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Oxygen Sensor (O2 Sensor) - O2-A2

  • Oxygen Sensor (O2 Sensor)
  • Oxygen Sensor (O2 Sensor)
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– 2 year warranty
– High-performance leak-free O2 Sensor
– Less than 1% change in output over 3 months
– T90 of less than 15 seconds
– < 0.7% Humidity affect
– < 0.1% CO2 Sensitivity
– Up to 99% humidity resistance

  • Model Number: O2-A2
  • Data Sheet: Date Sheet File
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Product Specification

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 gases
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 (O2 Sensor) Features

– 2 year warranty
– High-performance leak-free O2 Sensor
– Less than 1% change in output over 3 months
– T90 of less than 15 seconds
– < 0.7% Humidity affect
– < 0.1% CO2 Sensitivity
– Up to 99% humidity resistance


O2-A2 Oxygen Sensor PERFORMANCE
Output μA @ 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 @ 10% O2 0.6



O2-A2 Oxygen Sensor LIFETIME
Output drift % change in output @ 3 months < 1
Operating life months until 85% original output of 20.9% O2 > 24



O2-A2 Oxygen Sensor ENVIRONMENTAL
Humidity Sensitivity % O2  change: 0% to 95% rh @ 40℃ < 0.7
CO sensitivity % (change O2 reading) / % CO2  @ 5% CO2 0.1
Pressure sensitivity (% change of output)/(% change of pressure) @ 20kPa < 0.1



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 @ 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

Matched Transmitter board for O2-A2 O2 Sensor

Alphasense 4-20m Analogue Transmitter Board
   • Factory calibration, custom-set for immediate use
   • Wide operating voltage range
   • Low RFI susceptibility



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