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The 990 Vibration Transmitter is intended primarily for the original equipment manufacturers (OEMs) of centrifugal air compressors or small pumps, motors, or fans who prefer to provide a simple 4 to 20 mA proportional vibration signal as the input to their machinery control system.

The transmitter is a two-wire, loop-powered device that accepts input from our 3300 NSv proximity probe and its matching 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 provides this value as a proportional 4 to 20 mA industry-standard signal as the input to the control system where machinery protection alarming and logic occurs†.

Frequently Asked Questions

Q1: What is the Bently Nevada 990-04-50-02-01 990 Vibration Transmitter used for?

A1: The Bently Nevada 990-04-50-02-01 990 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 maximum loop resistance supported by the 990-04-50-02-01 transmitter?

A2: The 990-04-50-02-01 transmitter supports a maximum loop resistance of 1,000 Ω, including cable resistance, when operating with a 35 VDC power supply.

Q3: What is the 990-04-50-02-01 typical current limiting value?

A3: The 990-04-50-02-01 transmitter features typical current limiting of 23 mA, helping protect the output loop during abnormal operating conditions.

Q4: What does Full-scale Option (04) indicate?

A4: Full-scale Option (04) specifies a measurement range of 0–4 mils peak-to-peak (0–100 μm peak-to-peak), making it suitable for precision shaft vibration monitoring.

Product Applications

Oil and Gas Industry: Centrifugal Air Compressors

Water Treatment and Process Industries: Small and Medium-Sized Industrial Water Pumps

Power and Machinery Manufacturing: Small and Medium-Sized Fans and Drive Motors