| Device | Common Failure Mode | Diagnostic / Maintenance | |--------|---------------------|---------------------------| | DP flow | Impulse line plugging | Periodic blowdown; use remote diaphragm seals. Monitor “static pressure” trend. | | Radar level | Antenna coating | Check echo curve via Hart; schedule cleaning. Use purged antenna. | | pH electrode | Glass bulb fouling | Auto-cleaning (spray or ultrasonic); scheduled calibration every 1–4 weeks. | | Coriolis flow | Tube erosion/corrosion | Compare density reading with known fluid; monitor tube frequency. |
A well-engineered loop starts on the drawing board. If the design is flawed, no amount of maintenance can fix the performance. | Device | Common Failure Mode | Diagnostic
The trend is moving toward high-precision pneumatic and electric actuators that respond instantly to controller commands. Use purged antenna
Gone are the days of simple mechanical gauges. Modern measurements rely on sophisticated physics to provide real-time data. Design & Selection: | A well-engineered loop starts on the drawing board
