ZRO 2000

Unmatched Technology & Value

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

Our ALPHA OMEGA INSTRUMENTS™ ZRO 2000™ Fast-Response Zirconia Oxygen Analyzer is designed to provide accurate and repeatable trace and percent oxygen measurements in a variety of gases.  Oxygen readings from parts per billion to 100% can be achieved with one instrument. The rugged and compact design of the ZRO 2000 makes it ideally suited for industrial applications where continuous oxygen measurements are required.  It is available for purchase on our online store.

The ZRO 2000 FAST-RESPONSE Oxygen Analyzer is a microprocessor-based instrument designed to measure gas phase oxygen concentrations over a range of 0-100%, and it exhibits fast response times resulting from the non-depleting zirconia oxygen sensor used in the ZRO 2000 Fast Response Oxygen Analyzer is a zirconia type that exhibits fast response times. The analyzer is housed in a NEMA 1 enclosure rated for general purpose use. The front panel contains five switches that provide access to the analyzer’s settings. Oxygen values are displayed on a 0.7″ (17.8 mm) high 6-digit liquid crystal display (LCD).

The instrument is equipped with two oxygen alarm relays. Both relays are Form C (SPDT) types rated at 10 amps at 115/230 VAC/ 30 VDC and are user configurable for fail-safe operation. In addition to the alarm relays, the ZRO 2000 FAST-RESPONSE Oxygen Analyzer has a built-in audible alarm and red LEDs for visual indication of an oxygen alarm condition. There are also two green LEDs to indicate whether the LCD is displaying parts per million (PPM) or percent (%). The audible alarm may be manually canceled at any time. If the audible alarm is canceled and the alarm event continues, indications of this condition will still be available through the front panel LEDs and relay contact(s). Two flow meters are standard equipment for the ZRO 2000 Fast Response Oxygen Analyzer, one for the “Sample Flow” and another for the “Bypass Flow”.

Our ZRO 2000 FAST-RESPONSE Oxygen Analyzer has a measuring range of 0.1 PPM to 100%. Input voltage 90-264 VAC, 50-60Hz has two scalable analog outputs are provided, 4-20 mADC and 0-20 mADC. Included is an easy to read, six-digit backlit LCD as well as two (2) SPDT Form C contacts rated 10A @ 30VDC/115/240 VAC. NOTE: Six-digit LCD – the backlit option is no longer available due to supply chain issues.

NOTE: It is essential that the metal sample tubing used to connect to the ZRO2000 be of oxygen service quality (no residual oils or particles on the inner surfaces). In addition, the sample gas should not contain any reducing gases such as any hydrocarbon-based gases, carbon monoxide, or hydrogen. Gases such as these can introduce significant error into the oxygen readings. 

  • Advanced Solid-State Sensor
  • Measures parts PPM to 100% oxygen
  • Non-depleting oxygen sensor
  • 24-bit processing digital technology
  • Responds in milliseconds


  • Measurement Ranges: 0% to 100%
  • Accuracy: Percent: ±2% of reading or 0.05% absolute whichever is greater. Trace: ±2% of reading or ±0.5ppm absolute whichever is greater.
    • NOTE: The sample gas used with the ZRO 2000 must not contain any hydrocarbon vapors, hydrogen, carbon monoxide, or other reducing gases. Sample tubing should be cleaned for oxygen service. Please consult the factory for additional information.
  • Response Time: < 5 seconds at 0.15 liters per minute (LPM) over 1 decade. The response time for measurements of less than 50 PPM or less depend to a great extent on the design of the sample delivery system including the materials used.
  • Sensor Type: Zirconium Oxide
  • Operating Temperature of Analyzer: 50° to 104°F (10° to 40°C)
  • Warranty: Two Years Electronics, One Year Sensor


  • Enclosure: Aluminum, rated NEMA 1
  • Enclosure Dimensions: 13 inches (330 mm) – length 10.71 inches (272 mm) – width 6.3 inches (160 mm) – height – Note: All dimensions are without optional equipment
  • Gas Connections: 1/4” stainless steel compression fittings


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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Process Insights_AOI ZRO 2000 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





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

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 2500/2510 EX™

ALPHA OMEGA INSTRUMENTS™ Percent Oxygen Transmitters Explosion Proof
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

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
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