Gas sensor type:NO2 Sensor failed at 21:06 on 29 Nov 2018. Failed sensor serial number:202100007 (Date code 107) Serial number of new sensor:240500559 (Date code 098) Notified 05/12/18 Received 11/12/18 Replaced 12/12/18 Please allow 2-3 days for new sensor to stabilise.