What are the power requirements for sensors?
Two electrode sensors such as the oxygen sensors and 2 electrode carbon monoxide sensors are self powered and thus have no power consumption themselves. Three and four electrode sensors must be run on a special potentiostatic circuit, which thus requires a power supply. In essence the sensor still doesn’t require power as it generates the output current directly from the oxidation or reduction of the target gas however since the amplifiers in the circuitry are not perfect they consume some standing current. This can generally be reduced to a very low level if necessary.
