Product Introduction
When thrust bearing failures lead to costly turbine damage, the Bently Nevada 991-06-70-03-05 Thrust Transmitter provides critical axial vibration monitoring. This 4-20 mA loop-powered transmitter accepts a 3300 NSv proximity probe and delivers precise displacement measurements. Designed for industrial automation, the 991-06-70-03-05 converts probe signals into a 4-20 mA output proportional to shaft axial position, enabling early detection of thrust bearing wear. The unit mounts on a standard DIN rail and operates from +12 to +35 Vdc, making it a reliable component for continuous monitoring in harsh environments.
Technical Specifications
The Bently Nevada 991-06-70-03-05 Thrust Transmitter is built with precision and durability. Below are key specifications derived from the product data:
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Full-Scale Option: -06 0.6-0-0.6 mm
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System Length: -70 7.0 meters (23.0 feet)
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Mounting: DIN clips and screws (Option 03)
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Agency Approvals: CSA Division 2, ATEX Zone 0, ATEX Zone 2, ABS maritime
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Power Supply: +12 to +35 Vdc input at transmitter terminal
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Output Signal: 4-20 mA (2-wire configuration)
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Linear Range: 0.25 to 1.65 mm for Prox Out; suitable for 0.6-0-0.6 mm current loop linear ranges
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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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Current Limiting: 23 mA typical
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Operating Temperature: -35°C to +85°C (-31°F to +185°F)
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Storage Temperature: -51°C to +100°C (-60°F to +212°F)
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Weight: 0.43 kg (0.9 lbm)
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Not OK/Signal Defeat: Output goes <3.6 mA within 100 µs on fault; restores within 0.1 seconds after clearance
Installation & Setup Guidance
Mount the Bently Nevada 991-06-70-03-05 Thrust Transmitter on a DIN rail using the included DIN clips and screws (Option 03). Ensure the proximity probe (3300 NSv) is correctly connected via the extension cable. The transmitter accepts one non-contacting probe. Power the unit with a +12 to +35 Vdc source at the transmitter terminal. The 4-20 mA loop connects in 2-wire configuration. Non-interacting external adjustments for zero and span allow precise calibration without disconnection. Verify the linear range matches your application: 0.25 to 1.65 mm typical for the 0.6-0-0.6 mm full-scale option.
Maintenance & Reliability
The 991-06-70-03-05 is designed for long-term reliability in demanding industrial environments. Its operating temperature range of -35°C to +85°C and storage range of -51°C to +100°C ensure stable performance in extreme conditions. Periodic inspection of the probe and cable integrity is recommended. The current limiting feature (23 mA typical) protects against overcurrent. The Not OK/Signal Defeat function rapidly indicates faults, reducing downtime. With proper maintenance, this transmitter delivers consistent axial thrust measurements for years, preventing catastrophic turbine failures.
Selection Guide & Purchasing Advice
When ordering the Bently Nevada 991-06-70-03-05, ensure the full-scale option (-06 = 0.6-0-0.6 mm) and system length (7.0 meters) match your installation. The mounting option includes DIN clips and screws. Agency approvals cover CSA Division 2, ATEX Zone 0, ATEX Zone 2, and ABS maritime. Verify compatibility with your 3300 NSv proximity probe. For reliable supply and genuine parts, contact PLC Source PRO (available at ubest101.myshopify.com) to source your 991-06-70-03-05 thrust transmitter.