The GE / Bently Nevada 3500/50 and 3500/50M Series Tachometer Module is a 2-channel module that accepts input from proximity probes or magnetic pickups to determine shaft rotative speed, rotor acceleration, rotor direction. The module compares these measurements against user-programmable alarm setpoints and generates alarms when the setpoints are violated. The 3500/50M Tachometer Module can be configured to supply conditioned Keyphasor* signals to the backplane of the 3500 rack for use by other monitors. Therefore, you don't need a separate Keyphasor module in the rack. The 3500/50M Tachometer Module has a peak hold feature that stores the highest speed, the highest reverse speed, or the number of reverse rotations that the machine has reached. You can reset the peak values.
