Which condition commonly damages RTDs in pumps?
A. High motor current
B. Low humidity
C. Excessive vibration
D. High process temperature
View Answer
Answer: C
Explanation:
Excessive vibration is one of the most common causes of RTD damage in pumps, compressors, motors, and other rotating equipment.
Continuous vibration can cause:
Breakage of the RTD sensing element
Fatigue failure of internal wires
Loose terminal connections
Damage to insulation
Intermittent temperature readings
Why Pumps Are Challenging
Pumps often experience:
- Mechanical vibration
- Shaft imbalance
- Bearing wear
- Cavitation
- Hydraulic pulsations
Over time, these conditions can weaken and damage the RTD assembly.
Why Film RTDs Are Often Preferred
Film-type RTDs generally offer better vibration resistance than traditional wire-wound RTDs, making them suitable for pump and motor applications.
Why the Other Options Are Incorrect
High motor current
- May create electromagnetic interference but does not directly damage the RTD.
Low humidity
- Generally has little effect on RTD integrity.
High process temperature
- Can damage an RTD only if it exceeds the sensor’s design limits, but in pump applications, vibration is the more common cause of failure.
Because pumps are subjected to continuous mechanical stress and vibration, Option C (Excessive vibration) is the correct answer.