The Bently Nevada 990-05-70-02-01 Vibration Transmitter is a specialized vibration transmitter engineered to provide a 4-20 mA signal that is directly proportional to the relative vibration experienced by smaller, often non-critical machinery. This particular BN 990-05-70-02-01 Transmitter is primarily intended for original equipment manufacturers (OEMs) who produce machinery such as centrifugal air compressors, small pumps, motors, or fans. These manufacturers often require a simple and reliable way to integrate a vibration signal into their machinery's control system.

The Bently Nevada 990-05-70-02-01 serves this purpose by accepting input from a Bently Nevada 3300 NSv proximity probe and its corresponding extension cable, which are available in system lengths of 5 meters and 7 meters. As a two-wire, loop-powered device, this 990-05-70-02-01 Vibration Transmitter draws its operating power from the same two wires that it uses to transmit the output signal.

The BN Vibration Transmitter's core function is to condition the signal received from the proximity probe, converting it into appropriate engineering units that represent the peak-to-peak vibration amplitude. This conditioned signal is then output as a 4-20 mA current, an industry-standard signal that can be readily interpreted by various control systems. The control system can then use this information to trigger alarms, initiate safety shutdowns, or implement other control logic based on the detected levels of machinery vibration. A key feature of this 990 vibration transmitter is the integration of the Proximitor sensor directly into the unit.