August 2016Maintenance, Test & Measurement, Calibration
Vibration and temperature are the most common parameters used for machinery protection. Of these, temperature has been used longer, probably because it was available first and was better understood than vibration analysis. However, it is now stated that vibration it the better measurement over temperature because it gives an earlier warning and more information as the vibration signal contains many frequencies and many amplitudes, each pertaining to some moving part of the machine.
The latest units available in the RC range now combine these two parameters and provide protection of critical plant from high temperature and high vibration levels. The unit consists of a 2-wire 4-20 mA output to monitor vibration levels and a DC voltage output that has a 10 mV per °C directly proportional to the measured temperature and not an inferred measurement of the vibration.
Different velocity (mm/sec) ranges, process connection and electrical connections are available. The standard unit, which covers most applications, would have a vibration range of 25 mm/sec RMS, an 8 mm stud process connector and a 3 m cable connection. The unit’s environmental rating is IP 67 and it has a case material of stainless steel with a top cable entry.
The unit can also be supplied with a local IP67 control box to give on-plant indication of both temperature and vibration. Both process variables have their own alarms along with 4-20 mA retransmission and local 24 VDC supply to provide the transducer power. The local control box requires a 90-260 VAC or DC power supply and gives temperature and vibration indication with a high and trip alarm facility.
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