IR CO2 transmitter eSENSE is a new, low cost, state-of-the-art, maintenance-free (!) CO2 transmitter for installation in the climate zone or in the ventilation duct. eSENSE helps you save money by decreasing your energy consumption while creating a healthier indoor climate! . Sample link...... CO sensor Applicable in spaces such as public garages, truck terminals, tunnels and mines. Sensor rated life: 5 years! Sample link......