Bently Nevada 3500/50 133388-02 — Tachometer & Speed Monitor Module | 3500 Series Platform
Engineering Background
The Bently Nevada 3500 Series is the industry benchmark for continuous online machinery protection systems, deployed across power generation, oil & gas, petrochemical, and rotating equipment applications worldwide. Engineered to API 670 standards, the platform delivers real-time vibration, position, and speed monitoring with deterministic relay output — making it the preferred choice for turbine, compressor, and pump protection in critical process environments.
Product Positioning
The 3500/50 (P/N 133388-02) is a dedicated Tachometer and Speed Monitor module within the 3500 rack system. It accepts signals from proximity probes or magnetic pickups to measure shaft rotational speed, overspeed events, and zero-speed conditions. The module provides independent relay outputs for alarm and danger setpoints, integrating seamlessly with the 3500 rack’s backplane communication and System 1 software ecosystem. It is the authoritative solution for speed-based machinery protection where API 670 compliance is mandatory.
Complete Technical Specifications
| Manufacturer | Bently Nevada (Baker Hughes) |
| Part Number | 133388-02 |
| Model | 3500/50 |
| Module Type | Tachometer & Speed Monitor |
| Platform | 3500 Series Machinery Protection System |
| Input Signal | Proximity probe (Bently Nevada 3300/3500 series) or magnetic pickup |
| Speed Range | 0 – 99,999 RPM (configurable) |
| Channels | 2 independent speed channels per module |
| Relay Outputs | Alert and Danger relay per channel (SPDT, configurable) |
| Overspeed Detection | Hardware-latched overspeed trip, independent of software |
| Zero-Speed Detection | Configurable zero-speed timeout |
| Communication | 3500 rack backplane (Modbus, System 1 compatible) |
| Power Supply | Supplied via 3500 rack backplane (24 VDC nominal) |
| Operating Temperature | 0°C to +65°C |
| Storage Temperature | -40°C to +85°C |
| Humidity | 5% to 95% RH, non-condensing |
| Compliance | API 670, CE, UL/CSA |
| Form Factor | Single-slot 3500 rack module |
| Weight | Approx. 400 g |
| Configuration Tool | Bently Nevada Rack Configuration Software (RCS) |
Proven Application Environments
- Steam & Gas Turbines — Overspeed protection and speed trending for power generation assets
- Centrifugal & Reciprocating Compressors — Speed monitoring for surge control and process safety
- Pumps & Fans — Zero-speed detection for startup/shutdown sequencing
- Gearboxes — Differential speed monitoring across gear stages
- Marine Propulsion — Shaft speed monitoring in offshore and vessel applications
- Refinery & Petrochemical — SIL-rated speed protection in hazardous area installations
Engineering Advantages
- API 670 Compliant — Meets the international standard for machinery protection systems; accepted by EPC contractors and end-users globally
- Hardware Overspeed Trip — Latched relay output independent of firmware, ensuring fail-safe protection even during software faults
- Dual-Channel Architecture — Two independent speed channels per module reduce rack slot consumption and wiring complexity
- System 1 Integration — Native compatibility with Bently Nevada System 1 software for real-time trending, alarm management, and historical data logging
- Hot-Swap Capable — Module can be replaced under power in a live 3500 rack (with appropriate rack configuration), minimizing plant downtime
- Wide Speed Range — 0–99,999 RPM coverage accommodates low-speed machinery through high-speed turbines in a single module
System Architecture & Signal Flow
The 3500/50 module occupies a single slot in a 3500 rack alongside the power supply (3500/15), rack interface module (3500/20 or 3500/22), and other I/O modules. Proximity probe or magnetic pickup signals enter via the I/O module terminal block, are conditioned and digitized within the 3500/50, and processed against user-configured setpoints stored in non-volatile memory. Alarm and Danger relay outputs are hardwired to the plant DCS or ESD system. Speed data is simultaneously broadcast over the rack backplane to the System 1 data acquisition layer for continuous trending and event capture.
Configuration is performed offline using Bently Nevada Rack Configuration Software (RCS), downloaded to the module via the rack interface, and verified with a function test prior to commissioning.
Sourcing & Quality Verification
- Origin: Genuine Bently Nevada (Baker Hughes) OEM hardware — not aftermarket or clone
- Condition: Tested surplus / refurbished; each unit undergoes functional verification prior to dispatch
- Inspection: Visual inspection for PCB integrity, connector condition, and firmware label verification
- Packaging: Anti-static ESD packaging with foam cushioning; double-boxed for international freight
- Documentation: Certificate of conformance available on request; original Bently Nevada manuals referenced
- Warranty: 12-month operational warranty against manufacturing defects (contact us for terms)
Procurement Process
- Inquiry — Submit your part number and required quantity via the order form or email support@konmask.com
- Quote — Receive a formal quotation with lead time, unit price, and shipping options within 24 hours
- Order Confirmation — Purchase order or proforma invoice issued; payment via T/T, PayPal, or credit card
- Quality Check — Unit inspected and photographed prior to dispatch; test report shared on request
- Shipping — DHL / FedEx / UPS express worldwide; EXW Xiamen or CIF destination available
- After-Sales — Technical support and return/exchange policy within warranty period
Technical FAQ
Q: Is the 133388-02 the same as the 133388-01?
A: The -02 revision typically reflects a firmware or hardware ECO update. Functionally equivalent for most applications, but confirm compatibility with your rack firmware version using Bently Nevada RCS before installation.
Q: Can this module work with a magnetic pickup instead of a proximity probe?
A: Yes. The 3500/50 accepts both eddy-current proximity probes (Bently Nevada 3300/3500 series) and passive magnetic pickups. Input configuration is set in RCS.
Q: Does the module require a dedicated I/O module?
A: Yes. The 3500/50 pairs with a compatible I/O module (e.g., 140471-01) for terminal block wiring. Confirm the I/O module part number against your rack drawing.
Q: What is the maximum number of 3500/50 modules per rack?
A: A standard 3500 rack (3500/05) supports up to 14 I/O module slots. The number of 3500/50 modules is limited by available slots and power budget.
Q: Can I get a datasheet or wiring diagram?
A: Yes — contact support@konmask.com and reference P/N 133388-02. We will provide the relevant Bently Nevada technical documentation.
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