AO2 CiTiceL®
Oxygen (O2
) Gas Sensor
Poisoning
CiTiceLs are designed for operation in a wide range of environments and harsh conditions. However, it is important that exposure to high concentrations of solvent vapours is avoided, both during storage, fitting into instruments and operation.
When using sensors with printed circuit boards (PCBs), degreasing agents should be used before the sensor is
fitted. Do not glue directly on or near the CiTiceL as the solvent may cause crazing of the plastic.
Mechanical Installation
When installing the sensor, it must only be screwed in hand-tight and a gas tight seal ensured. Spanners and similar mechanical aids may not be used, as excessive force may damage the sensor thread.
Cross Sensitivity Table
Whilst CiTiceLs are designed to be highly specific to the gas they are intended to measure, they will still respond to some degree to various other gases. The table below is not exclusive and other gases not included in the table may still cause a sensor to react.
The AO2 has been tested with a number of gases which may be present in automotive exhaust to establish their level of cross interference.
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 |
Technical Specifications |
|
| MEASUREMENT | |
| Operating Principle | Partial Pressure Electrochemical |
| Measurement Range | 0-100% O2 |
| Output* | 9 – 13 mV in Air |
| Response Time (T90)* | <5 s |
| Response Time (T 99.5) | <40 s |
| Baseline Offset* | <20 mV |
| Linearity | Linear 0-100% O2 |
| ELECTRICAL | |
| On Board Temperature | <2% O2 equivalent |
| Compensation | variation from 0°C to 40°C |
| External Load Resitor | 10 kW Minimum |
| Connector | 3 Pin Molex header (MOLEX 22-29-2031) |
| Recommended Mating Part | Molex 3-Way Housing (MOLEX 22-01-2035) |
| Molex Crimp Terminals (MOLEX 08-45-0110) | |
| MECHANICAL | |
| Material | 40 g (nominal) |
| Weight Housing | Red ABS |
| Orientation | Any |
| Environmental | |
| Typical Application | Vehicle Exhaust Analysis |
| Operating Temperature Range | -20°C to +50°C |
| Operating Pressure Range | 0.5 – 2.0 Bar |
| Differential Pressure Range | 0 to 500 mBar max |
| Operating Humidity Range | 0 – 99% RH non-condensing |
| LIFETIME | |
| Long Term Ouput Drift in 100% O2 | <10% signal loss/year |
| Expected Operating Life | 360,000% O2 hours at 20°C 286,000% O2 hours at 40°C or 2 years in air at STP. |
| Packaging | Sealed blister |
| Specifications are valid at 20°C, 50% RH and 1013 mBar, using City Technology recommended circuitry. Performance characteristics outline the performance of sensors supplied within the first 3 months. Output signal can drift below the lower limit over time. | |