Gas sensor type:NO2 Sensor failed at 20:28 on 29 Nov 2018. Failed sensor serial number:202280044 (Date Code 117) Serial number of new sensor:240500550 (Date Code 098) Notified 05/12/18 Received 11/12/18 Replaced 12/12/18 Please allow 2-3 days for new sensor to stabilize.