Replacement to Figaro KE-25 Oxygen Sensor – SRZ-CF25

AST offers SRZ-CF25 Oxygen Sensor as a direct replacement to Figaro KE-25 oxygen sensor. The SRZ-CF25 oxygen sensor is a high-performance electrochemical oxygen sensor designed for accurate percent-level oxygen measurement in challenging gas environments. Many industrial processes involve reactive or acidic gases. The drop-in design of this sensor simplifies installation and helps minimize equipment downtime. The Figaro KE-25 oxygen sensor replacement by AST is particularly well suited for measuring oxygen concentrations in gas streams containing high levels of acid gases such as CO₂. Conventional oxygen sensors can experience performance challenges in these environments.

The sensor design combines a super-activated Pb anode material, a smooth-surfaced cathode, and a proprietary electrolyte mixture. Together, these components promote efficient utilization of the anode material, resulting in excellent long-term stability and measurement accuracy. In addition, an onboard thermistor-resistor network compensates the sensor signal for temperature variations. Therefore, the sensor maintains stable performance even when ambient temperature fluctuates.

The sensor uses a proprietary electrolyte formulation that improves tolerance to gas streams containing high levels of CO₂ and trace amounts of H₂S and SO₂ gases. To ensure consistent performance, AST thoroughly tests every sensor for output and stability. Although the SRZ-CF25 % Oxygen Sensor specifically targets oxygen measurement in acid gas environments, its capabilities extend beyond these applications. Users can also employ the sensor to measure oxygen in inert gas streams.

AST designs, develops, and manufactures all of its oxygen sensors in the USA. By controlling the entire engineering and manufacturing process, AST maintains consistent quality and performance from development through production. This approach allows AST to focus specifically on oxygen-sensing technology and deliver sensors designed for demanding industrial applications.

FIGARO Model KE-25