Description
Manufacturer : Bently Nevada
Product No. : 990-04-50-01-00
Product Type : 990 Vibration Transmitter
Made in U.S.A
Full-scale Option : 0 4 - 0-4 mils pp (0-100 μm pp)
System Length Option : 5 0 - 5.0 metres (16.4 feet)
Mounting Option : 0 1 - 35 mm DIN rail clips
Agency Approval Option : 0 0 - Not required
Input : Accepts 1 non-contacting 3300 NSv Proximity Probe and extension cable.
Power : Requires +12 to +35 Vdc input at the transmitter terminal.
Maximum Loop Resistance : 1,000 Ω including cable at 35 Vdc.
Current Limiting : 23 mA typical.
Shipping Weight : 2 Kg
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 peakto-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 occurs†.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 underthe 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 DIN-rail clips or bulkhead mounting screwsas standard options simplifies mounting. • Potted construction for high humidity (upto 100% condensing) environments.Compatibility with 3300 NSv proximityprobe allows transducer installation insmall areas with minimal clearance,typical of centrifugal air compressors.
Notes † 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 1 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. The990/991 Test Adapter conditions the 990Transmitter's "PROX OUT" signal for use with acpowered test equipment. It also inverts andisolates the 990's transducer signal, making itsuitable for equipment such as oscilloscopesand analyzers, and preserving industrystandard conventions for signal polarity. Westrongly recommend the use of this testadapter for all applications to maintainisolation between test equipment and the loopsignal, and ensure that the installationmaintains machinery protection integrity.
The company focuses on DCS, PLC, robot, large servo four systems
The main products are various modules/cards, controllers, touch screens, servo drivers
Company advantage: Supply imported original products, professional production of spare parts
One year warranty, fast delivery time, complete supply !！！
① 24 hours email response (12 hours);
② For shipment outside Asia, please contact the seller.
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