The Sensor Proximity Bently Nevada 991-25-50-02-05 is a two-wire, loop-powered thrust transmitter designed primarily for OEMs of centrifugal air compressors, small pumps, motors, and fans. It provides a simple 4 to 20 mA output proportional to axial displacement (thrust), making it ideal for integration into machinery control systems. This compact device accepts input from a 3300 NSv proximity probe and its matching extension cable, available in 5 m and 7 m system lengths, offering flexibility in installation.

A key advantage of the Bently 3500 Monitoring System 991-25-50-02-05 is its integrated Proximitor sensor, which eliminates the need for an external unit. It also features non-isolated “PROX OUT” and “COM” terminals, along with a coaxial connector, providing dynamic vibration and gap voltage signals for diagnostic purposes. These outputs allow users to monitor machine health without interrupting the primary 4–20 mA control signal.

The unit is designed for ease of use and reliability. The 991-25-50-02-05 Sensor Proximity Bently Nevada includes non-interacting zero and span potentiometers located under the transmitter label, facilitating straightforward loop adjustment. A test input pin enables quick verification of the loop signal output using a variable DC voltage source, simplifying maintenance and calibration procedures.

Furthermore, the Bently Nevada 991-25-50-02-05 Thrust Transmitter incorporates advanced circuitry for enhanced operational integrity. A power-up inhibit circuit prevents signal errors caused by line voltage transients, while a Not OK/Signal Defeat circuit avoids false alarms resulting from faulty probes or loose connections. These features ensure that the BENTLY NEVADA 991-25-50-02-05 delivers reliable and accurate thrust monitoring in demanding industrial environments.