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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

Q1: What is the Bently Nevada 991-25-50-01-01 Thrust Transmitter used for?

A: The Bently Nevada 991-25-50-01-01 Thrust Transmitter is used to monitor axial shaft position (thrust position) in rotating machinery. 

Q2: What is the power supply requirement of the 991-25-50-01-01?

A: The 991-25-50-01-01 transmitter operates with a power supply of +12 to +35 VDC, providing flexibility for integration with various industrial monitoring and control systems.

Q3: What is the current limiting specification of the 991-25-50-01-01 transmitter?

A: The 991-25-50-01-01 features current limiting of 23 mA typical, helping protect the output circuitry and connected equipment.

Q4: What is the 991-25-50-01-01 minimum target size required for accurate measurement?

A: The 991-25-50-01-01 transmitter requires a minimum target size of 9.5 mm (0.375 inches) to ensure reliable signal detection and accurate shaft position monitoring.

Product Applications 

Oil and Gas Plants and Refineries: Used to monitor bearing wear and axial movement in large centrifugal compressors, gas turbines, and high-pressure water injection pumps, preventing severe collisions between the rotor and stator.

Chemical and Fertilizer Plants: Applied to extruders, large fans, and process compressors, providing intrinsic safety monitoring in harsh, flammable, and explosive chemical gas environments.

Thermal and Hydropower Plants: Monitors the axial thrust of steam turbine generator sets and feedwater pumps, serving as a key data source for plant-level Equipment Health Management (PHM) and DCS control systems.

Iron and Metallurgical Plants: Used for continuous condition monitoring of core power equipment such as blast furnace blowers and blast furnace gas residual pressure power generation (TRT) units.