Bently Nevada 3300/46 Ramp Differential Expansion Monitor

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• Conduct visual inspections of the monitor and probes at regular intervals. Look for signs of

  physical damage, such as cracks in the monitor casing, loose connectors, or bent probes. Physical

  damage can affect the performance of the monitor and the accuracy of the measurements.

• Check the status indicators on the monitor, if available. These indicators can provide information

  about the normal operation of the device or alert you to potential problems. For example, a

  flashing red light may indicate an internal fault or a measurement error.

• Inspect the cables connecting the probes to the monitor for any signs of wear, such as frayed

  insulation or exposed wires. Damaged cables should be replaced immediately to prevent signal

  loss and potential electrical hazards.

Many large machines requiring differential expansion monitoring lack a convenient location for 

mounting the large proximity probes needed for this critical measurement, and extremely large 

machines may even demand a monitoring range exceeding the linear range of the largest available 

transducers; the 3300/46 Ramp Differential Expansion Monitor addresses these challenges with an 

alternate measurement technique, enabling expanded monitoring ranges from standard transducers 

and proving highly useful when conventional collar-based methods are unfeasible. 3300/46 uses two 

proximity probes to monitor ramp surfaces on the rotor for one channel of differential expansion—

this ramp surface setup not only allows smaller transducers to cover larger ranges but also offers 

greater flexibility in selecting transducer mounting locations—while the LCD of 3300/46 displays both 

the magnitude and direction of differential expansion, and 3300/46 is equipped with four alarm 

setpoints (two over and two under alarms).