O2-A2 Oxygen Sensor (O2 Sensor) Description
Alphasense Oxygen sensors use capillary flow control.
Unlike partial pressure oxygen sensors, they have good pressure and temperature dependence, making them the best choice in safety applications.
Standard galavanic sensors use lead for greatest reliability but fixed lifetime.
Sensors are available in three sizes:
A: 20mm diameter, the industry standard size for portable gas detectors
C: 20mm diameter, extra height allows additional filter material when measuring combustion gas
G: Miniature, proven long-term performance. The sensors are designed for the next generation of portable gas detectors. Part of the Alphasense 'D' family.
| O2-A2 Oxygen Sensor PERFORMANCE | |
| Output | μA at 20.9% O2 | 80 to 120 |
| Response time | t90 (s) from 20.9% to 0% O2 | < 15 |
| Zero current | μA in N2 | < 2.5 |
| Linearity | % O2 deviation at 10% O2 | 0.6 |
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| O2-A2 Oxygen Sensor LIFETIME | |
| Output drift | % change in output at 3 months | < 1 |
| Operating life | months until 85% original output of 20.9% O2 | > 24 |
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| O2-A2 Oxygen Sensor ENVIRONMENTAL | |
| Humidity Sensitivity | % O2 change: 0% to 95% rh at 40℃ | < 0.7 |
| CO sensitivity | % (change O2 reading) / % CO2 at 5% CO2 | 0.1 |
| Pressure sensitivity | (% change of output)/(% change of pressure) at 20kPa | < 0.1 |
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| O2-A2 Oxygen Sensor KEY SPECIFICATIONS | |
| Temperature range | ℃ | -30 to 55 |
| Pressure range | kPa | 80 to 120 |
| Humidity range | % rh non-condensing (0 to 99% rh short term) | 5 to 95 |
| Storage period | months at 3 to 20℃ (store in sealed pot, open circuit) | 6 |
| Load resistor | Ω (recommended) | 47 to 100 |
| Diameter | mm (including label) | 20 |
| Height | mm (including foam ring) | 17.4 |
| Weight | g | < 16 |
