Series 3500/3510

Unmatched Technology & Value

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

Our ALPHA OMEGA INSTRUMENTS™ Series 3500™ Percent Oxygen Transmitter with a single range of 0-500, 0-1,000, or 0-10,000 ppm with looped powered at 14-32 VDC is available for purchase on our online store.

Series 3500 includes

  • Accurate and dependable trace oxygen measurements in a variety of background gases
  • Long-life Ambient Temperature Electrochemical Sensor
  • NEMA 4 enclosure
  • 4-10 mADC output
  • Factory calibration, NIST calibration certificates available upon request

Standard Lead Time: Due to increased demand, current lead time is approx. 5 weeks.


  • Long Life Trace Oxygen Sensor: Provides up to three times the functional life of most “fuel cell” type sensors. Reliability is dramatically increased while maintenance costs are reduced.
  •  Sealed Sensor: Eliminates handling potassium hydroxide (caustic), a hazardous material or having to frequently “recharge” the electrolyte.
  •  CO2 Resistant Sensor: Optional CO2 resistant sensor is designed to operate with sample gases containing up to 100% CO2. Conventional “fuel cell” type sensors using potassium hydroxide (KOH) electrolyte can be poisoned from CO2.
  •  Affordable: Affords savings of up to 30% and more over other manufacturers trace oxygen transmitters.
  •  Wide Measurement Range: Measure from under 1 PPM to as high as 20,000 PPM oxygen.
  •  Factory Calibration: 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.
  •  NEMA 4 Enclosure: Greater installation flexibility with a dust and waterproof enclosure.


  • Measurement Ranges: (parts per million) 0-10, 0-50, 0-100, 0-500, 0-1,000, 0-5,000, 0-10,000, and 0-20,000
  • Accuracy¹: ±1% of full scale (± 5% of full scale on ranges ≤ 0-5 ppm)
  • Linearity: ±1% of full scale.
  • Response Time: 90% of full-scale response in less than 10 seconds (typical). The response time for ranges of 0-50 PPM or less depend to a great extent on the design of the sample delivery system including the materials used.
  • Sensor Type: Long-life Ambient Temperature Electrochemical Sensor (Optional CO2 Resistant Sensor Available).
  • Temperature Compensation: Standard.
  • Operating Temperature Range: 40° to 104°F (5° to 40°C) <40° F (<5°C) use heated sensor enclosure >104° F (>40°C) cooling of sample gas/sensor required
  • Warranty: Two years electronics one year sensor.


    A nemesis for many conventional “fuel cell” type trace oxygen sensors are their inability to measure oxygen in gases. Carbon dioxide reacts with potassium hydroxide electrolyte to form carbonic acid and in short time destroys the sensor. Not anymore. We offer an optional CO2 tolerant trace oxygen sensor with proprietary electrolyte. The CO2 tolerant sensor is capable of providing accurate oxygen readings in gases containing up to 100% CO2 without shortening the life of the sensor.

    The Series 3500 Trace Oxygen Transmitter is a true loop powered (14-32 VDC) trace oxygen transmitter designed to provide accurate and dependable trace oxygen measurements in a variety of background gases. Measurement ranges available are from 0-10 PPM to 0-20,000 PPM. The Series 3500 enclosure is made from durable polycarbonate and is rated for NEMA 4 (IP 66) service (may change with the addition of certain optional equipment). A 4-20 mADC output is provided that can be used with a data logger, recorder, PLC, DCS, etc. Options include pressure regulators, flow meters, sample filters, and explosion proof (NEMA 7) housings. 

    The Series 3510 Trace Oxygen Transmitter is the AC powered (115 or 230 VAC, 50-60 Hz) or 24 VDC counterpart to the Series 3500 and is recommended when AC power is available or preferred. In addition to the optional equipment mentioned above, the Series 3510 can be equipped with sample pumps, and solenoid valves.


    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.

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    Trace Oxygen Transmitter with Long-Life Sensor & Wide Measurement Range

    Process Insights_AOI Series-3510 blind transmitter


    • 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

    Other Oxygen Monitors for Industrial Applications

    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™ 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

    Series 2520™

    ALPHA OMEGA INSTRUMENTS™ Portable Percent Oxygen Analyzer 0-5, 0-10, 0-25, 0-50, and 0-100%
    rocess Insights_AOI_Series 2520 portable oxygen analyzer
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    Questions? We’re here to help.