Product Description
The Bently Nevada 3500/70-01-00 is a high-performance 4-channel monitor designed for reciprocating compressor protection. This 3500/70M module continuously monitors crankcase and crosshead vibration to prevent catastrophic machinery failure. It accepts inputs from seismic and proximity transducers, conditioning these signals to deliver precise static values. Engineers rely on this module to drive clear alarm setpoints and protect critical plant assets. It integrates seamlessly into the 3500 Series rack system to provide real-time diagnostic data for operations and maintenance teams.
Technical Specifications
| Parameter | Specification Details |
|---|---|
| Brand | Bently Nevada |
| Model Number | 3500/70-01-00 |
| Module Type | Recip Impulse / Velocity Monitor |
| I/O Option | 01 (Prox/Velom I/O Module with Internal Terminations) |
| Channels | 4 fully programmable channels |
| Frequency Response | Bias filter is -3 dB at 0.01 Hz. Not OK filter is -3 dB at 2400 Hz. |
| Sensitivity Range | Impulse and Acceleration 2 range from 5 to 115 mV/g. Velocity ranges up to 575 mV/in/s. |
| Resolution & Accuracy | Recorder resolution is 0.3662 µA. Channel accuracy is within 0.33% of full-scale typical. |
| Operating Temperature | -30C to +65C (-22F to +149F) for internal terminations |
| Power Consumption | 7.7 watts nominal module consumption |
Diagnostic Capabilities & Channel Functions
- Impulse Acceleration: Tracks high-frequency mechanical impacts across user-defined crank angle bands.
- Recip Velocity: Delivers integrated velocity measurements optimized for low-speed compressor frames.
- Acceleration 2: Provides secondary general-purpose casing vibration tracking.
- Low Frequency Recip Velocity: Employs dedicated integration filters down to 0.34 Hz for slow reciprocating strokes.
- Vector Tracking: Isolates 1X and 2X filtered vector data using a constant Q factor of 16.7.
System Compatibility & Hardware Interface
- The main monitor card occupies exactly one full-height front slot of the 3500 rack.
- The 3500/70-01-00 I/O module installs into one full-height rear slot.
- Front panel coaxial connectors provide independent buffered transducer outputs for each channel.
- Each channel drives a proportional +4 to +20 mA recorder output for PLC/DCS integration.
- Front panel LEDs give immediate status for OK, TX/RX, and Bypass modes.
Installation, Maintenance & Commissioning
- Use the 3500 Rack Configuration Software to set independent Alert and Danger setpoints.
- Internal terminations accept direct wiring without external terminal blocks.
- The module supports live insertion so you can replace cards without shutting down the rack.
- Foldback current protection limits internal current to prevent loop damage.
- Verify input impedance matches 10 kΩ for acceleration or 1 MΩ for velocity sensors.
Applications & Industry Use Cases
- Crosshead back-and-forth acceleration monitoring
- Reciprocating compressor crankcase vibration analysis
- Real-time main bearing structure defect detection
- High-pressure gas injection facility asset protection
Shipping, Warranty & Package Contents
- Package Checklist: Includes one Bently Nevada 3500/70M monitor and one rear I/O module.
- Warranty Terms: This product carries a full 12-month warranty from Oiltech Controls.
- Express Delivery: We ship worldwide via trusted carriers including FedEx, UPS, and DHL.
Frequently Asked Questions
- Can I mix proximity and seismic sensors on one module? Yes, you can program each channel independently via software.
- What does the 01 option signify? It specifies a Proximitor/Velomitor I/O module with internal terminations.
- How fast do the recorder outputs update? The 4-20 mA recorder outputs update in less than 100 milliseconds.
Technical Documentation Download
Get the complete engineering specifications and wiring layouts before installation:
- Please contact our support team to download the official Bently Nevada 3500 System manual.
- For project quotes and technical inquiries, email info@oiltechcontrols.com directly.
- Chat instantly with a specialist via WhatsApp at +86 158 8020 0923 for priority help.
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