Continious monitoring

Monitoring of full range of gases

Sometimes difficult to locate damage which cause leakage and oxygen to enter system

Requires frequent auditing of system

Can have time delay in gas readings as the tubes become longer, which in turn may be more prone to damage

Continious reading

can have gas and air velocity set up from the same sensor point with one system

Limited gas can be monitored

If mine power goes down, then system is on battery backup, which has limited life