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Help CenterBENTLY NEVADA 3500/72M – Dual‑Channel Vibration Monitoring Module for Critical Machine Protection
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Warranty: 365 days
Delivery: 1 week for in‑stock; no more than one month at the latest
Payment: 50% advance payment; full payment prior to delivery
Express options: FedEx, UPS, DHL
Dual vibration channels – Monitors two independent dynamic inputs for radial, axial, or casing vibration on one compact card.
Multiple transducer support – Works with proximity probes (eddy‑current) and seismic sensors (accelerometers/velocity) depending on I/O option set.
Protection-grade alarms – Configurable Alert and Danger thresholds per channel with OK status, suitable for API 670‑style protection schemes.
Buffered dynamic outputs – Front BNC and rear terminals provide raw, wide‑band signals for portable analyzers and diagnostics.
4–20 mA proportional outputs – Typically available per channel for DCS/PLC trending without extra hardware.
Backplane integration – Communicates via the 3500 backplane and 3500/22M TDI for Ethernet connectivity to System 1.
Rack-wide interoperability – Drives system relays via 3500 relay modules and shares keyphasor/speed data from other rack cards.
Drop‑in replacement – Fits a single monitor slot with a matching rear I/O module; ideal for spares and expansions.
| Brand / Model | BENTLY NEVADA 3500/72M |
| HS Code | 903289 (Automatic regulating/controlling instruments, other) |
| Power Requirements | Powered via 3500 rack backplane; no separate external supply |
| Operating Temperature | 0 to +65 °C (typical for 3500 rack components) |
| Signal Input Types | 2 dynamic vibration channels; proximity probes (eddy‑current), accelerometers, or velocity transducers (per I/O option) |
| Outputs | Buffered dynamic outputs (front BNC & rear); 4–20 mA proportional outputs per channel (where equipped) |
| Communication Interfaces | Via 3500 backplane to 3500/22M TDI (Ethernet to System 1); no direct Ethernet on monitor |
| Installation Method | Single monitor slot in 3500 rack; matching rear I/O module with terminal blocks; keyed insertion |
| Rack Occupancy | 1 front monitor slot + corresponding rear I/O position |
Typical deployments include:
Steam and gas turbines (radial X‑Y probes on bearings; thrust or casing vibration)
Compressors and expanders (coverage for two bearings or one bearing X‑Y)
Pumps and fans (casing acceleration and velocity trending)
Gearboxes (mesh‑related vibration, imbalance, misalignment, looseness)
One thing I appreciate is how easily it pairs with 3500 Keyphasor inputs for phase‑based diagnostics. In many cases, customers run one 3500/72M per bearing train to keep wiring short and diagnostics clean.
Reliability – Proven 3500 platform with protection‑grade alarm processing and OK checks.
Compatibility – Works with standard BENTLY NEVADA transducers (e.g., 3300/3300XL proximities, common IEPE accelerometers) and existing 3500 racks.
Cost control – Dual‑channel format often reduces module count and cabinet space in small retrofits.
Serviceability – Buffered outputs simplify on‑site troubleshooting; module swap is quick with keyed backplane.
Technical support – Configuration is straightforward via the 3500/22M TDI and tools most maintenance teams already use.
A maintenance supervisor recently shared that swapping to a spare 3500/72M took under 15 minutes during a scheduled stop; they verified scaling via the 4–20 mA into the DCS and were back online faster than expected.
Installation & MaintenanceCabinet/rack – Install in a standard 3500 rack within a clean, ventilated enclosure; allow airflow around power supplies.
Wiring – Use shielded, grounded cables for transducers; keep sensor and power cabling separated to minimize noise.
I/O module – Fit the correct rear I/O option for your transducer type; confirm terminal labeling before energizing.
Configuration – Set units (µm, mils, mm/s, g), filters, and alarm setpoints per machine design/API 670 practice.
Safety – Observe ESD precautions; de‑energize the rack or use recommended hot‑swap procedure as applicable.
Routine care – Periodic calibration checks with a portable analyzer; clean connectors; review firmware compatibility through the 3500/22M.
CE compliant; UL/cUL listed; commonly supplied for CSA Class I, Div 2 and ATEX/IECEx Zone 2 environments (verify per rack and I/O option)
RoHS conformity in many later production versions
Manufacturer warranty terms apply; sales warranty: 365 days
3500/22M Transient Data Interface (TDI) – Ethernet link to System 1 and rack configuration
3500/32M Relay Module – System relays for Alert/Danger trip logic
3300/3300XL Proximity Probe systems – Standard eddy‑current transducers for shaft vibration and position
Accelerometers and velocity sensors – For casing vibration measurements
3500 Power Supply – AC or DC options for the rack
If you’re matching an installed base, share the part number string from the card label and the rear I/O option. It seems to save a lot of back‑and‑forth and helps ensure the transducer type, 4–20 mA scaling, and buffered output options align with your current configuration.
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