A complete series of innovative Ultra Low Power NDIR-sensors for the reliable measurement of small concentrations of methane (CH4), carbon dioxide (CO2) and hydrocarbons (HC) will be shown by Unitronic at SENSOR+TEST 2016 in Nuremberg (May 10-12). The sensors possess a power consumption below 3.5mW, which is 50 times less than conventional gas sensors based on semiconductor or thermocatalytic technologies.