SRX-CT21 % O2 Sensor – Replacement to Teledyne Class B-1C

SRX-CT21 % Oxygen Sensor – Fast response  sensor

The SRX-CT21 % oxygen sensor from Applied Sensing Technologies (AST) supports industrial process gas analysis that requires fast response and high measurement accuracy. Because many industrial processes depend on rapid oxygen detection, this sensor delivers reliable performance and stable signal output for percent-level oxygen monitoring.

Replacement Compatibility

The SRX-CT21 O₂ sensor serves as a direct drop-in replacement for several widely used oxygen sensors, including:

• Teledyne Analytical Instruments – Class B-1 and B-1C Part number C06689-B1C

• Analytical Industries Inc – PSR-11-21

Because the sensor matches the mechanical and electrical configuration of these models, technicians can install it easily without modifying the analyzer.

Fast Response and Reliable Performance

In demanding process monitoring applications, response time plays a critical role. Therefore, this sensor uses a thin sensing membrane that delivers a T90 response time of under 6 seconds, allowing operators to detect oxygen concentration changes quickly.

Under ambient temperature and pressure conditions, the sensor provides an expected operating life of approximately 9-12 months. This combination of fast response and dependable service life makes it suitable for continuous industrial oxygen monitoring.

The sensor uses a proprietary electrolyte mixture, unique anode configuration and other internal sensor components ensures full utilization of the anode material. These features improves the accuracy and long term stability of the sensor and it does not demand frequent calibration.

All oxygen sensors go through a thorough output test, stability in air test and where necessary, stability in nitrogen gas.

Designed and Manufactured in the USA

Applied Sensing Technologies designs, develops, and manufactures all of its percentage and PPM oxygen sensors in the United States. By maintaining full control over engineering and production, AST ensures consistent quality, oxygen-specific performance, and reliable operation in industrial oxygen analyzer systems.