Description
Overview
The Bently Nevada 990‑05‑70‑03‑05 vibration transmitter is a compact, self‑contained monitoring device designed to convert proximity probe signals into a standard 4–20 mA output for machinery protection and condition monitoring. As part of the 990 Series, it integrates an internal Proximitor‑type driver, eliminating the need for external signal‑conditioning hardware and simplifying installation in both new and retrofit applications.
Functional Characteristics
This transmitter provides dynamic vibration and gap voltage outputs through a coaxial connector and dedicated terminal points, enabling simultaneous use for trending, diagnostics, and control‑system input. Zero and span adjustments are accessible beneath the product label, allowing precise loop calibration without interaction between settings.
A built‑in test input enables rapid verification of loop integrity using a function generator. The Not‑OK/Signal‑Defeat circuitry suppresses false alarms caused by probe faults, cable issues, or intermittent connections, ensuring stable operation in critical machinery environments.
The unit supports both DIN‑rail and bulkhead mounting, offering flexibility for panel layouts and field installations.
Technical Specifications
| Parameter |
Specification |
| Model / Part Number |
990‑05‑70‑03‑05 |
| Product Type |
Vibration Transmitter |
| Series |
990 Series |
| Output Signal |
4–20 mA proportional to vibration |
| Dynamic Signal Output |
Coaxial connector (vibration + gap) |
| Terminals |
PROX OUT, COM |
| Calibration Adjustments |
Zero and span potentiometers |
| Test Input |
Yes (loop verification) |
| Fault Handling |
Not‑OK/Signal‑Defeat circuit |
| Mounting Options |
DIN‑rail clip and bulkhead screws |
| Operating Temperature |
–35 °C to +85 °C (typical transmitter rating) |
| Weight |
0.46 kg |
| Dimensions |
1.8 × 1.6 × 123 cm |
| Origin |
USA |
| Condition |
Brand New |
| Availability |
In Stock |
| HS Code |
8537101190 |
| System Compatibility |
TSI systems and general vibration monitoring |
Application Areas
-
Turbine supervisory instrumentation
-
Pumps, compressors, and fans
-
Gearboxes and rotating machinery
-
Industrial process equipment requiring 4–20 mA vibration feedback
-
Remote or distributed monitoring architectures
FAQ
Q: Does this transmitter require an external Proximitor? No. The 990‑05‑70‑03‑05 includes an integrated Proximitor‑type driver.
Q: Can I access dynamic vibration signals? Yes. A coaxial connector provides raw vibration and gap voltage signals for diagnostics.
Q: What mounting hardware is included? Both DIN‑rail clips and bulkhead screws are supplied.
Q: How does the Not‑OK/Signal‑Defeat function help? It prevents false alarms caused by probe or cable faults, improving system reliability.
