The mounting of a vibration sensor directly impacts its performance. Incorrect mounting may give readings that relate not only to a change in conditions but also to the instability of the sensor itself – therefore making the sensor’s readings unreliable. As such, correct mounting of a vibration sensor is vital to ensure true readings.

To detect any faults in machine components, vibration sensors should be mounted in locations that ensure horizontal, vertical and axial movement are measured effectively:

• For horizontal measurement, vibration sensors should be mounted on the motor bearings and pump bearings. This measures velocity mm/sec (Peak or RMS) to detect unbalance and problems with structural rigidity and/or foundation.
• For vertical measurement, sensors should be located on the motor and pump drive-end bearings. This measures velocity mm/sec (Peak or RMS) to detect looseness and problems with structural rigidity and/or foundation.
• For axial measurement, sensors should be attached to the motor and pump drive-end bearings. This measures velocity mm/sec (Peak or RMS) to detect misalignment between the motor and the fan.

Accelerometers should be mounted onto a surface that is free from oil and grease as close as possible to the source of vibration. The surface should be smooth, unpainted, flat and larger than the base of the accelerometer itself. For best results, sensors should be mounted via a drilled and tapped hole directly to the machine housing.