AO2 CiTiceL Oxygen (O2) Gas Sensor AA428-210 | City Technology

AO2 CiTiceL® Oxygen (O2) Gas Sensor - Part Number AA428-210

AO2 CiTiceL Oxygen (O2) Gas Sensor AA428-210 | City Technology

High-performance AO2 CiTiceL Oxygen Sensor (AA428-210) for oxygen analysis. Features 0-100% range, fast <5s response time, and linear output. Shop at Sensorcheap.com

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AO2 CiTiceL® Oxygen (O2) Gas Sensor – Part Number: AA428-210

The AO2 CiTiceL® is a high-quality partial pressure electrochemical oxygen sensor specifically designed for vehicle exhaust analysis. As a leading-edge sensor from City Technology, the AA428-210 model offers a linear output from 0-100% O2 and features an integrated 3-pin Molex connector for secure electrical interfacing.

Renowned for its reliability and fast response time, the AO2 sensor is the industry standard for automotive emission testing equipment and safety-critical oxygen monitoring.

Key Features & Benefits

  • Optimized for Automotive: Specifically designed for vehicle exhaust analysis.

  • Linear Output: Provides a consistent linear signal across the entire 0-100% Oxygen range.

  • Fast Response: T90 response time of less than 5 seconds for real-time monitoring.

  • Easy Installation: Equipped with a standard 3-Pin Molex header for quick integration.

  • Temperature Compensated: Features on-board compensation to maintain accuracy across varying temperatures.

Technical Specifications

Measurement Category Specification Details
Operating Principle Partial Pressure Electrochemical
Measurement Range 0 – 100% O2
Output Signal 9 – 13 mV in Air
Response Time (T90) < 5 seconds
Response Time (T99.5) < 40 seconds (from 20.9% to 0.1% O2)
Baseline Offset < 20 µV
Linearity Linear 0-100% O2

Electrical & Mechanical Details

Property Value
Connector 3 Pin Molex header (MOLEX 22-29-2031)
Recommended Mating Part Molex 3-Way Housing (22-01-2035) & Terminals (08-45-0110)
External Load Resistor 10 kΩ Minimum
Weight 40 g (nominal)
Housing Material Red ABS
Orientation Any

Environmental & Lifetime

Condition Operating Range / Value
Typical Application Vehicle Exhaust Analysis
Operating Temperature -20°C to +50°C
Operating Pressure 0.5 – 2.0 Bar
Differential Pressure 0 – 500 mBar max
Operating Humidity 0 – 99% RH non-condensing
Long Term Output Drift <10% signal loss / year
Expected Operating Life 360,000% O2 hours @ 20°C (approx. 2 years in air)

Cross-Sensitivity Data

The AO2 CiTiceL is designed to be highly specific to Oxygen, but it may respond to other gases present in automotive exhaust.

Interfering Gas Concentration Balance % O2 Equivalent
Carbon Dioxide (CO2) 16% N2 < 0.1%
Carbon Monoxide (CO) 6% N2 < 0.1%
Nitric Oxide (NO) 3000 ppm N2 < 0.1%
n-Hexane 2000 ppm N2 < 0.1%
Hydrogen (H2) 5000 ppm N2 < 0.1%

Installation & Safety Notes

  • Installation: Hand-tighten only. Do not use spanners or mechanical aids, as excessive force may damage the sensor thread.

  • Soldering: DO NOT solder to the connector pins. Connection must be made via PCB sockets or the recommended Molex mating parts to avoid internal damage.

  • Chemical Exposure: Avoid high concentrations of solvent vapors during storage and installation. Do not use glue directly on or near the sensor.

  • Safety Check: This is a safety-critical component. It is required to perform a “bump check” (exposure to target gas) before each use to ensure proper functionality.

Order Information:

  • Product: AO2 CiTiceL Oxygen Sensor

  • Part Number: AA428-210

  • Brand: City Technology

Contact Sensorcheap today for bulk pricing and technical support!

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