Ethylene Sensor Zero Calibration

The baseline or zero of the ethylene sensor is known to drift, especially the C₂H₄ ppb sensor. The zero calibration should be performed weekly. This can be done manually or automatically, as described below. In both cases, potassium permanganate (KMnO₄) is used to scrub ethylene from the gas and set the zero. Using PolarCept (water in Chamber In) is not necessary during the zero calibration.

It is not recommended to use N₂ gas to zero the C₂H₄ sensors. N₂ gas typically has hydrocarbon impurities which could create signal for the ethylene sensor. Standard ethylene gas (0 ppm) can be used to perform the zero calibration. To set zero for the PPM sensor only, navigate to Setup > Sensor > Sensor Selection > C₂H₄ PPB > OFF before proceeding with the following steps.