To determine whether your CO2 Gas Sensor (CO2-BTA) is the current model or an earlier one, compare your sensor to the images below. 

• Sensors sold from June of 2023 are black with a rounded top. The label is red with white lettering. 
• Sensors sold from May 2007 to May of 2023 have a round top, and are black with a black label with white lettering. Two red o-rings frame the label. 
• Sensors sold before April 2007 are rectangular in shape with a sensor shaft extending from the box. They are black with a white label with teal lettering.

CO2 Gas Sensor introduced in the summer of 2023. 

The CO2 Gas Sensor sold from January of 2007 to May of 2023. 

The CO2 Gas Sensor sold before 2007

All three of the models above 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.