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The 99l Thrust 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 axial displacement(thrust) signal as the input to their machinery control system.The transmitter is a 2-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 intoappropriate engineering units proportional to the shaft's axialpositionl, and provides it as a 4 to 20 mA industry-standardsignal for input to the control system where machineryprotection alarming and logic occurs2.

Frequently Asked Questions

Q : What is the Bently Nevada 991 Transmitter?

A : It is a 2-wire, loop-powered device that transforms proximity probe signals into a 4-20 mA linear output.

Q : What does the code "25" in my part number mean?

A : It defines a full-scale measurement range of 25-0-25 mils (equivalent to ±0.64 mm).

Q : Can I use this transmitter to measure radial vibration?

A : No. Vibration measurement requires the Bently Nevada 990 Vibration Transmitter, not the 991.

Q : What is the standard operating temperature range for the 991 housing?

A : The transmitter block functions reliably within an ambient temperature environment of -35°C to +85°C.

Product Applications

Oil and gas chemical plants: Used to monitor compressor units in large oil refining units, natural gas liquefaction and transmission stations.

Power plants (thermal/nuclear): Used for monitoring the axial displacement of industrial steam turbines, large feedwater pumps, and forced and induced draft fans.

Air separation plants and steel mills: Used to monitor large centrifugal air compressors (oxygen production and supply systems).

Machine tool and large automobile manufacturing plants: Used for monitoring the displacement and vibration of high-precision, high-speed rotating spindles.