The 991 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 991-25-50-01-05?

A: The Bently Nevada 991-25-50-01-05 is a displacement transducer system used to measure shaft displacement in rotating machinery.

Q2: What is the full-scale range of the Bently Nevada 991-25-50-01-05?

A: The full-scale range is ±25 mils (25-0-25 mils).

Q3: What is the system length of the Bently Nevada 991-25-50-01-05?

A: The Bently Nevada 991-25-50-01-05 has a system length of 5.0 meters (16.4 feet).

Q4: How is the Bently Nevada 991-25-50-01-05 mounted?

A: The Bently Nevada 991-25-50-01-05 is mounted using 35 mm DIN-rail clips.

Product Applications

Electric power industry: Widely used in steam turbines, generators and large water pumps of thermal power plants, nuclear power plants and hydropower stations to monitor axial movement to prevent friction and collision between moving and stationary parts.

Petroleum and natural gas: Used in compressors and turbine-driven units of oil extraction and gas transmission pipelines to ensure safe operation under extreme conditions.

Petrochemical industry: Essential in centrifuges, large fans and key pump equipment of refineries and chemical plants.

Metallurgy and mining: Applied in blast furnaces, large ventilators and other key rotating assets of steel mills.

Core functional features

Non-contact measurement: When used in conjunction with the Bently Nevada 3300 NSv eddy current probe, it enables high-precision non-contact monitoring.

Adaptability to harsh environments: Using a potting process, it can operate reliably in environments with up to 100% relative humidity (condensation).

Real-time diagnosis: Provides an un-isolated PROX OUT coaxial connector that can be directly connected to an oscilloscope or data acquisition device for dynamic vibration analysis and fault diagnosis.

Safety protection: Built-in Not OK/Signal Defeat circuit to prevent false alarms caused by probe damage or loose connections.

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