AlphaSense O2-A2 Oxygen Sensor

O2-A2 Oxygen Sensor
Regular price $39.00 USD Sale price

Compare at $59.00 USD

POs or wholesale quantity discounts click here

The AlphaSense O2-A2 oxygen sensor is a replacement sensor for hand-held gas detectors that use the O2-A2 sensor.

Verify the sensor you are replacing has AlphaSense O2-A2 printed on the side before ordering. Due to our low prices we cannot accept returns for the wrong sensor.


  • Electrochemical (EC) sensor designed to last for up to 2 years
  • Good pressure and temperature independence
  • Small, compact & maintenance free

Replacement Oxygen Sensor for

  • BW Technologies GasAlert MicroClip XT
  • BW Technologies GasAlert Max XT-II
  • BW Technologies GasAlert Micro 5 PID
  • BW Technologies GasAlert Quattro
  • BW Technologies GasAlert Extreme GAXT-DL-2
  • BW Technologies GasAlert Extreme GAXT-DL-B-2
  • BW Equivalent part no. SR-X10-C1
  • MSA Solaris Orion Altair 4,5 (not 4X or 5X)
  • Fieldpiece SOX3
  • CityTech 4OX-2
  • Measurement Range: 0.1-20.9% Oxygen
  • Output @ 20.9% Oxygen: 80-120 uA
  • Output @ 0% O2: < 2.5 uA
  • Response Time: < 15 sec. t90 (s) from 20.9% to 0%
  • Linearity: 0.6% O2 deviation @ 10%
  • Output drift: < 1% change @ 3 months
  • Operating life: > 24 months until 85% original Output of 20.9%


  • Dimensions (sensor): 17.4mm x 20.3mm
  • Current Consumption: 10ma peak, < 3mW average

Verify the sensor you are replacing has "AlphaSense O2-A2" printed on the side before ordering. Due to our low prices we cannot accept returns for the wrong sensor ordered.


Sensor Pin Sockets - Manufacturers do not recommend soldering to the pins. Pin sockets can be purchased from Andon distributors. Click here to search for your sensor's socket. Select the brand PDF, find your sensor, then search for the Andon part number for your sensor's socket.

Customer Reviews

Based on 21 reviews
Oxygen sensors

Received quickly. Exactly as described. Website easy to use found them easily. Look forward to more business.

Quick and excellent

Thanks for best delivery!!!


AlphaSense O2-A2 Oxygen Sensor

Works great

Have bought these sensors several times, work great

highly efficient

ordered and acknowledged on Sunday, arrived in France Thursday, excellent service. Oh! And the part worked. Nice people also.

"Swift response and shipment. The product is easy to setup and use. It is just what I was looking for."

- Shima Tomohiro

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