Bently Nevada Eddy‑current Vibration Monitoring Technology
Bently Nevada is the undisputed leader in the field of rotating machinery condition monitoring and protection worldwide. It is renowned for pioneering the eddy current vibration monitoring technology and defining industry standards (API 670). Its core services are focused on ensuring the safety of critical equipment in heavy industries such as energy, power, and petrochemicals.
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I. Basic Overview
• Full Name: Bently Nevada Corporation (abbreviated as BN / Bently)
• Establishment: 1961, Minden, Nevada, USA
• Founder: Donald E. Bently (pioneer in mechanical vibration / rotor dynamics)
• Current Ownership: Under Baker Hughes (separated from GE in 2019 and merged in)
• Position: Provider of asset protection, condition monitoring, and predictive maintenance software, hardware, and services
• Industry Position: Global leader in TSI (mechanical protection systems), core developer of API 670 standards
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II. Core Product Line (Most Popular in China)
1. 3500 Series (TSI mechanical protection system, highest installation volume) Triple Module Redundancy (TMR) application
• Rack: 3500/05
• Power Supply: 3500/15
• Vibration / Displacement: 3500/42M, 3500/40M
• Shaft Deflection / Axial Position: 3500/45
• Speed / Phase Alignment: 3500/50, 3500/53
• Communication: 3500/92 (Modbus/TCP)
• 3500/22M Transient Data Interface

Note: Suffix M = Enhanced revision; Compliant with API‑670; Divided into Rack & Enclosure, Power Supply, Rack Interface, Keyphasor, Relay, Monitor Modules, Reciprocating Machinery Modules, Communication Gateway, Display Unit & Accessories.
| Model | Description | Function |
|---|---|---|
| 3500/05 | System Rack | 14‑slot main rack, base for all modules |
| 3500/06 | Protective Enclosure | Stainless‑steel / epoxy coated enclosure, purge‑ready explosion‑proof housing |
| Model | Description | Function |
|---|---|---|
| 3500/15 | Power Supply Module | AC / DC input, dual redundant power feeding for whole system |
| Model | Description | Function |
|---|---|---|
| 3500/20 | RIM Rack Interface Module | Legacy rack interface, superseded by 3500/22M |
| 3500/22M | TDI Transient Data Interface Module | Enhanced core interface, waveform & transient data acquisition, USB / Ethernet, system mandatory unit |
| Model | Description | Function |
|---|---|---|
| 3500/25 | Enhanced Keyphasor Module | 2‑channel, speed & phase reference, accepts probe / magnetic pickup input, redundant capable |
| Model | Description | Function |
|---|---|---|
| 3500/32M | 4‑Channel Relay Module | 4‑channel alarm relay output, TMR triple‑modular‑redundancy compatible |
| 3500/33 | 16‑Channel Relay Module | 16‑channel relay output, high‑capacity alarm contact |
| 3500/34 | TMR Relay Module | Dedicated relay module for TMR triple‑modular‑redundancy configuration |
| Model | Description | Channels | Application |
|---|---|---|---|
| 3500/40M | Proximitor Monitor Module | 4‑Channel | Shaft vibration, shaft displacement (eddy‑current probe) |
| 3500/42M | Displacement / Vibration Combined Monitor Module | 4‑Channel | Eddy‑current displacement + seismic vibration (velocity / acceleration), most popular general‑purpose module |
| 3500/44M | Aero‑derivative Gas Turbine Monitor Module | 4‑Channel | Specialized protection monitoring for aero‑derivative gas turbines |
| 3500/45 | Position Monitor Module | 4‑Channel | Thrust position, differential expansion, case expansion, valve position monitoring |
| 3500/46M | Hydro Turbine Monitor Module | 4‑Channel | Hydro‑unit radial vibration, air‑gap monitoring |
| 3500/50M | Tachometer Module | 2‑Channel | Speed, zero‑speed, rotor acceleration monitoring |
| 3500/53 | Overspeed Protection Module | 1‑Channel | TMR overspeed protection, unit trip protection |
| 3500/60 | 6‑Channel Temperature Monitor Module | 6‑Channel | RTD / thermocouple temperature measurement |
| 3500/61 | 6‑Channel Temperature Monitor with 4‑20mA Output | 6‑Channel | Temperature monitoring, per‑channel 4‑20mA recorder output |
| 3500/62 | PVM Process Variable Module | 6‑Channel | 4‑20mA / ‑10~+10V input, monitor pressure, flow and other process variables |
| 3500/64M | Dynamic Pressure Monitor Module | 4‑Channel | Cylinder dynamic pressure, pressure pulsation monitoring |
| 3500/65 | 16‑Channel Temperature Monitor Module | 16‑Channel | High‑density temperature acquisition, mixed RTD / thermocouple input, TMR redundancy support |
| 3500/63 | Hazardous Gas Monitor Module | — | Combustible gas detector input |
All new products and surplus products of the industrial intelligence industry, as well as the discontinued products of the original manufacturers. We are not an authorized distributor or representative of any of the above manufacturers (except for brand authorization). The trademarks, brand names and brands appearing in this agreement are the property of their respective manufacturers.
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Phone(WeChat/Whatsapp)
+086-181 4410 0983
No 1134 Jimei North Road,
Hong Kong Office:
Guan Tang District, Hong Kong,