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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 system length options).

The transmitter conditions the signal into appropriate peak-to-peak vibration amplitude engineering units, and providesthis value as a proportional 4 to 20 mA industry-standardsignal as the input to the control system where machineryprotection alarming and logic occurs.1

Frequently Asked Questions

Q1: What is the Bently Nevada 990-04-50-03-00 2-Wire Vibration Transmitter used for?

A1: The Bently Nevada 990-04-50-03-00 2-Wire Vibration Transmitter is used to convert shaft vibration measurements into a standard 4–20 mA output signal for continuous machinery monitoring, protection, and integration with PLC, DCS, and SCADA systems.

Q2: What is the frequency response of the 990-04-50-03-00 transmitter?

A2: The 990-04-50-03-00 transmitter has a frequency response of 5 Hz to 6,000 Hz (+0, -3 dB), enabling accurate vibration monitoring across a wide range of machinery operating frequencies.

Q3: What is the 990-04-50-03-00 minimum target size required?

A3: The 990-04-50-03-00 transmitter requires a minimum target size of 9.5 mm (0.375 inch) in diameter to ensure reliable signal detection and accurate vibration measurement.

Q4: What is the 990-04-50-03-00 typical current limiting value?

A4: The 990-04-50-03-00 transmitter features typical current limiting of 23 mA, helping protect the output loop and connected equipment during abnormal operating conditions.

Product Applications

Oil and Gas (Refining Units): Monitor shaft vibration of large centrifugal air compressors and reciprocating compressors.

Power Industry (Thermal Power Plants): Real-time monitoring of the operating status of steam turbine units, small and medium-sized water pumps, generator sets, and cooling fans.

Steel and Heavy Industry: Monitor bearing displacement and vibration of critical rotating equipment such as large blowers and rolling mills to prevent equipment failure.

Water Treatment and Municipal Engineering: Monitor high-power water pump units in urban water supply networks.