Bently Nevada 991 Thrust Transmitter

Bently Nevada 991 Thrust Transmitter

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The Bently Nevada 991 Thrust Transmitter is a compact, loop-powered device designed to provide a 4–20 mA output signal proportional to shaft axial (thrust) position. It is specifically intended for use on smaller, non-critical machinery, with primary applications in centrifugal air compressors equipped with fluid-film thrust bearings.

The transmitter is capable of measuring up to 1.2 mm (50 mils) of total thrust movement, enabling accurate monitoring of axial displacement. It operates as a 2-wire, loop-powered device and accepts input from Bently Nevada 3300 NSv proximity probes with matching extension cables (available in 5 m and 7 m system lengths).

The 991 transmitter conditions the input signal into appropriate engineering units and outputs a standard 4–20 mA signal for integration with control systems, where machinery protection, alarming, and logic functions are performed. An integrated Proximitor sensor eliminates the need for an external signal conditioning unit.

Features of Bently Nevada 991 Thrust Transmitter

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• 4–20 mA Thrust Position Output – Proportional to shaft axial displacement

• Integrated Proximitor Sensor – No external signal conditioning required

• 2-Wire Loop-Powered Design – Simplifies installation and wiring

• Compatible with 3300 NSv Proximity Probe – Ideal for compact installations

• Non-Interacting Zero and Span Adjustments – External potentiometers for loop calibration

• PROX OUT Diagnostic Output – Provides vibration and gap voltage signal for monitoring

• Test Input Pin – Allows quick verification using a variable DC voltage source

• Power-up Inhibit Circuit – Prevents signal errors during startup

• Not OK / Signal Defeat Circuit – Prevents false alarms due to probe faults or wiring issues

• Flexible Mounting Options – DIN rail clips or bulkhead mounting screws

• Potted Construction – Suitable for high humidity (up to 100% condensing) environments

Technical Specifications of Bently Nevada 991 Thrust Transmitter

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General

• Application: Thrust (axial position) measurement on small machinery

• Maximum Measurement Range: 1.2 mm (50 mils) total thrust movement

• Input: 1 non-contacting 3300 NSv proximity probe with extension cable

• System Length Options: 5 m and 7 m

Electrical

• Power Supply: +12 to +35 Vdc

• Output Signal: 4–20 mA (2-wire configuration)

• Loop Accuracy: ±1.5% of full-scale range

• Maximum Loop Resistance: 1,000 Ω (including cable at 35 Vdc)

• Current Limiting: 23 mA typical

Signal & Measurement

• Linear Range (PROX OUT): 0.25 mm to 1.65 mm

• Typical Loop Range: 0.6–0–0.6 mm (25–0–25 mils)

• Minimum Target Size: 9.5 mm diameter

PROX OUT (Diagnostic Output)

• Output Impedance: 10 kΩ (calibrated for 10 MΩ load)

• Scale Factor:7.87 mV/μm (200 mV/mil) ±6.5% typical
  

• Maximum Cable Length: 3 meters

Installation & Compatibility

• Non-Hazardous / Zone 2 / Div 2:
  Up to 13 km (8 miles) between transmitter and receiving device

• Intrinsically Safe Areas:
  Up to 68 meters (225 ft.) between transmitter and receiving device

Mechanical & Installation

• Mounting Options: DIN rail or bulkhead

• Construction: Potted for high humidity environments

• Compatibility: Designed for 3300 NSv proximity probe systems

Applications of Bently Nevada 991 Thrust Transmitter

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The Bently Nevada 991 Thrust Transmitter is used in machinery where axial position monitoring is required, particularly:

• Centrifugal Air Compressors

• Small Rotating Equipment with Fluid-Film Thrust Bearings

Typical Use Cases

• Thrust position monitoring

• Axial displacement measurement

• Integration with PLC/DCS systems for protection and control

Part Number of Bently Nevada 991 Thrust Transmitter

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Standard (Example) Part Number

991-06-50-01-00

This is a reference configuration for the Bently Nevada 991 Thrust Transmitter. It represents one commonly supplied setup and helps customers understand how the part number is structured.

Configurable Part Number Format

990-XX-XX-XX-XX

Each X / XX in the part number indicates a selectable option that can be customized based on your application requirements such as Approvals & Length.

Important: Final part number depends on the exact configuration needed for your machinery, environment, and monitoring system.

Why Buy Bently Nevada 991 Thrust Transmitter from ShopAED?

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• FREE delivery anywhere in UAE.

• Best online prices : Best online prices for Bently Nevada 991 Thrust Transmitter.

• Bulk Discount : ShopAED offers exclusive bulk pricing on Bently Nevada vibration monitoring and proximity sensor systems, making it ideal for large-scale industrial operations such as oil & gas plants, power generation facilities, petrochemical industries, and heavy manufacturing units.

• Fast Shipping : We ensure fast and reliable delivery of Bently Nevada products, minimizing downtime for your critical machinery. Our streamlined logistics network guarantees timely dispatch and accurate order fulfillment across the UAE and international markets.

• Lead Time : Standard lead time for Bently Nevada products is 3 to 4 weeks, depending on model and configuration. We coordinate closely with suppliers to ensure transparent timelines and timely delivery for your project requirements..

• Local presence : Locally registered business in Dubai UAE.

ShopAED is Supplier of Bently Nevada 991 Thrust Transmitter in Dubai (UAE), Saudi Arabia (KSA), Bahrain, Kuwait, Oman & Qatar

For over 15 years, ShopAED has been a trusted supplier of advanced Industrial and Medical Solutions, offering a comprehensive range of Test and Measuring Instruments for accurate diagnostics, calibration, and performance monitoring across industries such as oil & gas, manufacturing, and utilities, along with Automation Control Systems, Sensors, and Engine Parts to support efficient operations and maintenance, in addition, we specialize in AED Defibrillators with a complete range of AED Accessories, Battery, Pads, AED Trainers, and CPR Manikins for emergency preparedness and life-saving training, complemented by essential safety equipment including Respirators, Goggles, Helmets, Earmuffs, Single and Multi Gas Detectors to ensure reliable protection and compliance in demanding work environments.

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