SRZ-MA333 PPM O2 Sensor – Replacement to XLT-12-333 and OXY-T-2 O2 Sensor

SRZ-MA333 PPM O₂ Sensor

The SRZ-MA333 PPM O₂ Sensor is a direct replacement for the Analytical Industries (AII) XLT-12-333 PPM O₂ Sensor. The sensor is a high-performance electrochemical micro fuel cell designed for accurate trace oxygen measurement in gas streams containing high concentrations of carbon dioxide (CO₂) and trace levels of acidic gases. Applied Sensing Technologies (AST) designed this sensor as a direct replacement . As a result, users can install the sensor without modifying their existing analyzers.

With a signal output greater than 600 µA in ambient air, the SRZ-MA333 oxygen sensor provides an excellent signal-to-noise ratio. Consequently, it delivers stable and reliable oxygen measurements, even at very low PPM oxygen concentrations.

SRZ-MA333 PPM O₂ Sensor for CO₂ Applications

The SRZ-MA333 PPM O₂ Sensor measures oxygen from high PPM down to low PPM levels in gas streams containing elevated CO₂ concentrations. In addition, it performs exceptionally well in gas streams containing trace amounts of acidic gases such as H₂S.

Unlike conventional PPM oxygen sensors, the SRZ-MA333 uses a proprietary electrolyte that resists the effects of CO₂. Therefore, the sensor delivers stable readings and excellent long-term performance in demanding process applications.

Typical applications include:

• CO₂ purification systems
• Food and beverage CO₂ production
• Carbon dioxide recovery systems
• Fermentation processes
• Industrial process gas analyzers
• Process gas sampling systems

SRZ-MA333 PPM O₂ Sensor Features

The SRZ-MA333 PPM O₂ Sensor combines a super-activated lead anode with AST’s proprietary electrolyte technology. As a result, the sensor offers:

• Fast response to oxygen changes
• Rapid recovery after exposure to air
• Excellent long-term stability
• High signal output (>600 µA in air)
• Low maintenance requirements
• Long operating life of 12–18 months

Typically, the sensor recovers from ambient air to below 10 PPM O₂ in less than 60 minutes. Consequently, operators can return analyzers to service quickly after calibration or maintenance.

Furthermore, the proprietary electrolyte maintains excellent performance across the recommended operating temperature range, including temperatures near freezing.

SRZ-MA333 PPM O₂ Sensor Gas Compatibility

The SRZ-MA333 PPM O₂ Sensor is recommended for oxygen measurement in:

• Carbon dioxide (CO₂)
• CO₂-rich process gas streams
• Gas streams containing trace levels of H₂S
• Inert gas mixtures containing elevated CO₂
• Industrial gas sampling systems

For inert gases and gaseous hydrocarbon streams that do not contain high CO₂ concentrations, AST recommends the SRX-MA333 PPM O₂ Sensor.

However, neither the SRZ-MA333 PPM O₂ Sensor nor the SRX-MA333 PPM O₂ Sensor should be used in highly reactive or corrosive gases, including  Sulfur hexafluoride (SF₆), Hydrogen chloride (HCl) and Ammonia (NH₃).

Direct Replacement for AII XLT-12-333

The SRZ-MA333 PPM O₂ Sensor is a direct replacement for the Analytical Industries (AII) XLT-12-333 PPM O₂ Sensor. Because it matches the mechanical and electrical characteristics of the original sensor, installation is fast and straightforward. Therefore, users can replace the sensor without modifying their analyzer.

Designed and Manufactured in the USA

Applied Sensing Technologies designs, develops, and manufactures the SRZ-MA333 PPM O₂ Sensor in the USA. In addition, every sensor undergoes rigorous quality testing to ensure consistent performance and long-term reliability.