BENTLY 176449-09 3500 System Module

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          • Bently Nevada 176449-09 — 3500/70M Reciprocating Compressor Impulse Velocity Monitor

            A 4-channel monitor card from the Bently Nevada 3500 machinery-protection system, purpose-built for reciprocating-compressor crankcase and crosshead vibration monitoring. It accepts seismic (accelerometer / Velomitor) transducer inputs, conditions the signal, and drives programmable alarms for machinery protection.

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            Key Technical Specifications

            表格

            Item	Specification
            Manufacturer	Bently Nevada (Baker Hughes)
            Catalog number	176449-09
            Monitor type	3500/70M Recip Impulse Velocity Monitor
            Channels	4 (configured in pairs — up to 2 measurement functions at once)
            Inputs	1–4 seismic transducer signals (accelerometer / Velomitor)
            Input impedance	10 kΩ acceleration input; > 1 MΩ velocity input
            Transducer supply	−22 V DC min.; 40 mA max. (foldback-protected)
            Measurement functions	Impulse Acceleration, Acceleration 2, Recip Velocity, Low-Frequency Recip Velocity
            Impulse-accel sensitivity	0.51 – 11.72 mV/(m/s²) (5 – 115 mV/g)
            Velocity sensitivity	3.54 – 22.64 mV/(mm/s) (90 – 575 mV/in/s)
            Measurement accuracy	±0.33 % of full-scale typical; ±1 % max. (excl. filters)
            High-pass corner	3 – 3000 Hz (peak); 10 – 3000 Hz (RMS)
            Low-pass corner	30 – 30,000 Hz (peak); 40 – 30,000 Hz (RMS)
            Static values returned	Direct bias, 1X/2X amplitude and phase, user crank-angle bands
            Alarms	Alert on any static value; Danger on up to 2 values; setpoints 0–100 % FS
            Alarm delays	Alert 1–60 s; Danger 0.1 s min. or 1–60 s
            Front buffered outputs	1 coax per channel, short-circuit protected, 550 Ω
            Recorder outputs	4–20 mA per channel, 600 Ω max. load, <100 ms update
            Power consumption	7.7 W nominal
            Operating temperature	−30 … +65 °C
            Storage temperature	−40 … +85 °C
            Humidity	95 % non-condensing
            Dimensions (H×W×D)	241.3 × 24.4 × 241.8 mm (main board)
            Weight	0.91 kg
            Rack space	1 full-height front slot + 1 rear I/O slot
            Software required	3500/01 Rack Configuration v5.2+, System 1 v6.90+
            Firmware	v4.21 or later
            Approvals	CSA/NRTL/C Class I Div 2 / Zone 2; ATEX/IECEx; ABS marine; DNV-GL; CE; RoHS; FCC Part 15

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            Advantages & Features

            • Purpose-built for reciprocating compressors — monitors crankcase and crosshead vibration that standard rotating-machinery monitors cannot resolve.
            • Four measurement functions on one card — impulse acceleration, acceleration 2, reciprocating velocity and low-frequency reciprocating velocity, configured in channel pairs.
            • Crank-angle band analysis — up to 6 user-defined angle bands (1° resolution) for peak/RMS acceleration, isolating faults to specific compressor events.
            • 1X/2X vector analysis — amplitude and phase at running-speed harmonics for imbalance, misalignment and resonance detection.
            • Wide, selectable filters — 4-pole high/low-pass with 80 dB/decade roll-off, tunable per measurement type.
            • Front buffered outputs — each channel has a coax test point for oscilloscope / data-logger connection during commissioning.
            • 4–20 mA recorder outputs — feed trend data to plant DCS / recorders.
            • TMR / safety-ready — works in Bently Nevada's reciprocating-compressor protection package with voting logic.
            • Hazardous-area approvals — Class I Div 2 / Zone 2 with optional internal barriers for Div 1 IS transducer circuits.
            • Marine certified — ABS and DNV-GL approvals for offshore and marine compressor packages.

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            Typical Applications

            • Reciprocating compressor crankcase and crosshead vibration monitoring
            • Detection of valve leakage, ring wear, loose cylinders and liquid slugging
            • High-speed reciprocating compressors in oil & gas, petrochemical and gas-gathering plants
            • Pipeline compressor stations and gas-lift / injection service
            • Refinery and hydrogen-recycle reciprocating machines
            • Offshore platform and FPSO compressor packages
            • Any Bently Nevada 3500 rack needing dedicated reciprocating-machine vibration protection

The structure and details of the product：

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