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The Bently Nevada 990-04-50-02-CN is a 2-wire, loop-powered vibration transmitter designed for centrifugal air compressors, small pumps, motors, and fans. It converts 3300 NSv proximity probe signals into a 4-20 mA output with 5.0-meter system length, bulkhead mounting, and China certification.

The 990 Vibration Transmitter is intended primarily for theoriginal equipment manufacturers (OEMs) of centrifugal aircompressors or small pumps, motors, or fans who prefer toprovide a simple 4 to 20 mA proportional vibration signal asthe input to their machinery control system.

The transmitter is a two-wire, loop-powered device thataccepts input from our 3300 NSv proximity probe and itsmatching extension cable (available in 5 m and 7 m systemlength options).

Frequently Asked Questions

Q1: What is the Bently Nevada 990-04-50-02-CN?

A1: It is a vibration transmitter used to convert vibration signals from proximity probe systems into a standard 4–20 mA output for machinery condition monitoring.

Q2: What does the “04” full-scale option represent?

A2: “04” indicates a full-scale measurement range of 0–4 mils peak-to-peak (0–100 μm peak-to-peak).

Q3: What is the 990-04-50-02-CN measurement range of this transmitter?

A3: The 990-04-50-02-CN measurement range is 0–100 μm peak-to-peak.

Q4: What does the “50” system length option represent?

A4: “50” specifies a system cable length of 5.0 meters (16.4 feet).

Q5: What is the 990-04-50-02-CN output signal type?

A5: The 990-04-50-02-CN transmitter provides a standard 4–20 mA analog output signal for integration with control and monitoring systems.

Product Applications 

Oil and Gas (Petrochemicals): Used for critical shaft vibration monitoring in compressors, pumps, and generator sets in oil refineries and petrochemical plants.

Power Generation and Utilities: Used in rotating machinery such as steam turbines, water turbines, and blowers in power plants to detect vibration and ensure safe operation of the units.

Steel and Metallurgy: Used in the high-temperature and harsh environments of steel plants for real-time vibration monitoring of motors and fans.

Machine Tools and Manufacturing: Used for shaft vibration and displacement measurement in machining centers.