Comparison of Pneumatic and Electronic Control Systems

Feature Pneumatic Electronic
1.  Transmission distance Limited to about

100 meters


Practically unlimited
2.  Reliability Superior if energized

with clean air.

Excellent under eviromental condition


3. Operation in hazardous location(explosive atmosphere ) Completely safe Intrinsically safe equipment available—

Equipment must be removed for most maintenance


4. Ease and cost of Installation







5.  Instrument cost


Lower if installation

cost are not considered




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