BENTLY NEVADA 990-05-50-01-05 Vibration Transmitter

Features

• Integrated Proximitor Sensor requires no external unit
• Non-isolated “PROX OUT" and "COM" terminals plus a coaxial connector to provide a dynamic vibration and gap voltage signal output for diagnostics
• Non-interacting zero and span potentiometers under the Transmitter label supports loop adjustment
• Test Input pin for quick verification of loop signal output, using a function generator as the input
• A Power-up Inhibit circuit eliminates signal errors due to line voltage transients
• A Not OK/Signal Defeat circuit prevents high outputs or false alarms due to a faulty proximity probe or loose connection
• Choice of DIN-rail clips or bulkhead mounting screws as standard options simplifies mounting
• Potted construction for high humidity (up to 100% condensing) environments
• Compatibility with 3300 NSv proximity probe allows transducer installation in small areas with minimal clearance, typical of centrifugal air compressors

The GE / Bently Nevada 990 Vibration Transmitter is intended primarily for the original equipment manufacturers (OEMs) of centrifugal air compressors or small pumps, motors, or fans who prefer to provide a simple 4 to 20 mA proportional vibration signal as the input to their machinery control system.

The 990 vibration transmitter is a 2-wire, loop-powered device that accepts input from GE Bently Nevada’s 3300 NSv proximity probes and a matching extension cable (available in 5 m and 7 m system length options). The transmitter conditions the signal into appropriate peak-to-peak vibration amplitude engineering units, and provides this value as a proportional 4 to 20 mA industry-standard signal as the input to the control system where machinery protection alarming and logic occurs.

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