product description 

Product details

990 Vibration Transmitter

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 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:

l 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.

Product Parameter

Model Number: 991-25-70-01-00

Origin:USA

Bently series of products