Calibration Propane The measuring ranges depend on the sensors installed. Sensor Array - 282102: ppm 0 - 1.000 ppm propane UEG 0 - 100% UEG propane Vol.% 0 - 100 Vol.% propane Dual IR Sensor - 282103: UEG 0 - 100% UEG propane Vol.% 0 - 1,7 Vol.% propane Resolution is subject to chosen application and can be set within given limits.