Description：

The Bently Nevada 990-04-50-02-00 990 Vibration Transmitter is designed for OEMs of centrifugal air compressors, small pumps, motors, and fans. It provides a 4 to 20 mA proportional vibration signal to machinery control systems. This two-wire, loop-powered device integrates a Proximitor sensor for proximity probe input, conditioning the signal into peak-to-peak vibration amplitude engineering units.

Key Features:

• Integrated Proximitor Sensor with no external unit required.
• Non-isolated "PROX OUT" and "COM" terminals with a coaxial connector for dynamic vibration and gap voltage signal output.
• Non-interacting zero and span potentiometers for loop adjustment.
• Test Input pin for quick verification of loop signal output.
• Not OK/Signal Defeat circuit prevents false alarms.
• Choice of DIN-rail clips or bulkhead mounting screws.
• Potted construction for high humidity environments.

Specifications:

• Input: Accepts 3300 NSv Proximity Probe and extension cable.
• Output: 4 to 20 mA signal with ±1.5% accuracy.
• Temperature Stability: ±10% from 0 °C to +70 °C.
• Frequency Response: 5 Hz to 6,000 Hz.
• Electrical Classification: CSA/NRTL/C, VDE, CE marked.
• Environmental Limits: Operating temperature -35 °C to +85 °C, storage -51 °C to +100 °C.

Mechanical Details:

• Transducer tip material: Polyphenylene sulfide (PPS).
• Transducer case material: AISI 303 or 304 Stainless Steel.
• Probe Cable: 75Ω coaxial, FEP insulated.
• Weight: Transmitter 0.43 kg, total system 0.82 kg typical.

Ordering Information: 

Suffix Code Meaning: 990-AA-BB-CC-DD

Naming Convention: 990-AA-BB-CC-DD

• AA: Full-scale Option

  • 0: 0-4 mils peak-to-peak (0-100 μm peak-to-peak)

• BB: System Length Option

  • 5: 5.0 meters (16.4 feet)

• CC: Mounting Option

  • 0: Bulkhead screws

• DD: Agency Approval Option

  • 0: Not required