How do vibrations affect temperature measurements?
Before we describe the case, we will first explain the effect vibrations can have on temperature measurements. Whether the vibrations are constant or sometimes occur with jolts, they will always result in mechanical stresses, consequently affecting the reliability and accuracy of sensors.
The most common problems caused by vibrations include damaged housings, dislodged cables, faulty signals, interrupted measurements, measurement deviations, and a short lifespan of the equipment. The best and simplest solution is to install the sensors as far from the source of vibration as possible. However, this is not always feasible and does not provide the necessary results for measuring and controlling a process. Only a custom sensor can provide a solution to measure under these conditions.
Case
H&B Sensors has developed a custom solution for a client who was experiencing problems with a Pt100 in a Chiller. The client wanted a very accurate measurement and therefore opted for a resistance thermometer (RTD) instead of a thermocouple. (Read here the differences between these two measurement methods) Due to the many vibrations, the operators were getting poor accuracy and repeatability. Because the resistance of the sensor noticeably changed, the sensor needed to be recalibrated constantly, and overall, this resulted in a shortened lifespan of the equipment.
By developing a special sensor that would be resistant to the many present vibrations, it would be possible to record accurate results. The sheath diameter has been increased, and the temperature detector is encased with Silastomer, which ensures long durability and flexibility. Additionally, Silastomer is very weather-resistant and withstands moisture, extreme temperatures, vibrations, ultraviolet radiation, freeze-thaw cycles, and most airborne chemicals.
We are happy to help you find or develop the right temperature sensor for your application. Contact us and speak with one of our specialists.
