AII-11-75D Oxygen Sensor (TruMix 4001) is an OEM replacement for the oxygen sensor in the Analytic Industries TruMix 4001 Trimix analyzer. Expected life of this sensor is typically 36 months (and sometimes longer) depending on usage and handling of the analyzer, but can be as little as 12 months in near continuous shop use.

We are occasionally asked about availability of the helium sensor for the Trumix analyzer. They are available by special order, but AII tells us the helium sensor has an expected life up to 10 years. The helium analysis is dependent upon an accurate oxygen analysis. For example, with an expired oxygen sensor when attempting an air calibration the indicated analysis for oxygen will be too low and helium will be too high. Once a fresh oxygen sensor is installed and the analyzer is calibrated, the helium analysis will also indicate correctly as well.

We are a high volume retailer of AI brand diving sensors, assuring that replacement sensors ordered from Dive Gear Express are always among the freshest available. Due to the unique nature of the product, this diving grade oxygen sensor is NON-RETURNABLE. Your complete satisfaction is our goal, so please consider carefully before purchase.