The Bently Nevada 990-05-70-02-05 Vibration Transmitter is a specialized vibration transmitter primarily designed for original equipment manufacturers (OEMs) who produce centrifugal air compressors or small pumps, motors, or fans. These manufacturers often seek a straightforward method to provide a 4-20 mA signal that is directly proportional to the level of vibration in their machinery. This signal can then be easily integrated into the machinery's control system as an input for monitoring and protection purposes. This particular 990-05-70-02-05 transmitter operates as a two-wire, loop-powered device, meaning it receives its power through the same two wires it uses to transmit the signal. It is specifically designed to accept input from a Bently Nevada 3300 NSv proximity probe, along with its matching extension cable, which are available in system lengths of 5 meters and 7 meters.

The Bently Nevada 990-05-70-02-05 takes the signal from the proximity probe and conditions it to represent the peak-to-peak vibration amplitude in appropriate engineering units. This conditioned value is then output as a proportional 4-20 mA signal, which is an industry standard for control systems. This signal can be used by the control system to trigger alarms or implement protective logic based on the detected vibration levels, thereby safeguarding the machinery from potential damage. A notable feature of this 990 vibration transmitter is its integrated Proximitor sensor. This eliminates the need for a separate, external Proximitor unit, simplifying the overall system design and installation.

Additionally, the Bently Nevada 990-05-70-02-05 Vibration Transmitter provides non-isolated “PROX OUT” and “COM” terminals, as well as a coaxial connector. These outputs allow for the connection of diagnostic equipment to analyze the dynamic vibration and gap voltage signals, aiding in troubleshooting and in-depth machinery assessment.