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Description
Overview
Essential details：990-10-XX-01-05 165353-01 990 Vibration Transmitter
The 990 Vibration Transmitter is intended primarily for theoriginal equipment manufacturers (OEMs) of centrifugal aircompressors or small pumps, motors, or fans who prefer toprovide a simple 4 to 20 mA proportional vibration signal asthe input to their machinery control system.
The transmitter is a two-wire, loop-powered device thataccepts input from our 3300 Nsv proximity probe and itsmatching extension cable (available in 5 m and 7 m systemlength options).
The transmitter conditions the signal into appropriate peak-to-peak vibration amplitude engineering units, and providesthis value as a proportional 4 to 20 mA industry-standardsignal as the input to the control system where machineryprotection alarming and logic occurst.
The 990 transmitter provides the following notable features:”Integrated Proximitor Sensor requires no external unit
。Non-isolated “PRoX OuT” and “CoM” terminals plus acoaxial connector to provide a dynamic vibration andgap voltage signal output for diagnostics..
Non-interacting zero and span potentiometers under事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 orfalse alarms due to a faulty proximity probe or looseconnection.
Choice of DlN-rail clips or bulkhead mounting screwsas standard options simplifies mounting.
990-04-70-01-00
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990-10-XX-01-05 165353-01 990 Vibration Transmitter
Product Description
t Vibration transmitters have many limitationswhen compared to a continuous vibrationmonitoring system. They are a practicalsolution in some applications for measuringgeneral vibration levels and are a valuable toolfor overall vibration trending. However, theyprovide limited capability for machinerydiagnostics using the vibration signal and donot capture dynamic vibration signals (used fordiagnostics)in the event of a vibration alarm.While the transmitter is capable of peakvibration alarming and non-Ok checking, the4-20 mA signal cannot be used to determinethe phase of vibration,and monitor functionssuch as gap alarms, phase alarms, Timed OKchannel defeat, Danger Bypass, and TripMultiply cannot be used.in addition,PLCsattached to the vibration transmitter can onlyprovide peak-to-peak trending data and arenot suitable for plant-wide diagnostic systemssuch as System l or Rule Paks.
+The 990 Vibration Transmitter’s “Prox Out’coaxial connector provides a non-isolateddynamic transducer signal for machinerydiagnostics.You can connect this signaldirectly to battery-powered or isolated testequipment to diagnose machinery problems.However, since the “PROX OuT” signal is notisolated from the 4 to 20 mA loop signal, aninterface is available (and stronglyrecommended)for signal isolation. The990/99l Test Adapter conditions the 990Transmitter’s “PROX OUT” signal for use with acpowered test equipment. it also inverts andisolates the 990’s transducer siqnal, making itsuitable for equipment such as oscilloscopesand analyzers, and preserving industry-standard conventions for signal polarity.Westronglyrecommend the use of this testadapter for all applications to maintain
