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Description：

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).

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

Specification：

Frequently asked questions

Q1: What is the Bently Nevada 990-05-70-03-01 Vibration Transmitter?

A1: It is an industrial vibration transmitter used for continuous vibration monitoring and signal output in rotating machinery protection systems.

Q2: What is the 990-05-70-03-01 full-scale measurement range of this model?

A2: The 990-05-70-03-01 full-scale option “05” corresponds to 0–5 mils peak-to-peak (0–125 μm peak-to-peak).

Q3: What is the 990-05-70-03-01 system length of this transmitter?

A3: The 990-05-70-03-01 system length option “70” corresponds to 7.0 meters (23.0 feet).

Q4: What is the 990-05-70-03-01 maximum loop resistance?

A4: The 990-05-70-03-01 maximum loop resistance is 1,000 Ω, including cable resistance at 35 VDC.

Q5: What is the 990-05-70-03-01 current limiting specification?

A5: The 990-05-70-03-01 current limiting value is typically 23 mA.

Product Applications

Oil & Gas: Bearing vibration monitoring for small and medium-sized compressors, turbines, and pumps in refineries and natural gas processing plants.

Power Generation: Condition monitoring of cooling water circulation pumps, auxiliary fans, and auxiliary equipment in turbine generator sets at power plants.

Petrochemical: Condition monitoring and fault early warning for various high-speed rotating machinery in chemical processes.

Water Treatment and General Industries: Industrial facilities relying on critical pumping systems and large ventilation equipment.