Series 2520

Unmatched Portable Reliability, Technology & Value

Precision market leading trace and percent oxygen analyzers and transmitters can protect your process, plant and personnel

Our ALPHA OMEGA INSTRUMENTS™ Series 2520™ Portable Analyzer is a battery-operated percent oxygen analyzer designed for industrial and commercial applications where accurate and reliable spot percent oxygen measurements are needed.  The Series 2520 Portable Percent Oxygen Analyzer is a lightweight, easy-to-use analyzer that provides accurate and repeatable percent oxygen measurements in a variety of gases. The rugged and compact design of the Series 2520 makes it ideal for industrial applications where spot oxygen measurements need to be made.

The Series 2520 can be configured with one of several measuring ranges from 0-1% to 0-100% oxygen. The standard Series 2520 Portable Percent Oxygen Analyzer is equipped with a 3-1/2-digit liquid crystal display, built-in NICAD batteries, and a universal AC adapter that provides the ability to recharge the NICAD batteries even while powering the analyzer from the adapter.  It features an extended life oxygen sensor with EES (Enhanced Electrolyte System) that provides exceptional measurement accuracy and stability.  

For applications where carbon dioxide is present in the sample gas, the EES retards passivation of the sensor anode by allowing the products of oxidation to dissolve in the electrolyte. In effect, the sensor is renewed continuously, resulting in an increase in sensor life. The output from the sensor is temperature compensated.


  • A factory Certificate of Performance Verification and Calibration is included at no additional charge. The product performance is verified in accordance with manufacturing specifications using a National Institute of Standards and Technology (NIST) traceable transfer calibrated standard gas mix.
  • State-of-the-Art Sensor Technology:  High Precision Measurements
  • Light Weight/Compact Design:  Easy to Carry and Transport
  • Rapid Speed of Response:  Senses Oxygen Changes in Seconds
  • Built-in NICAD Batteries:  Provides Hours of Continuous Operation
  • Uses Standard NICAD’s:  Replacement Batteries Found World-Wide
  • Minimum Maintenance:  Low Cost of Ownership


  • Measurement Ranges: 0-5, 0-10, 0-25, 0-50, and 0-100%
  • Accuracy: ±1% of full scale (± 5% of full scale on ranges ≤ 0-5%)
  • Linearity: ±1% of full scale
  • Response Time: 90% of full scale in <20 seconds
  • Sensor Type: Electrochemical
  • Temperature Compensation: Standard
  • Operating Temperature Range: 40° to 104°F (5° to 40°C)
  • Warranty: Two years electronics/1 year sensor


  • Enclosure: Polycarbonate-rated NEMA 1
  • Dimensions: 5.8 in. (147.3 mm) Height 6.7 in. (170.2 mm) Width 3.4 in. (86.4 mm) Depth – Note: All dimensions are without optional equipment
  • Gas Connections: Quick connect
  • Weight: <2 pounds (<0.907 kg)


Need help?  Complete our Oxygen-Application-Questionnaire.


Need service on your oxygen analyzer?  No problem.   We are ready to assist you with any technical or service-related inquiries.  Just complete our Oxygen Monitor RMA.

To Top

A Battery-Operated Percent Oxygen Analyzer with Low Cost of Ownership and Maintenance

rocess Insights_AOI_Series 2520 portable oxygen analyzer


  • Aerospace/Govt.
  • Bioreactors
  • Bio-Research
  • Bulk Industrial Gases
  • Chamber/Glove Box Manufacturers
  • Chemical
  • Chemical Storage
  • Combustion Control
  • Electrical Transformers
  • Fertilizers
  • Fiber Optic Research
  • Landfill

  • Light Bulb Manufacturers
  • Medical
  • Metal/Heat Treating
  • Nuclear & Nuclear Recovery
  • Petrochemical
  • Pharmaceutical
  • Plastics
  • Power Generation
  • PSA & VPSA Processes
  • Research Labs
  • Semiconductor & Ceramics
  • Specialty Gases
  • Synthetics
  • Veterinary Medicine


Americas +1 713.947.9591
EMEA +49 69 20436910
China/APAC +86 400 086 0106

Our Oxygen Monitors 

Series 1000™

Series 1300 replaces the Series 1000
Series 1300 replaces the Series 1000

Series 1300™

ALPHA OMEGA INSTRUMENTS™ Oxygen Deficiency Monitor
Process Insights_Series 1300 Oxygen Monitor

Series 3000™

ALPHA OMEGA INSTRUMENTS™ Trace Oxygen Analyzer 0-1 PPM to 0-10,000 PPM
Process Insights_Series 3000 Oxygen Monitor

Series 3500/3510™

ALPHA OMEGA INSTRUMENTS™ Trace Oxygen Blind Transmitter 0-10 PPM to 0-20,000 PPM
Process Insights_Series 3500 Oxygen Monitor

Series 3500/3510™ EX

ALPHA OMEGA INSTRUMENTS™ Trace Oxygen Blind Transmitter Explosion Proof 0-10 PPM to 0-20,000 PPM
Process Insights_AOI_35003510 Explosion Proof Transmitter

Series 3520™

ALPHA OMEGA INSTRUMENTS™ Portable Battery-Operated Trace Oxygen Analyzer
Process Insights_Series 3520_oxygen monitor

ZRO 2000™

ALPHA OMEGA INSTRUMENTS™ Trace Zirconia Oxygen Analyzer PPM to 100%
Process Insights_AOI ZRO 2000 oxygen analyzer


ALPHA OMEGA INSTRUMENTS™ Percent Oxygen Analyzer 0-100% and 0-25%
Process Insights_AOI-OXY-SEN oxygen analyzer

Series 2000™

ALPHA OMEGA INSTRUMENTS™ Percent Oxygen Analyzer 0-1 to 0-100%
Process Insights_AOI_Series 2000 oxygen analyzer

Series 2500/2510™

ALPHA OMEGA INSTRUMENTS™ Percent Oxygen Transmitter 0-2% to 0-100%
Process Insights_AOI_ Series 2510-Percent-Oxygen-Transmitter
To Top

Questions? We’re here to help.