990 Vibration Transmitter Introduction

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 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.

 990 Vibration Transmitter Features and benefits

1.Integrated Proximitor Sensor requires no external unit

2. Non-isolated "PROX OUT" and "COM" terminals plus acoaxial connector to provide a dynamic vibration and gap voltage signal output for diagnostics.

3.Non-interacting zero and span potentiometers under the Transmitter label supports loop adjustment.

4.Test Input pin for quick verification of loop signal output, using a function generator as the input.

5. A Not OK/Signal Defeat circuit prevents high outputs or false alarms due to a faulty proximity probe or loose connection.

6. Choice of DIN-rail clips or bulkhead mounting screws as standard options simplifies mounting.

7. Potted construction for high humidity (up to 100% condensing) environments. Compatibility with 3300 NSv proximity probe allows transducer installation in small     areas with minimal clearance, typical of centrifugal air compressors.

Isolation between test equipment and the loop signal, and ensure that the installation maintains machinery protection integrity