If they are to be subjected to severe mechanical vibration, such as air compressor duty, protection is required. Capacitive elements, the most common pressure sensor, are sensitive to stray magnetic fields if not well designed. They are also susceptible to variations in the process fluid dielectric constant. Force-balance elements are typically used in pneumatic transmitters. Placement can be critical because they are sensitive to shock and vibration.
Piezoelectric elements are sensitive to temperature changes.
Because of their sensitivity, these sensors typically require temperature compensation to counterbalance the effects. Strain-gauge elements are also sensitive to temperature variations and require compensation. There are many points to consider in a pressure sensing installation. All require care in both planning and execution. In addition, sensors should be separated from the process by an isolation valve.