Nine Questions and Nine Answers for Industrial Vibration Sensor Selection
Selecting an accelerometer for predictive maintenance is a daunting task, even for experienced engineers. This process can usually be filtered into nine questions. Find out the answers to the following nine questions, apply them according to your actual situation, and you will be able to find the vibration monitoring solution.
Question 1: What do you want to measure? This may seem obvious, but think twice. What are you really trying to measure? In other words, what do you want to do? What do you hope to get? What are you going to do with the data? Accelerometers monitor vibration and provide raw vibration data, while vibration transmitters provide root mean square (RMS) values. It is useful to analyze raw vibration data because it contains information on all vibration signals, true peak amplitude and vibration frequency. Because the RMS total or peak value is a continuous 4-20 mA signal, it is very useful in eg PLC, DCS, SCADA systems and PI control systems. Some applications use both signals at the same time. By identifying the various signals required by the application, the search can be narrowed down considerably. Also, are you measuring vibration using acceleration or velocity or displacement? Have you considered that some industrial sensors can output vibration and temperature at the same time? Later, some field applications, such as vertical pumps, can monitor more than one shaft vibration. Does your field application require uniaxial, biaxial or triaxial measurement?