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Series 2500/2510

Percent Oxygen Transmitter

Percent Oxygen Transmitter with Excellent Speed of Response & Low Cost of Ownership

Our ALPHA OMEGA INSTRUMENTS™ Series 2500/2510™ Percent Oxygen Transmitters are blind transmitters designed to provide exceptional performance, accuracy, and stability.  Percent oxygen measurement ranges are available from 0-2% to 0-100%. The Series 2500/2510™ Percent Oxygen Transmitter is designed to provide accurate and dependable percent oxygen measurements in a variety of background gases. 

The Series 2500/2510 Percent Oxygen Transmitters 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. 

The Series 2500 is a true loop powered version, and the Series 2510 is the AC powered (115/230 VAC, 50-60 Hz) counterpart and is recommended when AC power is available or preferred. Also, available in optional 24 VDC. In addition to the optional equipment mentioned above, the Series 2510 can be equipped with a sample pump.

The Series 2500/2510 Percent Oxygen Transmitters feature an extended life oxygen sensor with EES (enhanced electrolyte system). This sensor provides exceptional performance, 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 even if exposed to 100% carbon dioxide.   In addition, the enhanced mechanical design of the sensor ensures longer life, and virtually eliminates leakage of electrolyte, a nagging (and expensive) problem associated with sensors that require periodic electrolyte maintenance.


    Here are some of the industries that use the Series 2500/2510 Percent Oxygen Transmitters:

    • Industrial Manufacturing: Used in industrial manufacturing processes to measure oxygen levels in combustion gases and exhaust streams.
    • Petrochemical: Used in the petrochemical industry to measure the oxygen content in refining and processing operations.
    • Semiconductor Manufacturing: Used in semiconductor manufacturing to measure the oxygen content in gas delivery systems and cleanroom environments.
    • Food and Beverage: Used in the food and beverage industry to monitor the oxygen content in packaging and storage environments.
    • Environmental Monitoring: Used in environmental monitoring applications to measure the oxygen content in ambient air and water.
    • Medical: Used in medical applications to monitor oxygen levels in patient airways and breathing circuits.
    • Aerospace: Used in aerospace applications to monitor the oxygen content in aircraft cabins and life support systems.

    • 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.
    • Wide Number of Ranges:  Measure from <0.1% to 100% Oxygen
    • Exceptional Speed of Response:  Responds Instantaneously to Changes in Oxygen
    • Rugged and Versatile Construction:  NEMA 4 Housing Withstands Harsh Environments
    • Economically Priced:  Save Thousands of Dollars vs Other Methods
    • Patented Extended Life Sensor:  Eliminates Frequent Sensor Replacement
    • Acid Gas Resistant Sensor:  Eliminates Sample Conditioning for Many Applications

    • Measurement Ranges: in percent 0-2, 0-5, 0-10, 0-25, 0-50, and 0-100
    • Accuracy¹: ±1% of full scale (± 5% of full scale on ranges ≤ 0-5%)
    • Linearity: + 1% of full scale.
    • Response Time: 90% of full scale in less than 20 seconds (typical).
    • Sensor Type: Long-life Electrochemical Sensor.
    • Temperature Compensation: Standard.
    • Operating Temperature Range: 40° to 104°F (5° to 40°C)
    • Warranty: Two years for the electronics and one year for the sensor.

    • Enclosure: Polycarbonate, rated NEMA 4X (IP66) without optional equipment. NEMA 7 (explosion proof) optional.
    • Dimensions: 6.5 in. (165.1 mm) height 7.0 in. (177.8 mm) width 3.9 in.(99.06 mm) depth. Note: All dimensions are without optional equipment
    • Gas Connections: Quick connect 1/4” OD for plastic tubing or stainless-steel compression fittings for installations with metal sample lines.

    • Series 2500 Loop Powered Trace Oxygen Transmitter Input power 14-32 VDC
    • Series 2510 Trace Oxygen Transmitter: Input power 115/230 VAC, 50-60 Hz, or 24 VDC.
    • Loop Resistance: 600 ohms @ 24 VDC (consult factory for other resistance values)

    • Sample Flow Rate: 1.0 to 2.0 standard cubic feet per hour (SCFH) 0.5 to 1.0 liters/ minute (LPM)
    • Sample Gas Pressure Limits: 0.1 to 1.5 psig (0.007 to 0.1 kg/cm2)

    We Care About Safety

    If you are concerned over unsafe levels of oxygen explore a complete line of oxygen deficiency monitors and accessories. We supply many instruments to medical, aerospace, and municipalities.  Occupational Safety and Health Administration (OSHA) defines an oxygen deficient environment when oxygen levels fall below 19.5 percent.  Oxygen deficient environments require accurate and reliable instrumentation. Oxygen levels below 16% is dangerous to human life.

    Explore why safety monitoring matters.


    The ALPHA OMEGA INSTRUMENTS trace and percent oxygen analyzers offer several benefits:

    • Accuracy: These analyzers are designed to provide highly accurate measurements of trace and percent oxygen levels in various applications, including industrial processes, medical facilities, and research laboratories.
    • Reliability:  Built to withstand harsh industrial environments and provide reliable and continuous monitoring of oxygen levels.
    • Flexibility: Can be customized to suit different applications and are available in various configurations, including portable, wall-mounted, and rack-mounted models.
    • Ease of use: Designed with user-friendly interfaces, making them easy to operate and maintain.
    • Low maintenance: These analyzers are low maintenance, with long-lasting sensors that require minimal calibration and replacement.
    • Cost-effective: Offer a cost-effective solution for oxygen monitoring, with low operational costs and a long service life.


    There are several benefits to using an oxygen monitor in various applications:

    • Safety: One of the primary benefits of using an oxygen monitor is improved safety. Oxygen monitors can alert workers, patients, or others to low oxygen levels, which can help to prevent accidents, injuries, and fatalities.
    • Compliance: In many industries, such as mining or chemical production, there are regulations and standards for oxygen levels that must be met. By using an oxygen monitor, companies can ensure compliance with these regulations and avoid fines or other penalties.
    • Efficiency: In industrial processes, monitoring oxygen levels can help to improve efficiency and reduce waste. By monitoring oxygen levels, companies can optimize processes and reduce the use of costly materials or energy.
    • Quality control: In food packaging or other applications where the oxygen concentration is critical to the quality of the product, oxygen monitors can help to ensure consistent quality and prevent spoilage.
    • Peace of mind: In medical applications or other settings where oxygen levels can be a critical factor, using an oxygen monitor can provide peace of mind to patients, workers, or others who may be concerned about their safety.
  • how do oxygen analyzers work?

    how do oxygen analyzers work?

    Oxygen analyzers function differently depending on their intended use application. There are two main application types–open diffuser applications and extractive applications. In an open diffuser application, the analyzer’s sensor is directly exposed to the ambient air surrounding it at close to atmospheric pressure. Conversely, in an extractive application, the sensor is installed in a sensor housing (small chamber) as part of a sampling system. Below, we explore how an analyzer works in each of these scenarios.

    Open Diffuser Applications

    Oxygen deficiency monitors are the primary example of analyzer technology used for an open diffuser application. In this scenario, no sampling system is needed, and the only requirements are continuous measurement and notification (i.e. alarms) of gas levels outside the desired range.

    For example, our ALPHA OMEGA INSTRUMENTS™ Series 1300 Oxygen Deficiency Monitor features an ambient temperature electrochemical sensor with an Enhanced Electrolyte System (EES) with a weak acid electrolyte system. The weak acid electrolyte system retards passivation of the sensor anode by allowing the products of oxidation to dissolve in the acid electrolyte. In effect, the sensor is renewed continuously as the weak acid electrolyte tolerates over 20 times the lead oxide (PbO) than potassium hydroxide (KOH) based sensors.

    The result is a sensor with a greatly extended useful life as well as providing exceptional measurement stability. By measuring the voltage that is a result of the electrochemical process, the oxygen concentration can be accurately determined.

    Another open diffuser scenario involves percent oxygen measurements within processes using environmental control chambers. Some examples are glove boxes, anaerobic chambers, and food packaging machines where an open diffuser sensor can be utilized as long as the chamber pressure is at atmosphere or ≤1.5 psig. For this need, our OXY-SEN™ Oxygen Monitor and Series 2000 Percent Oxygen Analyzer (with our OXY-SEN™ sensor) are both suitable.

    Another option for an environmental control chamber application is to use analyzers that are equipped with an extractive sample system, including a pump directly inside the environmental chamber, conditions permitting. Our battery-operated portables Series 2520 (percent) and Series 3520 (trace) are great options for this application. If, however, conditions do not permit locating the instrument in the environment, then we recommend using one of our instruments with an extractive sample system outside the chamber.

    Extractive Applications

    Most process applications measure gases from a process rather than an ambient environment. In the process, there are conditions (e.g. pressure, temperature, relative humidity, etc.) that may vary widely, so “extracting” and conditioning a sample may be required. In extractive applications, the sensor is installed in a housing (small chamber) as part of a sampling system. As the sample gas passes through the sensor housing, the voltage produced by the electrochemical process can be measured and the oxygen concentration can be determined accurately.

    For extractive applications requiring percent level measurements, our Series 2000, 2500, 2510 and 2520 analyzers feature an extended life oxygen sensor with a weak acid electrolyte system. The weak acid electrolyte system retards passivation of the sensor anode by allowing the products of oxidation to dissolve in the acid electrolyte. In effect, the sensor is renewed continuously as the weak acid electrolyte tolerates over 20 times the lead oxide (PbO) than potassium hydroxide (KOH) based sensors. The result is a sensor with a greatly extended useful life. Different options are available to meet your sample condition requirements.

    For extractive applications requiring trace (ppm) level measurements, our Series 3000, 3500, 3510 and 3520 trace oxygen analyzers feature an advanced trace oxygen sensor. This sensor is a lead-oxygen battery comprised of a lead anode, a gold-plated cathode, and an electrolyte consisting of potassium hydroxide.

    For applications with CO2, we also have a sensor with an electrolyte that is a weak acid, so that it can handle up to 100% CO2. All of our trace level instruments come with manual isolation valves so the sensor can be isolated from ambient levels of oxygen when they are not being used to measure trace level process gases. Different options are available to meet your sample condition requirements.


    When purchasing an oxygen deficiency monitor, there are several factors to consider ensuring that you choose the best device for your needs. Here are some key considerations:

    • Measurement range: Choose a monitor that can measure oxygen levels within the range required for your specific application. Some monitors may only be able to measure oxygen levels between 0-25%, while others may have a wider range.
    • Accuracy: Look for a monitor with high accuracy and precision to ensure that the readings are reliable and consistent.
    • Response time: Consider the response time of the monitor. In some applications, a faster response time may be necessary to detect oxygen depletion quickly and prevent dangerous situations.
    • Alarm function: Look for a monitor with an alarm function that can alert users when oxygen levels fall below a safe threshold. Some monitors may have both audible and visual alarms.
    • Calibration: Choose a monitor that is easy to calibrate and maintain. Some monitors may require regular calibration to ensure accuracy.
    • Portability: Consider whether the monitor is portable and easy to move between different locations. Some monitors may be designed for permanent installation, while others are more portable.
    • Price: Consider the cost of the monitor and ensure that it fits within your budget. However, it is important not to compromise on quality or accuracy for the sake of a lower price.

    It is important to carefully consider these factors when purchasing an oxygen deficiency monitor to ensure that you choose a device that meets your specific requirements and provides accurate and reliable readings.

  • rohs-reach


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.


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

Process Insights is committed to solving our customers’ most complex analytical and process challenges.  


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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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