Product Introduction
When thrust position monitoring is critical for machine protection, the Bently Nevada 991-06-70-01-00 Probe Vibration Transmitter provides reliable axial displacement measurement. This DIN-rail mounted transmitter accepts a non-contacting 3300 NSv proximity probe and outputs a 4 to 20 mAdc signal over its specified full-scale range. Designed for axial vibration monitoring, the 991-06-70-01-00 is a key component for steam turbines, compressors, and other rotating machinery.
Technical Specifications Breakdown
The Bently Nevada 991-06-70-01-00 offers precise performance with the following key specifications derived from its design:
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Power Supply: Requires +12 to +35 Vdc input at the transmitter terminal.
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Output Signal: 4 to 20 mAdc over specified full-scale range in 2-wire configuration.
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Loop Accuracy: Within ±1.5% over specified full scale range (typical).
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Maximum Loop Resistance: 1,000 Ω including cable at 35 Vdc.
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Operating Temperature: -35°C to +85°C (-31°F to +185°F).
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Weight: 0.43 kg (0.9 lbm).
| Parameter |
Value |
| Full-scale Option |
-06: 0.6-0-0.6 mm |
| System Length |
-70: 7.0 meters (23.0 feet) |
| Mounting |
DIN rail (35 mm clips) |
| Linear Range |
0.25 to 1.65 mm for Prox Out |
| Current Limiting |
23 mA typical |
Industry Applications
The 991-06-70-01-00 excels in axial thrust monitoring applications. For instance, in steam turbines, the transmitter continuously measures shaft position, sending a 4-20 mA signal to a control system. When an anomaly occurs, the Not OK/Signal Defeat function forces the output below 3.6 mA within 100 µs, triggering alarms and preventing damage. Similarly, in large compressors, the ±1.5% accuracy ensures early detection of thrust bearing wear.
Installation & Setup Guidance
Mount the Bently Nevada 991-06-70-01-00 on a 35 mm DIN rail using the included clips. Connect the 3300 NSv proximity probe and extension cable to the input. Power the transmitter with +12 to +35 Vdc. Use non-interacting external adjustments for zero and span calibration. The 4-20 mA output connects in a 2-wire configuration. Ensure loop resistance does not exceed 1,000 Ω at 35 Vdc.
Maintenance & Reliability
Operating temperature range of -35°C to +85°C allows use in harsh environments. The Not OK/Signal Defeat automatically resets within 0.1 seconds after fault removal, minimizing downtime. Current limiting at 23 mA protects the loop. No periodic calibration is required under normal conditions, but verify zero and span annually for critical applications.
Selection Guide & Purchasing Advice
When ordering, confirm full-scale option (-06: 0.6-0-0.6 mm) and system length (-70: 7.0 m). For stock availability and detailed support, contact ubest101. Ensure your existing system accepts 4-20 mA input and provides +12 to +35 Vdc power.