Trace Oxygen Analyzer Series 3000

Trace Oxygen Analyzer Series 3000

The Trace Oxygen Analyzer Series 3000 is a rugged, microprocessor-controlled oxygen analyzer designed for continuous or intermittent measurement of trace oxygen concentrations ranging from 0-1 PPM to 0-10,000 PPM. 

The Series 3000 is housed in a general-purpose enclosure and is powered from either a universal 100-240 VAC, 50-60Hz, or 18-32 VDC. Trace oxygen values are displayed on a 0.4 inch (10.2 mm) high, 4-1/2 digit liquid crystal display (LCD). The Series 3000 is equipped with three oxygen alarm relays and one status alarm relay. All four relays are Form C (SPDT) types rated at 10 amps at 115/230 VAC and 30 VDC. The relays are user configurable for fail-safe operation. In addition to the four alarm contacts, the analyzer has a built-in audible alarm and three red LEDs for visual indication of an oxygen alarm condition.

The audible alarm may be manually canceled at any time. The Series 3000 provides users with two standard analog outputs, 4-20 mADC and 0-2 VDC. For enhanced communications, the analyzer can be equipped with optional RS-232C or RS-485 serial communications.  Also available with an optional CO2 tolerant sensor.

Competitively priced.  


  • 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 KOH electrolyte can be poisoned from CO2.
  • Affordable:  Economically priced with savings of up to 50% over other manufacturers trace oxygen analyzers.
  • Wide Measurement Range:  Measure from under 1 PPM to as high as 10,000 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.
  • Visual and Audible Alarms Included along with two analog recorder outputs.


A nemesis for any conventional “fuel cell” type trace oxygen analyzer is its inability to measure oxygen in gases containing carbon dioxide. Carbon dioxide reacts with potassium hydroxide electrolyte to form carbonic acid and in short time destroys the sensor. Not anymore. Alpha Omega Instruments offers 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% carbon dioxide without shortening the life of the sensor.

Series 3000 Trace Oxygen Analyzer


  • Improved reliability
  • Lower cost of ownership 
  • Improved product quality
  • Efficiency
  • Meet compliance requirements
  • Backed by global service and support

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  • Ranges(parts per million): Single-range 0-10,000; 0- 5,000; 0-1,000; 0-100; 0- 50; Three-range 0-100/1,000/10,000; 0- 50/500/5,000; 0-10/100/1,000; 0- 5/50/500; 0-1/10/100
    • Accuracy¹: ±1% of full scale (± 5% of full scale on ranges ≤ 0-5ppm)
      • ¹Stated at constant temperature and constant pressure.
  • Linearity: ±1%
  • 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: (both sensor and electronics): 40° to 104° F (5° to 40° C)
  • Warranty: 2 years electronics, 1 year sensor


  • Display: 0.4″ (10.2 mm) high, 4-1/2 digit LCD
  • Resolution of Display: 0.1 ppm for ranges <100 ppm 1.0 ppm for ranges >100 ppm
  • Input Power: Universal 100-240 VAC, 50-60Hz or 18-32 VDC.
  • Outputs: 4-20 mADC and 0-2 VDC standard as is a TTL output for range identification. Optional RS-232C or RS-485 serial communication available.
  • Oxygen Alarm Relays: Three (3) SPDT Form C contacts rated 10 A @ 30 VDC/115/230 VAC. User selectable for fail-safe or non fail-safe.
  • Instrument Status Alarm: Rated identically to the O2 relays
  • Audible Alarm: Internal buzzer with audible cancel


  • Flow Rate: 1.0 to 2.0 SCFH (0.5 to 1.0 liter/min)
  • Sample Gas Temperature: 40° to 104° F (5° to 40° C)
  • Sample Gas Pressure: 0.1 to 1.5 psig (0.007 kg/cm² to 0.1 kg/cm²)
  • Entrained Solids: <3 mg/ft³: no in-line filter required >3 mg/ft³: in-line filter is required
  • Hydrocarbon Mist: <0.7 mg/ft³: no in-line filter required >0.7 mg/ft³: in-line filter is required


  • Electronics Control Unit: Polycarbonate enclosure with a hinged clear front cover.
  • Control Unit Dimensions: 9.45 in. (240.5 mm) height 6.50 in. (165.1 mm) width 6.20 inches (157.5 mm)
  • Note: All dimensions are without optional equipment
  • Gas Connections: 1/4″ stainless steel compression fittings.
  • Sensor Mounting: Local
  • Weight: 11 lbs (4.98 kg) (Standard Bench-top Configuration)
  • Other mechanical configurations available upon request

A Long-Lasting Trace Oxygen Sensor

The Series 3000 Trace Oxygen Analyzer features Alpha Omega Instrument’s long-life ambient temperature electrochemical sensor that has a functional life of up to three times that of most “fuel cell” type sensors. The enhanced mechanical design of the sensor ensures longer life, and virtually eliminates leakage of caustic electrolyte, a nagging (and expensive) problem associated with sensors that require periodic electrolyte maintenance. And, because the sensor is sealed, it is not position sensitive. In addition, unlike some electrochemical sensors, Alpha Omega Instruments readings from the Series 3000 do not require manual adjustment based on changes in the molecular weights of the sample gas i.e. helium, hydrogen, etc. a major advantage for continuous measuring applications. The output from the sensor is both linear and temperature compensated to provide optimum performance. The long-life trace oxygen sensor is installed in a high integrity-leak tested metal housing that is equipped with 1/4″ stainless steel compression fittings on both the sample gas inlet and outlet. Manual isolation valves are included at no additional charge.

Flexible Configurations for a Range of Uses

The Series 3000 Trace Oxygen Analyzer affords maximum flexibility to meet the increasing demands of the industrial, commercial, and educational markets. It is available in a wide number of optional mechanical configurations. Depending on the application, the Series 3000 can be equipped with a number of options including; sample filters, sample pumps, pressure regulators, block & bleed by-pass sampling systems, serial communications, solenoid valves with internal control connections, flow meters, etc.

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