Why Dew Poin is negative in Class 2 Instrument Air System ??
The dew point in a Class 2 Instrument Air System is kept negative to ensure that the air is extremely dry. This prevents moisture from condensing within the system, which could lead to corrosion, freezing, or damage to sensitive instruments and pneumatic components.
A negative dew point means the air temperature would have to drop below freezing before any moisture would condense, ensuring reliable and safe operation of the instruments in varying environmental conditions.