Custom MOX-2 Medical Grade Oxygen Detector - Temperature Compensated for Ventilators

The whole issue with ventilator oxygen monitoring is you need something that doesn't drift when patient's environment shifts temperature or humidity — that's basically the MOX-2's whole reason for being. It's a partial pressure electrochemical sensor, and we've seen it hold rock-solid even when the room goes from a cold OR to a humid recovery bay.

It measures from 0 mBar to 1500 mBar O2, which covers pretty much any ventilator scenario you'd throw at it, and the output signal sits between 9 mV and 13 mV in 210 mBar O2 — that's a pretty tight window that makes calibration straightforward. The temperature compensation is the key though, because without it you'd be chasing readings across a -20°C to +50°C range, and that's just not practical for critical care. Actually, the built-in compensation keeps accuracy within 2% O2 equivalent across that span, so you're not constantly re-zeroing. The humidity range goes from 0% to 99% RH non-condensing, which is better than most industiral sensors we've handled — they usually top out around 85% or so. It's a Class II medical device, CE certified, and made in the UK, so you're looking at a proper medical-grade piece of kit.

Housing is white ABS, weighs 42 grams nominal, and uses a 3.5 mm mini phone jack for connection — simple, effective, and easy to swap out in a pinch. We usually stock these, but confirm lead time if you need more than 50 units.

One thing most buyers don't ask about but should: the sensor's output is linear with partial pressure, not concentration, so if your ventilator uses barometric pressrue compensation you'll need to account for that — it's not suited for direct ambient air monitoring without correction. But for anesthesia ventilators or any closed-circuit O2 loop, it's basically plug-and-play.

The operating pressure range is 0.5 Bar to 2.0 Bar, so it handles both low-flow and high-flow systems fine, and the connector type is standard enough that most OEM cables work without adapters. 1500 mBar O2 is the top end, which means it covers hyperbaric application too, though that's niche — most buyers go with teh standard ventilator setup.