alarm circuits (voltage-free contacts), programmable analog outputs, RS232 communications and complete Windows-based data-logging software.

The industrial zirconia oxygen sensor provides fast and accurate oxygen analysis over the range of 1 ppm to 30%* O2 and delivers stable and repeatable readings, with a typical response time of less than 5 seconds for a 90% response to a step change in gas compositions. The zirconia sensor is heated, and temperature-controlled to enable oxygen ions to conduct. An internal pressure sensor compensates for small changes in the gas pressure to maintain accurate and stable readings. An optional, variable speed-pump draws a gas sample at a flow rate set by the user between 0 to 1.2 Nl/min.

The Easidew Sensor is available for dew points down to –100°C in combination with another sensor within the XGA301A2’s chassis.

*Analyzer is not suitable for enriched oxygen.

Product Features

  • Sensor choices from zirconia, galvanic electrochemical, infrared and ceramic impedance technologies
  • Variable speed pump (optional)
  • Zirconia sensor cleaning facility which can be operated at any time during use
  • Intuitive HMI with back-lit display
  • Two fully-programmable alarms
  • 2 x voltage outputs and 2 x 4–20 mA outputs
  • Digital RS232 output
  • Software package includes live graphing and Excel™ compatible data-logging
  • Password protection


Technical Specification

Sensor Type: Zirconia Sensor
Measurement range 1 ppm to 30%*
*Not suitable for enriched oxygen
Calibration (user) Requires 2 or 3 user-selectable gases
Accuracy ±1% of reading or 0.5 ppm, whichever is greater
Response time Approx. 5 seconds for a 90% step change (gas flow rate of 1 Nl/min-1)
Stability ±2% of reading per month
Life expectancy Greater than 17,500 hours
Sensor Type: Ceramic Impedance**
**XGA301A2 only, please see the Easidew Transmitter datasheet for more information
Measurement range –100 to +20°Cdp
Calibration (factory) Traceable 7-point calibration certificate
Accuracy ±2°Cdp
Output Dew-point or ppmv moisture content
Operating temperature +5 to +35°C
Warm-up time 3 to 4 minutes @ +20°C
Maximum inlet temperature +50°C
Sample flow rate 0 to 1.2 Nl/min, user-selectable with pump
Maximum inlet pressure 1 barg
Display XGA301A1/A2: 16 x 2 character (9mm) back-lit LCDM
XGA301A3: 20 x 4 character (9mm) back-lit LCD
Power Supply 90–260 V AC, 50/60 Hz
Outputs 2 x 4–20 mA, 2x alarm relays RS232
2 x 0–10 V (XGA301A1 only)
2 x 0–5 V (XGA301A2 only)
Sample connectionsStandard: 4mm ID / 6mm OD nipple — gas fittings on front panel
Optional: Rectus™ or Swagelok® 6mm fittings, rear panel fittings for XGA301A1 only
Dimensions XGA301A1: 250mm x 263mm x 150mm
XGA301A2/A3: 350mm x 263mm x 150mm
Weight XGA301A1: 3.5kg
XGA301A2/A3: 4 to 5.5kg

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