Alpha Omega Instruments Series 3000 Trace Oxygen Analyzer

Alpha Omega Instruments Series 3000 Trace Oxygen Analyzers are rugged, microprocessor-controlled oxygen analyzers 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 LED 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 comes equipped with standard RS-232C or optional RS-485 serial communications. – An optional CO2 tolerant sensor. – Made in the USA and priced competitively.

Alpha Omega Instruments Series 3000 Features

  • 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), 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.
  • Economically priced
  • Affords savings of up to 50% over other manufacturers trace oxygen analyzers
  • Wide Measurement Ranges
  • Measure from under 1 PPM to as high as 10,000 PPM oxygen.
  • Factory Calibration
  • Factory calibration included at no additional charge. Upon request, NIST calibration certificates available
  • Visual and Audible Alarms Included along with two analog recorder outputs.
  • Ensures the highest level of protection and reliability


  • 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. Standard RS-232C or optional RS-485 serial communication.
  • 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

Sample Gas Characteristics

  • 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

Alpha Omega Instruments Series 3000 Construction

  • 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: 11lbs (4.98 kg) (Standard Bench-top Configuration)

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