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產(chǎn)品詳情
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 2-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 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 occurs1.
The 990 transmitter provides the following notable features:
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Integrated Proximitor* Sensor requires no external unit
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Non-isolated “PROX OUT" and "COM" terminals plus a coaxial connector to provide a dynamic vibration and gap voltage signal output for diagnostics2.
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Non-interacting zero and span potentiometers under the Transmitter label supports loop adjustment.
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Test Input pin for quick verification of loop signal output, using a function generator as the input.
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A Power-up Inhibit circuit eliminates signal errors due to line voltage transients.
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A Not OK/Signal Defeat circuit prevents high outputs or false alarms due to a faulty proximity probe or loose connection.
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Choice of DIN-rail clips or bulkhead mounting screws as standard options simplifies mounting.
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Potted construction for high humidity (up to 100% condensing) environments.
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Compatibility with 3300 NSv proximity probe allows transducer installation in small areas with minimal clearance, typical of centrifugal air compressors.
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