| 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
|
Inferior |
Superior |
|
5. Instrument cost |
Lower if installation cost are not considered |
Higher. |
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