3500/70-01-00 Bently Nevada Recip Impulse/Velocity Monitor Module

Product Overview

• The 3500/70-01-00 is a dedicated 4-channel monitor for reciprocating compressors.
• It forms a vital part of the Bently Nevada 3500 machinery protection system.
• This 3500/70-01-00 unit specializes in impulse acceleration and velocity measurements.
• Features precise signal conditioning for crankcase and crosshead vibration monitoring.
• The 3500/70-01-00 helps prevent catastrophic failure through programmable alarm logic.

Configuration Breakdown

• Model: 3500/70M — Recip Impulse/Velocity Monitor
• Suffix A: 01 (I/O Option) — Prox/Velom I/O Module with Internal Terminations
• Suffix B: 00 (Agency Approval) — No agency approval required (None)

Technical Specifications

• Brand: Bently Nevada / Baker Hughes
• Model: 3500/70-01-00
• Input Capacity: 4 independent channels (Proximity or Seismic)
• Logic Modes: Impulse Accel, Accel 2, Recip Velocity, Low Frequency Velocity
• Input Impedance: 10 kΩ for acceleration; >1 MΩ for velocity inputs
• Internal Power: -22 Vdc minimum; 40 mA maximum current
• Filter Quality: 4-pole high/low pass with 80 dB per decade roll-off
• Accuracy: Within ±0.33% typical; ±1% maximum (exclusive of filters)
• Output Type: 4-20 mA proportional recorder outputs per channel
• Communication: Integrated TX/RX for 3500 rack data exchange
• Temperature Range: -30°C to +65°C (-22°F to +149°F)
• Weight: 0.91 kg (2.0 lb) for main monitor module

Global PLC Spare HUB’s Insight

• The 3500/70-01-00 provides the specialized "Impulse" logic missing in general vibration monitors.
• Our review notes the 8-revolution smoothing filter as a key feature for stable static value readings.
• The 3500/70-01-00 effectively bridges the gap between raw seismic data and actionable plant maintenance info.
• Perfect for legacy system upgrades where high-reliability reciprocating protection is a priority.

Primary Equipment & Application Scenarios

• Gas Compression: Monitoring heavy-duty reciprocating compressors in midstream gas plants.
• Refinery Operations: Cylinder and frame vibration tracking for hydrogen compression units.
• Impact Detection: Identifying mechanical looseness in crosshead and connecting rod assemblies.
• Sub-synchronous Analysis: Tracking low-frequency vibration signatures during variable speed operation.

Diagnostic & Protection Capabilities

• Real-time Indicators: OK, TX/RX, and Bypass LEDs for immediate module status verification.
• Fault Rejection: "Not OK" filter triggers at 2400 Hz to prevent erroneous data from hardware faults.
• Buffered Data: Front-panel coaxial outputs for high-resolution analyzer integration.
• Custom Alarms: User-programmable Alert and Danger setpoints for tailored machinery protection.

Shipping and Purchase Terms

• Express Logistics: Worldwide expedited shipping via FedEx, UPS, and DHL.
• Dispatch Time: Most 3500/70-01-00 orders ship within 24-48 hours.
• Warranty: Fully backed by a 12-month comprehensive warranty.
• Package List: Includes one (1) 3500/70-01-00 monitor and matching I/O module.

Frequently Asked Questions (FAQ)

• Can I use Velomitor sensors with the 3500/70-01-00? Yes, the "01" I/O module is specifically designed to interface with both Proximitor and Velomitor sensors.
• What happens to the 4-20mA output if the monitor goes into "Bypass"? The Bypass LED will illuminate, and the alarm logic will be inhibited; however, the recorder output will typically continue to reflect the current signal level.
• How do I configure the specific impulse bands? Impulse bands (start and duration) are configured using the 3500 Rack Configuration Software with 1-degree resolution.
• Is the 3500/70-01-00 compatible with internal barriers? This specific part number (-01-00) uses internal terminations without barriers. Barrier versions require a different A-suffix.
• Selection Guide: Why prioritize the 3500/70-01-00 for Recip machines? Standard vibration modules can miss short-duration impacts; the 3500/70-01-00 is purpose-built to catch these "shocks," ensuring complete protection for reciprocating frames.

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