Product Overview
The Bently Nevada 991-25-70-01-05 is a precision Probe Vibration Transmitter designed for industrial axial thrust monitoring. This 991-25-70-01-05 model replaces older thrust transmitters with enhanced accuracy and environmental robustness, ideal for upgrading turbine and compressor protection systems. As part of Bently Nevada's trusted series, this module ensures reliable 4-20 mA loop output for seamless integration into existing control systems.
Technical Specifications
| Parameter |
Value |
| Full-Scale Range |
25-0-25 mils (0.6-0-0.6 mm) |
| System Length |
7.0 meters (23.0 feet) |
| Mounting |
35 mm DIN-rail clips |
| Output Signal |
4-20 mAdc over full-scale range |
| Power Supply |
+12 to +35 Vdc at transmitter terminal |
| Accuracy |
±1.5% over full-scale range (typical) |
| Maximum Loop Resistance |
1,000 Ω (including cable at 35 Vdc) |
| Current Limiting |
23 mA typical |
| Operating Temperature |
-35°C to +85°C (-31°F to +185°F) |
| Storage Temperature |
-51°C to +100°C (-60°F to +212°F) |
| Weight |
0.43 kg (0.9 lb) |
The 991-25-70-01-05 accepts one non-contacting 3300 NSv proximity probe and extension cable, converting axial displacement to a linear 4-20 mA signal. Non-interacting zero and span adjustments simplify calibration.
Installation & Setup Guidance
Mount the Bently Nevada 991-25-70-01-05 on a standard 35 mm DIN rail using the included clips. Ensure the probe tip is positioned correctly for axial thrust measurement per the system length option of 7.0 meters. Power the transmitter with +12 to +35 Vdc, observing polarity. Connect the 4-20 mA loop to a 250 Ω resistance (typical) for accuracy verification. The transmitter’s Not OK function forces output below 3.6 mA within 100 µs upon fault, restoring within 0.1 seconds.
Maintenance & Reliability
This transmitter operates reliably from -35°C to +85°C, making it suitable for harsh environments. Periodic inspection of cable integrity and connector cleanliness ensures consistent performance. The sealed enclosure and rugged DIN-rail mount reduce vibration-induced failures. When upgrading, the Bently Nevada 991-25-70-01-05 offers extended lifecycle support compared to earlier models.
Selection Guide & Purchasing Advice
When ordering, verify the full-scale option (-25 for 25-0-25 mils) and agency approval option (-05 for CSA/ATEX/ABS maritime). Ensure the total system length (including probe cable) matches application requirements. For reliable supply of this 991-25-70-01-05 module, contact PLC Source PRO (formerly at ubest101) for fast fulfillment and technical support. Always confirm environmental limits match your site conditions.