If a temperature sensor reaches 61C, a timer is started and the admin is warned with an ALERT level message being logged with the message 'Critical temperature reading' . This timer expires in two min...If a temperature sensor reaches 61C, a timer is started and the admin is warned with an ALERT level message being logged with the message 'Critical temperature reading' . This timer expires in two minutes. If a temperature sensor reaches 0C, a timer is started and the admin is warned with an ALERT level message being logged with the message 'Critical temperature reading' . This timer expires in two minutes.