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Bently Nevada 991 Thrust Transmitter
The Bently Nevada 991 Thrust Transmitter is a 2-wire, loop-powered device that measures shaft axial position and delivers a proportional 4 to 20 mA output signal. Designed for smaller, non-critical machinery such as centrifugal air compressors with fluid-film thrust bearings, it accurately monitors up to 1.2 mm (50 mils) of thrust movement for reliable machinery protection and control system integration.
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Categories: Proximity Sensor
Description
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.
QTech Safety is a leading supplier of Bently Nevada 991 Thrust Transmitter in Ireland, offering competitive prices and fast worldwide shipping across United Kingdom (UK), Germany, France, Italy, Spain, United States USA, Canada, Mexico, and Western Australia (Perth). Buy Bently Nevada Proximity Sensors from one of Ireland’s most trusted industrial safety equipment suppliers.
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
Why Choose QTech Safety?
At QTech Safety, we’re more than just a safety supplier we’re your trusted partner in workplace protection and compliance.
Here’s why companies across UK and Ireland (EU) choose us for safety products and training:
- Comprehensive Range of Safety Equipment:
From gas detection and PPE to industrial safety tools, we offer one of the widest selections of trusted brands all at competitive Irish market prices. - Test & Measurement Instruments You Can Trust:
We supply a wide range of test and measurement instruments from the most leading and trusted brands, including industrial sensors, multimeters, oscilloscopes, accelerometers, proximity sensors, and other advanced measurement tools to support accurate diagnostics, condition monitoring, calibration, and maintenance applications. - Expert Health & Safety Training:
We provide professional health and safety training programmes designed to help your workforce stay compliant and confident on the job. - Fast, Reliable Delivery Worldwide:
Whether you’re in Texas United States or Perth Western Australia, our fast delivery service ensures you get your safety equipment quickly and efficiently. - Trusted by European Businesses:
We’re proud to support industries across Europe (UK) with certified safety solutions, expert advice, and responsive customer service.
We Ship Worldwide
At QTech Safety, we supply industrial sensors and instrumentation across Ireland, offering fast and reliable worldwide delivery. Through strong global logistics partnerships, we ensure efficient shipping and professional support for customers in Europe, North America, and Australia.
🡆 Europe (United Kingdom, Ireland, Germany, France, Italy, Spain, and the rest of European Union)
🡆 Australia (Western Australia WA, Queensland QLD, and New South Wales NSW)
🡆 North America (United States, Canada, Mexico)
