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Description The 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 transmitter is a two-wire, loop-powered device that accepts input from our 3300 NSv proximity probe and its matching extension cable (available in 5 m and 7 m system length options). The transmitter conditions the signal into appropriate peakto-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.1 The 990 transmitter provides the following notable features: l Integrated Proximitor Sensor requires no external unit l Non-isolated PROX OUT and COM terminals plus a coaxial connector to provide a dynamic vibration and gap voltage signal output for diagnostics.2 l Non-interacting zero and span potentiometers under the Transmitter label supports loop adjustment. l Test Input pin for quick verification of loop signal output, using a function generator as the input. l A Not OK/Signal Defeat circuit prevents high outputs or false alarms due to a faulty proximity probe or loose connection. l Choice of DIN-rail clips or bulkhead mounting screws as standard options simplifies mounting.