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Bently Nevada 3500/50E Tachometer Module

Bently Nevada 3500/50E Tachometer Module

Bently Nevada 3500/50E Tachometer Module 、Bently Nevada 3500/50M Tachometer Module,

The PIMs support input voltages ranging from +21 Vdc to +32 Vdc. The most common  power source comes from external DIN rail mounted AC/DC +24 Vdc output power

supplies. The Instrument Common(IS) and Protective Earth connections for the  system are made at the utility side of the PIM. External redundant power supplies are  recommended for the system.

Remove and insert a single Power Input Module without disrupting system operation, as  long as another PIM remains installed and connected to its input power source.



Part No:

Product Name:Tachometer Module

Accepts two transducer signals

Input signal range +10.0 V to -24.0 V

Input impedance:

20 k Ω (standard)

40 k Ω (TMR)

7.15 k Ω (Internal Barrier)

Power consumption: 5.8 watts, typical

Front panel LEDs: OK, TX/RX, Bypass

Output impedance 550 Ω



Bently Nevada 3500/50E was a privately held US corporation between 1961 and 2002, during which time it pioneered the eddy-current proximity probe, a sensor that revolutionized the measurement of vibration in high-speed turbomachinery by allowing the direct observation of the rotating shaft. The company also performed significant research in the field of rotordynamics, furthering knowledge of machinery malfunctions such as shaft cracks and fluid-induced instabilities. Its research also helped refine the equations used to describe vibratory behavior in rotordynamic systems.


The 3500TMR configuration performs the monitor voting function by selecting the install function of the MONITOR option. In this way, the TMR TDI continuously compares the output of the three redundant monitors. If the TMR TDI detects that the output of one monitor is not equal to the output of the other two monitors (within a percentage of the configuration), it issues an error indication to the monitor.

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