Bently Nevada 991 Thrust Transmitter

The Bently Nevada 991 Thrust Transmitter delivers a precise 4 to 20 mA output signal proportional to shaft thrust position, making it ideal for smaller, non-critical rotating machinery. It is commonly used on centrifugal air compressors equipped with fluid-film thrust bearings and can accurately measure up to 1.2 mm (50 mils) of total axial thrust movement.

This 2-wire, loop-powered transmitter works with Bently Nevada 3300 NSv proximity probes and matching 5 m or 7 m extension cables. It converts axial shaft position into clear engineering units and transmits a reliable 4 to 20 mA signal to machinery control and protection systems for effective monitoring, alarm management, and operational safety.

QInstrument is a leading supplier of Bently Nevada 991 Thrust Transmitter in UK and Ireland (EU), offering competitive prices and fast worldwide shipping across Turkey, Saudi Arabia, Oman, Nigeria, Indonesia, Malaysia, Vietnam, Mexico, Brazil, Argentina, and Colombia. Buy Bently Nevada Proximity Sensors from one of the UK’s leading suppliers of industrial automation and instrumentation equipment.

Features of Bently Nevada 991 Thrust Transmitter

• Integrated Proximitor Sensor with no external unit needed
• PROX OUT and COM terminals with coaxial connector for vibration and gap voltage diagnostics
• Non-interacting zero and span adjustments for easy loop calibration
• Test Input pin for quick loop verification with a DC voltage source
• Power-up Inhibit circuit prevents transient signal errors
• Not OK/Signal Defeat circuit avoids false alarms from faulty probes or loose connections
• DIN-rail or bulkhead mounting options for easy installation
• Potted construction for high-humidity environments up to 100% condensing
• Compatible with 3300 NSv probes for tight, low-clearance installations

Technical Specifications of Bently Nevada 991 Thrust Transmitter

• Input: 1 × 3300 NSv proximity probe + extension cable
• Output: 4–20 mA proportional to thrust
• Power supply: +12 Vdc to +35 Vdc, loop‑powered
• Accuracy: ±1.5 % full scale
• Linear range: 0.25–1.65 mm (10–65 mils)
• Probe out impedance: ~10 kΩ
• Incremental scale factor: ~7.87 mV/µm
• Minimum target size: ~9.5 mm diameter
• Not OK response: <3.6 mA, restores in ~0.1 s
• Loop resistance: Max 1 000 Ω
• Mounting: DIN‑rail or bulkhead
• Operating temp: –35 °C to +85 °C
• Storage temp: –51 °C to +100 °C
• Certifications: CSA/NRTL/C, ATEX/IECEx, CE compliant

Proximity Sensors Part Number & Configuration Guide

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

991-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 Full-scale Option, System Length, Mounting & Approvals.

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

Applications

The Bently Nevada 991 Thrust Transmitter is commonly used in monitoring industrial rotating equipment, including:

• Centrifugal air compressors
• Small pumps, motors, and fans
• OEM machinery control systems
• Skid-mounted equipment packages
• Applications requiring a simple 4 to 20 mA vibration signal output

Downloadable

Bently Nevada 991 Thrust Transmitter Product Specifications

Why Choose QInstrument?

At QInstrument, we’re more than just an industrial instrument supplier, we’re your trusted partner for industrial automation, instrumentation, control systems, and test & measurement solutions.

Here’s why companies across the United Kingdom (UK) and Ireland (EU) choose us for industrial products and technical support:

• Test & Measurement Instruments You Can Trust: We supply high-quality test and measurement instruments from leading global brands, including industrial sensors, multimeters, oscilloscopes, accelerometers, proximity probes, calibrators, and advanced diagnostic tools for condition monitoring, maintenance, and industrial applications.
• Industrial Automation & Control Solutions: Our product portfolio includes PLC systems, SCADA solutions, transmitters, analyzers, process control instruments, vibration monitoring systems, and industrial networking solutions designed to improve operational efficiency, accuracy, and reliability.
• Fast, Reliable Worldwide Delivery: We proudly support customers across Turkey, Saudi Arabia, Oman, Nigeria, Indonesia, Malaysia, Vietnam, Mexico, Brazil, Argentina, and Colombia with reliable products, technical expertise, responsive customer service, and efficient global delivery solutions.

We Ship Worldwide

At QInstrument, we supply industrial automation, test and measurement instruments, control systems, and sensors across the United Kingdom (UK) and Ireland (EU), offering fast and reliable worldwide delivery. Through strong global logistics partnerships, we ensure efficient shipping and professional support for customers across Europe, South America, Africa, Southeast Asia, and the Middle East.

🡆 Europe (United Kingdom, Turkey)
🡆 South America (Brazil, Argentina, Colombia)
🡆 Africa (Nigeria)
🡆 Southeast Asia (Indonesia, Malaysia, Vietnam)
🡆 Middle East (Saudi Arabia, Oman)