SRX-CT21A % Oxygen Sensor – Replaces Teledyne R-21A

Model SRX-CT21A % Oxygen Sensor

The Model SRX-CT21A % Oxygen Sensor utilizes galvanic micro fuel cell technology specifically engineered for oxygen measurement in automotive exhaust, thereby ensuring accurate and dependable performance in critical applications.

The SRX-CT21A % oxygen sensor serves as a direct replacement for several widely used models, including Teledyne R-21A, part number C43981-R21A. As a result, users can integrate this sensor into existing systems without requiring any modifications in the analyzer electronics.

In terms of design, the sensor features a 3 PIN Molex electrical connection along with an M16x1 threaded front, which simplifies installation and ensures secure mechanical fitment.

To ensure consistent quality, AST subjects each sensor to rigorous testing, including output verification, 24-hour stability testing, and gas leakage testing at 30 inches of water column pressure. Consequently, every unit meets strict performance and reliability standards prior to deployment.

Furthermore, the sensor incorporates a proprietary electrolyte formulation, a super-activated anode, and a uniquely engineered anode structure. Together, these features maximize utilization of the lead (Pb) anode, extend operational life, and minimize signal drift. As a result, the sensor reduces the need for frequent calibration while maintaining long-term stability.

The sensor uses a very thin oxygen-sensing membrane, allowing oxygen to diffuse rapidly through the membrane. As a result, the sensor provides a very fast response time, with a 90% response to a step change in oxygen concentration in less than 5 seconds.

CAUTION:

1. Users must verify AST sensor’s compatibility with their intended equipment before installation.
2. Although the sensor offers enhanced stability, users should calibrate it before use.
3. Follow the instructions in the Owner’s Manual for calibration of the sensor

AST designs, develops, and manufactures all of its sensors in the United States, thereby ensuring high standards of quality, consistency, and reliability.