Due to the band filter range of the filters of the software, data will not be collected in the low frequency vibration range (1,2,3 x RPM) as well as the very high frequencies. If you are collecting data in the filter 1 or filter 2 range, you can get away with using a 500 mv sensor due to the upper frequency levels of the sensor. If you are using filter 3 or especially filter 4, you MUST use a 100 mv transducer to collect the data due to the upper range of the sensor. A 500 mv upper frequency range will not go out to 10 KHz needed to collect a filter 3 reading. Filter 4 is measuring out to 2.4 M cpm and is obviously way outside that operating range of a 500 mv sensor.
We have had great success identifying bearing defect frequencies down to 3 RPMs. It is very possible with the correct settings. Identifying the frequency range where the bearings are indicating a problem is the key. For example, have identified 11 RPM kiln trunion bearings using filter 3 and a 100 mv sensor a year in advance of stage 4 failure.
Filter ranges are as follows:
Filter 1 = 300 - 6K cpm Filter 2 = 3K - 60K cpm
Filter 3 = 30K - 600K cpm Filter 4 = 300K - 2.4 M cpm