991-25-50-03-05 Vibration Transmitter

Overview

Place of Origin:	USA
Brand Name:	Bently Nevada
Model Number:	991-25-50-03-05
Minimum Order Quantity:	1
Packaging Details:	Original new Factory Sealed
Delivery Time:	5-7 days
Payment Terms:	T/T
Supply Ability:	In stock

Quick Detail

Description:

The Bently Nevada 991-25-50-03-05 is a high-performance, loop-powered Vibration Transmitter engineered for reliable, continuous machinery condition monitoring in demanding industrial environments. This robust device is specifically designed to convert raw vibration signals from industry-standard proximity probes into a highly stable, standardized 4-20 mA output signal. This output is directly proportional to the measured vibration displacement, enabling seamless integration with Distributed Control Systems (DCS), Programmable Logic Controllers (PLC), and plant-wide monitoring networks. The vibration transmitter facilitates real-time equipment protection and is a cornerstone for data-driven predictive maintenance strategies, making it an indispensable tool for safeguarding critical rotating assets where operational safety and efficiency are paramount.

This particular model, the 991-25-50-03-05, is distinguished by its specialized full-scale option of 25-0-25 mils, allowing it to monitor both positive and negative displacement—a critical feature for applications such as axial thrust position monitoring in turbines and compressors. The device features a compact and robust housing measuring 10.9x7.2x6cm and weighing only 0.42kg, designed for flexible installation using both DIN clips and screws. Its 2-wire loop-powered operation eliminates the need for a separate external power supply, dramatically simplifying wiring, reducing installation complexity, and lowering overall system costs. The integrated system length of 5.0 meters (16.4 feet) provides ready-to-use convenience.

Applications

The 991-25-50-03-05 is ideally deployed for continuous protection monitoring of industrial machinery where bi-directional displacement measurement is critical. Its unique full-scale option of 25-0-25 mils makes it perfect for monitoring axial thrust position in steam turbines, gas turbines, and large centrifugal compressors in power generation and oil & gas sectors. By providing a stable 4-20 mA signal proportional to shaft position, it enables control systems to prevent catastrophic rotor-stator contact, safeguarding high-value assets from severe damage and unplanned downtime.

This vibration transmitter is exceptionally suited for integration into machinery protection systems within harsh and classified environments. Its comprehensive agency approvals (CSA, ATEX, ABS) allow for direct installation in hazardous areas such as offshore platforms, petrochemical plants, and marine vessels. The 2-wire loop-powered design and compact form factor make it ideal for retrofitting into existing control panels with limited space and wiring complexity in pump houses, compressor stations, and other non-climate-controlled industrial enclosures, providing robust condition monitoring without additional signal conditioners.

Serving as a fundamental component for cost-effective predictive maintenance programs, this transmitter enables long-term health trend analysis for a wide range of rotating equipment, including fans, blowers, and motors. Its high accuracy and immunity to electrical interference ensure reliable data collection for tracking machinery degradation over time. This capability is crucial for industries like water treatment, chemical processing, and general manufacturing, where monitoring overall vibration and specific displacement parameters helps schedule maintenance proactively, optimize performance, and prevent unexpected failures.

Specifications

Competitive Advantage

1.Specialized Bi-Directional Measurement Capability

The 991-25-50-03-05 offers a distinct competitive edge with its full-scale option of 25-0-25 mils. Unlike standard transmitters that measure vibration magnitude only, this model provides precise monitoring of both positive and negative displacement. This is essential for critical applications like axial thrust position monitoring, giving users unparalleled insight into machine condition and enabling proactive protection against thrust bearing failure in turbines and compressors, a feature not commonly found in general-purpose vibration transmitters.

2.Certified Robustness for Hazardous and Demanding Environments

This transmitter stands out with its comprehensive suite of international agency approvals, including CSA Division 2, ATEX Zone 0, Zone 2, and ABS maritime certification. This pre-certification allows for straightforward deployment in explosive atmospheres and demanding locations like offshore platforms and chemical plants, reducing project compliance time and risk. Coupled with its wide operating temperature range (-56°C to +84°C) and rugged construction, it delivers reliable performance where other transmitters cannot, ensuring continuity of safety-critical monitoring.

3.Simplified Installation and Uncompromising Signal Integrity

The combination of a true 2-wire loop-powered design and flexible mounting options (DIN clips and screws) drastically reduces installation time and cost by eliminating separate power wiring. Despite this simplicity, it does not sacrifice performance. With an exceptionally low supply sensitivity (<0.05%/Volt), the transmitter guarantees that the 4-20 mA output signal remains accurate and stable, immune to power supply fluctuations and industrial electrical noise. This provides users with reliable, high-integrity data for both protection and predictive diagnostics from a device that is quick and easy to install.