Bently Nevada 3701/44 Monitoring Protection Unit

Product Description

3701/44 is the ADAPT Aeroderivative Monitor from Bently Nevada. It is a compact skid-mounted standalone machinery protection and condition monitoring unit, specially designed for aeroderivative gas turbines such as LM2500 and LM6000. It accepts signals from proximity probes, accelerometers, velocity transducers, dynamic pressure sensors and magnetic speed pickups. It integrates turbine-specific algorithms including order tracking filters, narrow-band high-order bandpass filters and combustion pulsation analysis. Dual redundant processor version is available for machinery protection. It can be installed close to the machine on skid to reduce field wiring. Configuration is done via BNMC software, and diagnostic data can be sent to System 1 for trending and fault analysis.

Technical Specifications

• Model: 3701/44
• Series: ADAPT Aeroderivative Monitor
• Dynamic sensor inputs: up to 12 channels
• Keyphasor / speed channels: 2 galvanically isolated channels
• ADC: 24-bit Sigma-Delta
• Bandwidth: 0.5 Hz ~ 40 kHz
• Signal-to-noise ratio: 110 dB
• Power supply: Dual redundant 24 VDC
• Communication: 2 independent 10/100 Base-T Ethernet ports
• Protocols: Modbus TCP, EGD
• Buffered signal output: 15-pin D-Sub, BNC/SMC adapter optional, 550 Ω output impedance
• Relays: Protection fault relay, multi-channel programmable alarm relays
• Configuration software: BNMC (Bently Nevada Monitor Configuration)
• Diagnostic platform: System 1 Evolution
• Operating temperature: -40℃ ~ +70℃
• Mounting: Skid DIN rail mounting, local installation near machine
• Certifications: CE, ATEX Zone2, RoHS
• Measurands: Shaft radial vibration, thrust displacement, casing absolute vibration, combustion dynamic pressure, speed, eccentricity

Application

1. Protection and condition monitoring for aeroderivative gas turbines: LM2500, LM6000, FT8, RB211
2. Combustion dynamic pressure pulsation monitoring and combustion instability diagnosis
3. Vibration, thrust position and casing vibration measurement, alarm and protection interlock for gas turbine and driven equipment
4. Integrated TSI monitoring for aeroderivative gas turbines on offshore platforms and skid-mounted power stations
5. High-speed gearbox and rolling bearing high-order vibration feature acquisition
6. Data transmission to DCS, SCADA and System1 for predictive maintenance

Series Models

3701/46 (Hydro Monitor), 3701/55 (ADAPT ESD Overspeed), 3701/42