Reliable Oxygen Detection for Safety and Performance
Alphasense offers a range of oxygen gas sensors designed for industrial safety, combustion analysis, and process control, suitable for both portable and fixed gas detection devices. These sensors vary by technology, compliance, lifetime, size, concentration range, and special features to meet diverse application requirements.
By Technology
Choose based on compliance, instrument lifecycle stage and application-specific needs.
Lead-Free Galvanic
RoHS-compliant, 2y life, zero-bias, fast response safety oxygen sensors. Drop-in replacements for A-sized, lead-based safety oxygen sensors – ideal for extending the lifecycle of
existing gas monitors and new instrument designs.
· O2-A2-GLF | O2-A2S-GLF
Lead-Free Amperometric
RoHS-compliant, long-life sensors for safety and process control. Great for new instruments.
LFO2-A1 | LFO2-AL | LFO2-AH
·Lead-Based Galvanic
Proven technology with fast response and no bias requirements. Industry standard safety oxygen sensors.
O2-A1 | O2-A2 | O2-A3 | O2-C2 | O2-G2
Special Features
Tailored for unique integration or environmental challenges:
O2-C2: Carbon cloth filter for combustion gases
O2-G2: Space-saving ½ height design for wearables
O2-A2Ni: Nickel pins for soldering
O2-A2S | O2-A3S: No foam seal for custom sealing
By Lifetime
· 1-Year Sensors (2-pin, zero bias)
Ideal for high-sensitivity applications where sensitivity is more important than sensor lifetime.
O2-A1
· 2-Year Sensors (2-pin, zero bias)
Balanced performance and longevity for general industrial safety and portable instruments
O2-A2-GLF | O2-A2S-GLF (Safety)
O2-A2 | O2-A2Ni | O2-A2S (Safety)
O2-C2 (Combustion)
O2-G2 (Compact, Safety)
· 3-Year Sensors (2-pin, zero bias)
Extended life for fixed installations or long-term deployments with minimal maintenance
O2-A3 | O2-A3S
· 5-Year Sensors (3-pin, bias required)
For applications requiring long-life and lead-free RoHS compliance.
LFO2-A1 (0–30%)
LFO2-AL (0–95%)
LFO2-AH (0–2%)
By Size
Choose based on available space and device form factor.
· Standard Profile (A-Series)
Suitable for most portable and fixed instruments.
Galvanic Lead-Free: O2-A2-GLF | O2-A2S-GLF
Amperometric Lead-Free: LFO2-A1 | LFO2-AL | LFO2-AH
Lead-based: O2-A1 | O2-A2 | O2-A2S | O2-A2-Ni | O2-A3 | O2-A3S
· Low Profile / Compact (G-Series)
Designed for wearable or space-constrained devices.
O2-G2
· Special Form Factor (C-Series)
Includes protective features for harsh environments like flue gas analysis.
O2-C2
By Concentration Range
Choose based on the oxygen levels you need to measure.
· General Range (0–30%)
Covers ambient and enriched oxygen environments.
Galvanic Lead-Free: O2-A2-GLF | O2-A2S-GLF
Amperometric Lead-Free: LFO2-A1
Lead-based: O2-A1 | O2-A2 | O2-A2S | O2-A2-Ni | O2-A3 | O2-A3S
Special: O2-C2 | O2-G2
· High Range (up to 95%)
For industrial processes requiring high oxygen purity monitoring.
LFO2-AL
· Low Range (0–2%)
For trace oxygen detection in inert or controlled atmospheres.
LFO2-AH