Bently Nevada 990-05-70-02-05 Vibration Transmitter

Description

The 990-05-70-02-05 is a 2-wire, loop-powered vibration transmitter developed for original equipment manufacturers (OEMs) of rotating machinery. It integrates the functional capabilities of a proximity probe driver (proximitor) and signal conditioning electronics into a single, compact field unit. The transmitter tracks dynamic radial vibration or shaft elongation by interfacing directly with a non-contacting proximity transducer system, translating raw displacement data into a proportional 4-20 mA analog current output. This continuous current loop interfaces directly into distributed control systems (DCS), programmable logic controllers (PLCs), or SCADA networks without the addition of separate monitor racks or dedicated proximitor modules, making it a space-efficient selection for critical machinery safety loops.

Features

• Integrated driver and signal conditioning circuitry to reduce instrumentation layout footprints.
• 2-wire loop-powered configuration providing a 4-20 mA DC signal representation of vibration levels.
• Accessible frontal BNC jack delivering a buffered dynamic raw voltage output (Prox Out) scaled at 200 mV/mil.
• Specialized tuning optimized for direct interface with the 3300 NSv proximity transducer system.
• Reliable design constructed to maintain precision under extreme temperature variants and high-vibration stresses.

Applications

• Centrifugal air compressor radial vibration and shaft movement tracking.
• High-speed industrial pump and motor mechanical protection.
• Cooling tower fan and blower structural safety loops.
• OEM rotating asset integrated control panel configurations.

Ordering Information

Technical Specifications

Connections/Interfaces

Installation Guidelines

• Mechanical Bulkhead Installation: Mount the transmitter module securely onto a flat panel surface inside an enclosure using the bulkhead screw holes provided.
• Transducer Setup: Install and gap the 3300 NSv proximity probe relative to the target material according to project engineering guidelines. Connect the 7.0m extension cable between the probe and the transmitter coaxial input port.
• Moisture Protection: Wrap the probe-to-extension cable coaxial connections with self-fusing silicone tape to prevent moisture infiltration and grounding errors.
• Electrical Loop Wiring: Connect the 4-20 mA signal wires from the receiver instrument to the transmitter terminal block while maintaining correct (+/-) polarity. Do not exceed the maximum supply limit of 35 Vdc.
• Noise Avoidance: Route transmitter loop wiring and probe extension cables isolated from variable frequency drive (VFD) outputs, motor supply wires, or high-voltage AC electrical lines.
• Loop Verification: Energize the loop circuit and verify a standard 4 mA baseline output when the monitored shaft is completely static.

Compliance and Certifications

• CSA Certified Zone 0 / Zone 2
• ATEX Certified Zone 0 / Zone 2
• ABS Maritime Type Certification