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Measurement direction for continous condition monitoring

The measuring direction should be in the direction of the main vibration. The main vibration is usually in radial direction to the shaft. In case of fixed bearings with high axial force absorption or axial bearings, the recommended measuring direction is axial to the shaft.

Installation guidelines

Machine

Description

Quantity
Sensors

Sensor Position

Alarms

Root issue

 
Axial Fan 1 Radial driven end of motor a-Peak
v-RMS
a-RMS
Temp
Impact Looseness Friction (bearing) Overheating

*Notation
a = acceleration
V = velocity
V = Vertical
H = Horizontal
DE = Driven end
NDE = Non-driven end

Radial Direct
Drive Fan
2 Radial V-DE and H-NDE of motor* a-Peak
v-RMS
a-RMS
Temp
Impact Looseness Friction (bearing) Overheating
Radial
Indirect Drive
Fan
4 Radial V-DE and H-NDE motor and fan shaft a-Peak
v-RMS
a-RMS
Temp
Impact Looseness Friction (bearing) Overheating
Centrifugal
Pump
4 Radial V-DE and H-NDE. motor and pump shaft a-Peak
v-RMS
a-RMS
Temp
Cavitation Looseness Friction (bearing) Overheating
Electric Motor 2 Radial V-DE and H-NDE of motor* a-Peak
v-RMS
a-RMS
Temp
Impact Looseness Friction (bearing) Overheating