Description

The Bently Nevada 990-10-70-01-00 is a two-wire, loop-powered vibration transmitter intended primarily for original equipment manufacturers (OEMs) of centrifugal air compressors, small pumps, motors, or fans. This industrial-grade unit conditions dynamic inputs from a 3300 NSv proximity probe and its matching extension cable, translating raw displacement into a proportional 4 to 20 mA industry-standard loop output. The hardware features a 0 to 10 mils peak-to-peak ($0-250 \mu\text{m}$ pp) full-scale vibration range configured for a 7.0-meter system length layout. Equipped with a built-in Proximitor sensor, non-interacting zero and span adjustments, and a specialized Not OK/Signal Defeat safety circuit, it delivers continuous vibration trending directly to machinery control systems and PLCs.

Features

• Equipped with an integrated Proximitor sensor requiring no external conditioning unit.
• Features a non-isolated PROX OUT coaxial connector providing direct dynamic vibration and gap voltage output for machinery diagnostics.
• Built-in non-interacting zero and span potentiometers for accurate field loop calibration.
• Integrated Test Input pin enables swift loop verification utilizing an external function generator.
• Designed with a Not OK/Signal Defeat circuit to prevent false machinery alarms from loose connections or faulty hardware.
• Features a potted construction method providing resistance within high humidity (up to 100% condensing) operating environments.

Applications

• Continuous peak-to-peak vibration trending on centrifugal air compressors.
• Localized overall vibration tracking loops for small industrial pumps, motors, or fans.
• Direct integration of dynamic non-contacting probe metrics into PLC-based control infrastructure.

Ordering Information Break Down

The model code 990-10-70-01-00 represents a pre-configured combination of four specific ordering options:

Technical Specifications

Installation Guidelines

• Securely mount the transmitter chassis onto standard industrial infrastructure via the pre-installed 35 mm DIN rail clips.
• Terminate the external supply leads to terminal blocks E1 and E2, ensuring input loop potential remains within the required +12 to +35 Vdc operational boundaries.
• Route the matching 7.0-meter extension cable from the 3300 NSv probe directly into the integrated coaxial port, avoiding excessive thread engagement limits to mitigate terminal binding risks.
• Isolate all interconnecting communication loop paths from adjacent high-voltage primary motor power lines to minimize potential electromagnetic noise coupling.
• For safety diagnostics using grounded, AC-powered test equipment, interface via a 122115-01 Test Adapter to maintain isolation and protect loop signaling path integrity.