To assist in determining whether your CO2 Gas Sensor is the current model or an earlier one, the image below will help.

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The newer model was introduced in January of 2007 and the other was retired at that time. Both of these sensors use the white BTA connector and auto-identify when connected to a functional interface. An even earlier version of the older style used a 5-pin DIN connector, and did not include the auto-ID feature. The DIN model has not been sold since the late ’90’s.