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
The 990 transmitter provides the following notable 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 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
Environmental Limits ：
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Attribute
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Details
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Transmitter Operating Temperature
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-35°C to +85°C (-31°F to +185°F)
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Transmitter Storage Temperature
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-52°C to +100°C (-62°F to +212°F)
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Probe Operating Temperature
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-52°C to +177°C (-62°F to +351°F)
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Probe Storage Temperature
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-52°C to +177°C (-62°F to +351°F)
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Relative Humidity
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100% condensing, non-submerged, with protection of coaxial connectors
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Mechanical：
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Attribute
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Details
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Transducer Tip Material
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Polyphenylene Sulfide (PPS)
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Transducer Case Material
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AISI 303 or 304 Stainless Steel (SST)
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Probe Cable
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75Ω coaxial, fluoroethylene propylene (FEP) insulated
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Cable Armor (Optional)
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Flexible AISI 302 SST with optional FEP outer jacket
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Tensile Strength
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222 N (50 lbf) probe case to probe lead, maximum
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Transmitter Weight
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0.43 kg (0.9 lbm)
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Total System Weight
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0.82 kg (1.8 lbm) typical
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