Product Introduction
When axial thrust failures threaten turbine or compressor uptime, the Bently Nevada 991-06-50-03-CN Probe Vibration Transmitter delivers reliable condition monitoring. This industrial automation module, manufactured in the U.S.A., converts proximity probe signals into a 4-20 mA output for real-time thrust position measurement. Designed for DIN rail mounting, the 991-06-50-03-CN accepts one non-contacting 3300 NSv probe and provides a fully scalable current loop for 0.6-0-0.6 mm or 25-0-25 mil ranges. Its Not OK/Signal Defeat feature ensures safety by driving the output below 3.6 mA within 100 µs upon fault detection, a critical advantage in failure-mode analysis.
Technical Specifications
| Parameter |
Value |
| Full-scale Option |
-06: 0.6-0-0.6 mm |
| System Length |
-50: 5.0 meters (16.4 feet) |
| Mounting |
03: DIN clips and screws |
| Output Signal |
4-20 mA (2-wire) |
| Power Requirement |
+12 to +35 Vdc at transmitter terminal |
| Linear Range |
0.25 to 1.65 mm (Prox Out) |
| Loop Accuracy |
±1.5% typical (over full scale at 250 Ω) |
| 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 lbm) |
The 991-06-50-03-CN provides non-interacting zero and span adjustments, allowing easy calibration without interrupting the loop. Its environmental limits ensure reliable operation in harsh industrial environments.
Installation & Setup Guidance
Mount the Bently Nevada 991-06-50-03-CN transmitter on a standard DIN rail using the included DIN clips and screws. Connect one non-contacting 3300 NSv proximity probe and its extension cable to the input. For 4-20 mA wiring, use a two-wire configuration with a loop resistance not exceeding 1,000 Ω at 35 Vdc. Apply +12 to +35 Vdc at the transmitter terminals—polarity must be observed. After installation, adjust zero and span using the non-interacting trimmers to match the full-scale range (0.6-0-0.6 mm). Verify the output by simulating a test signal; accuracy should be within ±1.5% across a 250 Ω load.
Maintenance & Reliability
Routine inspection of the Bently Nevada 991-06-50-03-CN focuses on the probe gap and cable condition. Check the DIN clip tightness annually. The transmitter's Not OK/Signal Defeat circuit automatically reduces output to less than 3.6 mA within 100 µs of a fault, protecting downstream equipment. The wide temperature range (-35°C to +85°C) and robust enclosure minimize drift. For maximum reliability, ensure the loop power remains within +12 to +35 Vdc; current limiting at 23 mA prevents damage during short circuits.
Compatibility & Integration
The 991-06-50-03-CN is designed specifically for use with the Bently Nevada 3300 NSv proximity probe system. It integrates directly into 4-20 mA control loops for PLCs, DCS, or standalone monitors. The axial (thrust) measurement capability makes it ideal for turbine and compressor applications. No additional communication protocols are required—the analog output feeds directly into any standard analog input module.
Selection Guide & Purchasing Advice
Before ordering the Bently Nevada 991-06-50-03-CN, verify your system length requirement (5.0 meters standard) and mounting preference. Ensure your power supply provides +12 to +35 Vdc at the transmitter terminals. For optimal performance, use only genuine Bently Nevada 3300 NSv probes and cables. PLC Source PRO stocks this module with fast shipping. Contact the team at ubest101.myshopify.com for volume pricing or technical support.