Product Overview
Upgrading your rotating machinery thrust monitoring system? The Bently Nevada 991-06-70-03-00 Probe Vibration Transmitter offers a direct replacement for older axial vibration transmitters, delivering reliable 4-20 mA output for critical thrust measurements. Designed for DIN rail mounting, this transmitter accepts a single non-contacting 3300 NSv proximity probe and provides accurate linear output over a 0.6-0-0.6 mm full-scale range. The 991-06-70-03-00 is built for harsh industrial environments with an operating temperature range of -35°C to +85°C and storage from -51°C to +100°C.
Technical Specifications
The Bently Nevada 991-06-70-03-00 delivers precise axial monitoring with these key parameters:
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Power Supply: +12 to +35 Vdc input at transmitter terminal
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Output Signal: 4-20 mAdc over specified full-scale range in 2-wire configuration
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Accuracy: Within ±1.5% over full scale range (typical) from TEST signal input to voltage across 250 Ω loop resistance
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Maximum Loop Resistance: 1,000 Ω including cable at 35 Vdc
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Current Limiting: 23 mA typical
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Zero and Span: Non-interacting external adjustments
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Signal Defeat: Output goes to <3.6 mA within 100 µs after a Not OK condition; restores within 0.1 seconds after removal
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Weight: 0.43 kg (0.9 lbm)
Industry Applications
The 991-06-70-03-00 is specifically designed for axial thrust monitoring in large rotating machinery such as steam turbines, compressors, and pumps. Its 4-20 mA output integrates directly into PLC, DCS, or vibration monitoring systems for real-time protection and diagnostics. For replacement projects, the transmitter’s linear range of 0.25 to 1.65 mm (prox out) supports both 0.6-0-0.6 mm and 25-0-25 mils current loop ranges, making it compatible with existing probe systems.
Installation & Setup
Mount the Bently Nevada 991-06-70-03-00 on a standard DIN rail using the included DIN clips and screws (option 03). Connect one 3300 NSv proximity probe and extension cable to the input. Wire the 4-20 mA output to your monitoring system with a loop supply of +12 to +35 Vdc. Adjust zero and span using the non-interacting external trimmers. Ensure the loop resistance does not exceed 1,000 Ω at 35 Vdc to maintain accuracy. The signal defeat feature automatically indicates a fault by pulling output below 3.6 mA.
Maintenance & Reliability
With no moving parts and a rugged enclosure rated for -35°C to +85°C operating temperature, the 991-06-70-03-00 requires minimal maintenance. Periodic inspection of wiring connections and probe condition is recommended. The transmitter’s current limiting and fast signal defeat response enhance system reliability by preventing false readings during transient faults. Choose this model for long service life in continuous duty applications.
Selection Guide
When ordering the Bently Nevada 991-06-70-03-00, verify the full-scale option (-06 for 0.6-0-0.6 mm), system length (-70 for 7.0 meters/23.0 feet), and mounting option (03 DIN clips and screws). Ensure your probe system matches the 3300 NSv series. PLC Source PRO, available through ubest101, stocks this exact configuration for fast delivery. For assistance with compatibility or custom requirements, contact our technical team.