Product Introduction
The Bently Nevada 991-25-70-03-CN Probe Vibration Transmitter delivers precise axial thrust monitoring for critical rotating machinery. Designed for DIN rail mounting, this unit converts proximity probe signals into a 4-20 mA output, enabling seamless integration with control systems. Its robust construction ensures reliable operation in harsh industrial environments.
Technical Specifications Breakdown
Key parameters of the Bently Nevada 991-25-70-03-CN include:
| Specification |
Value |
| Full-scale Option |
25-0-25 mils |
| System Length Option |
7.0 m (23.0 ft) |
| Mounting Option |
DIN clips and screws |
| Output Signal |
4-20 mA |
| Power Supply |
+12 to +35 Vdc |
| Accuracy |
±1.5% typical |
| Operating Temperature |
-35°C to +85°C |
| Weight |
0.43 kg |
The Bently Nevada 991-25-70-03-CN features non-interacting zero and span adjustments, a 23 mA current limit, and a Not OK/Signal Defeat function that forces output below 3.6 mA within 100 µs upon fault detection. This rapid response prevents erroneous readings and protects downstream equipment.
Industry Applications
Ideal for axial thrust monitoring in steam turbines, compressors, and large pumps, the Bently Nevada 991-25-70-03-CN ensures early detection of shaft displacement. In a typical installation, the transmitter works with a 3300 NSv proximity probe to provide real-time data for predictive maintenance programs. Its ±1.5% loop accuracy supports precise condition monitoring even in noisy environments.
Installation & Setup Guidance
Mount the Bently Nevada 991-25-70-03-CN on a DIN rail using the supplied clips and screws. Connect the non-contacting 3300 NSv probe and extension cable to the input. Wire the 4-20 mA loop in a 2-wire configuration, ensuring the loop resistance does not exceed 1,000 Ω at 35 Vdc. Apply +12 to +35 Vdc at the transmitter terminals. Adjust zero and span externally using the non-interacting potentiometers. Verify output scaling matches the 25-0-25 mils full-scale range.
Maintenance & Reliability
The Bently Nevada 991-25-70-03-CN operates reliably from -35°C to +85°C and stores from -51°C to +100°C. Its sealed enclosure resists moisture and dust. Periodically inspect wiring connections and verify output linearity. The current limiting circuit (23 mA typical) protects against loop faults. The rapid Not OK response minimizes downtime by alerting operators instantly to probe or cable failures.
Selection Guide & Purchasing Advice
When ordering, confirm the full-scale option (-25), system length (-70), mounting option (03), and agency approval (-CN). The Bently Nevada 991-25-70-03-CN is a direct replacement for older thrust transmitters in similar applications. For genuine parts and competitive pricing, consider ubest101 as a trusted supplier of industrial automation spares.