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The Bently Nevada 3300XL 5/8mm 991-01-XX-01-00 288865-01 Thrust Transmitter is designed for use in machinery protection systems, particularly for monitoring the thrust position in smaller, non-critical machinery. This transmitter is primarily utilized on centrifugal air compressors equipped with fluid-film thrust bearings. Here's a detailed overview based on the provided sources:
Key Specifications
Functionality: Provides a 4-20 mA signal proportional to thrust position, making it suitable for machinery protection alarming and logic within control systems.
Compatibility: Designed to work with Bently Nevada's 3300 NSv proximity probes and matching extension cables, available in 5 and 7-meter system length options.
Power Requirements: Operates on a +12 to +35 Vdc input at the transmitter terminal.
Signal Output: Outputs a 4 to 20 mAdc signal over the specified full-scale range in a 2-wire configuration.
Accuracy: Offers loop accuracy within ±1.5% over the specified full-scale range.
Maximum Loop Resistance: Supports a maximum loop resistance of 1,000 Ω including cable at 35 Vdc.
Current Limiting: Typically limits current to 23 mA.
Adjustments: Allows for non-interacting external zero and span adjustments.
Not OK/Signal Defeat: The signal output will drop below 3.6 mA within 100 microseconds upon detecting a Not OK condition, restoring within 0.1 seconds once the condition is resolved.
Additional Features
Proximitor Sensor Output: Compatible with ungrounded, portable test equipment. For grounded, AC-powered test equipment, a 122115-01 Test Adapter is recommended for signal isolation.
Output Impedance: The Prox Out has a 10 kΩ output impedance calibrated for a 10 MΩ load.
Linear Range: Suitable for 0.25 to 1.65 mm for Prox Out, aligning with 0.6-0-0.6 mm or 25-0-25 mils current loop linear ranges.
Temperature Stability: The incremental scale factor remains within ±10% of 7.87 mV/μm from 0 °C to +70 °C.
Minimum Target Size: Requires a minimum target size of 9.5 mm diameter.
Leadwire Length: The maximum leadwire length for the Proximitor Sensor Output (BNC connector) is 3 meters.
Hazardous Area Locations: Supports non-hazardous, Zone 2 or Div 2 hazardous area locations with a maximum distance of 13 km (8 miles) between transmitter and receiving device for signal output. For intrinsically safe hazardous area locations, the maximum distance is 68 meters (225 ft.).
Accessories and Cables
Test Adapter: The Bently Nevada 990/991 Test Adapter inverts and isolates the PROX OUT signal, facilitating connections to AC-powered diagnostic equipment.
Weatherproof Housing: NEMA 4 rated housing protects transmitters from environmental hazards.
Technical Training: Offers training and consulting services for applications involving power generation, mechanical drives, and petro-chemical industries.
Extension Cables: Available for the Bently Nevada 3300 XL NSv Transducer System, supporting various system lengths.