Bently 991-01-XX-01-00 288865-01 Displacement Transmitter - Image 1

Bently 991-01-XX-01-00 288865-01 Displacement Transmitter - Image 2

Bently 991-01-XX-01-00 288865-01 Displacement Transmitter

Product Overview
The Bently 991-01-XX-01-00 288865-01 is a two-wire loop-powered displacement transmitter designed for industrial automation control applications. It converts simple shaft displacement signals into proportional 4-20 mA industrial standard signals, enabling integration with control systems for protection, alarming, and logic control. This transmitter is specifically tailored for OEMs of centrifugal air compressors, small water pumps, motors, or fans, providing a reliable and cost-effective solution for monitoring axial displacement in rotating machinery.

Category: Bently

Description

Technical Specifications

Input Signal: Accepts signals from Bently 3300 NSv proximity probes with matched extension cables (5 m or 7 m system length options).
Output Signal: Provides a proportional 4-20 mA signal representing shaft displacement in engineering units.
Power Supply: Two-wire loop-powered design (12-35 Vdc input).
Accuracy: ±1.5% of full-scale range, ensuring precise measurement and reliable performance.
Environmental Rating: Sealed structure suitable for high-humidity environments (up to 100% condensing).
Mounting Options: DIN rail clip or bulkhead mounting screws for simplified installation.
Agency Approvals: Optional certifications include CSA Division 2, ATEX Zone 0, ATEX Zone 2, and ABS maritime certification, meeting diverse industrial safety standards.

Functional Features

Integrated Proximitor Unit: Eliminates the need for external devices, reducing system complexity and cost.
Diagnostic Outputs: Non-isolated “PROX OUT” and “COM” terminals, plus a coaxial connector, provide dynamic vibration and gap voltage signals for fault diagnosis.
Zero and Span Adjustment: Non-interactive zero and span potentiometers support loop calibration without external tools, ensuring accurate signal output.
Test Input Pins: Enable rapid verification of loop signal output using a function generator as input, facilitating quick system checks.
Power-Up Inhibition Circuit: Prevents signal errors caused by line voltage transients during startup, enhancing system stability.
Abnormal/Signal Failure Detection: Protects against high output or false alarms due to probe faults or loose connections, ensuring reliable operation.

Application Scenarios
The Bently 991-01-XX-01-00 288865-01 is ideally suited for:

Centrifugal Air Compressors: Monitors axial displacement to prevent mechanical failures and ensure efficient operation.
Small Water Pumps: Provides real-time displacement monitoring for early detection of pump wear or misalignment.
Motors and Fans: Detects abnormal shaft movement, enabling predictive maintenance and reducing downtime.
Original Equipment Manufacturers (OEMs): Offers a simple, cost-effective solution for integrating displacement monitoring into mechanical control systems.

Key Advantages

High Reliability: Robust design ensures long-term stability and minimal maintenance requirements.
Easy Installation: Compact size and flexible mounting options simplify integration into existing systems.
Enhanced Diagnostics: Diagnostic outputs facilitate quick troubleshooting and reduce mean time to repair.
Cost-Effective: Reduces the need for complex monitoring systems by providing a straightforward, scalable solution.
Global Compliance: Meets international safety and environmental standards, ensuring compatibility with diverse applications.

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