Contact Platform Support
Help CenterBently Nevada 3500/50M-01-CN Tachometer Monitor for the 3500 Machinery Protection System
Related Products
-
Bently Nevada 330101-00-56-10-02-00 Proximity Probe – Displacement Sensing for Centrifugal CompressorsNegotiableMOQ: 1 Combo -
Bently Nevada 3500/15-IS Power Supply Module – Reliable, Redundant Power for 3500 Machinery Protection RacksNegotiableMOQ: 1 Combo
-
Bently Nevada 3500/04-IS Ground Module – Single‑Point Earthing for 3500 Racks in I.S. EnvironmentsNegotiableMOQ: 1 Combo
-
Bently Nevada 3500/40-01 Vibration Monitoring Module for Proximitor SensorsNegotiableMOQ: 1 Combo
-
Bently Nevada 350900HTVAS-A0-B4 Probe Connection Cable – High‑Temperature Lead for Proximity/Vibration SensingNegotiableMOQ: 1 Combo
The Bently Nevada 3500/50M-01-CN is a tachometer monitor module designed for speed and phase reference measurements within the 3500 online monitoring and protection system. It’s typically used to provide precise rotor speed, zero-speed, and reverse-rotation detection on critical rotating assets—think steam turbines, compressors, and large pumps. From my experience, this is the module teams install when they want stable speed capture and clean phase pickup for advanced diagnostics and trip logic.
Key FeaturesDedicated speed and phase monitoring – Measures shaft speed and provides a phase reference for vibration analysis and 1×/2× tracking.
Flexible input types – Accepts Proximitor/Keyphasor proximity probe inputs and, in many cases, magnetic pickup signals for a wide range of machines.
Protection-grade alarming – Configurable alert and danger setpoints for speed, zero-speed, reverse rotation, and rotor acceleration where applicable.
Buffered outputs for diagnostics – Buffered transducer outputs available at the rear I/O for easy connection to portable analyzers.
Seamless 3500 rack integration – Works natively with the 3500/22M TDI for network communications to System 1 and to DCS/PLC via Modbus/TCP.
Localized option “-CN” – Typically indicates Chinese labeling/documentation, which seems to be preferred for mainland installations and audits.
Hot-swappable serviceability – Front-module replacement in a powered rack minimizes downtime during maintenance.
| Brand / Model | Bently Nevada 3500/50M-01-CN (Tachometer Monitor) |
| System Compatibility | 3500 Machinery Protection System (front monitor + matching rear I/O module) |
| Power Requirements | Supplied via 3500 rack backplane; no separate power supply |
| Channels | 2 tachometer channels (speed/phase), configurable pulses-per-rev |
| Signal Inputs | Proximitor/Keyphasor proximity probe; magnetic pickup support depending on I/O option |
| Buffered Outputs | Rear I/O buffered outputs for each channel (for portable data collectors) |
| Communications | Via 3500/22M TDI: Ethernet to System 1, Modbus/TCP for DCS/PLC integration |
| Operating Temperature | Typically -30 to +65 °C (3500 series class) |
| Installation Method | 19-inch 3500 rack; front monitor card with matching rear I/O terminal module |
You’ll commonly see the 3500/50M deployed on critical rotating equipment where reliable speed feedback is non-negotiable:
Steam and gas turbines – speed, turning gear detection, and overspeed trip logic integration.
Centrifugal and axial compressors – speed/phase reference for vibration tracking and surge protection schemes.
Large pumps, blowers, and fans – zero-speed and reverse-rotation monitoring for safe starts/stops.
Generators and expanders – stable phase reference for order-based analysis and balancing.
Reliability – Purpose-built for protection duties; in most cases, it stays stable even at low rpm where some third-party tach modules get noisy.
Compatibility – Drop-in fit for existing 3500 racks, with consistent configuration workflows and spare-parts strategy.
Lifecycle economy – Shared spares, common training, and direct tie-in to System 1 can cut support hours and unplanned downtime.
Localization – The “-CN” variant usually ships with Chinese labeling/documentation, smoothing audits and on-site operations.
Support ecosystem – Wide installed base means proven field practices, known failure modes, and accessible expertise.
Panel/Rack – Install in a 3500 rack (19-inch). Keep good ventilation around the cabinet; avoid heat sources and heavy EMI.
Wiring – Use shielded cables for proximity probes or MPUs. Ground at one end only to minimize loops. Maintain correct probe gap and observe pulse polarity.
Setpoints – During commissioning, validate speed, zero-speed, reverse-rotation, and acceleration setpoints with a controlled run-up.
Diagnostics – Leverage buffered outputs for periodic checks. A maintenance lead at a compressor station told me their low-speed capture remained stable after a year of operation—no recal needed.
Firmware/config management – Keep monitor firmware aligned with the 3500/22M TDI revision. Back up configurations to your CM system after any change.
Routine care – Inspect connectors, clean dust from the cabinet, and verify probe tip condition during outages. Replace worn MPUs proactively on gear-driven shafts.
CE marked and UL/cUL listed (3500 series family); RoHS compliant in most builds.
Hazardous area ratings commonly available for 3500 modules (e.g., ATEX/IECEx Zone 2, Class I Div 2), depending on the exact build code.
Manufactured under ISO 9001 quality systems.
Manufacturer’s warranty—typically 2 years for standard configurations.
One thing I appreciate is how the 3500/50M closes the loop between protection and diagnostics—speed and phase data are clean, which makes the rest of your vibration setup behave. If you’re retrofitting or standardizing across sites, this module tends to slot in with minimal headaches.
Send Inquiry to This Supplier
You May Also Like
-
Bently Nevada 3500/42-01-01 – 4‑Channel Proximitor/Seismic Monitor for Critical Machinery ProtectionNegotiableMOQ: 1 Combo
-
Bently Nevada 330180-90-05 Proximitor Sensor – Front-end Conditioning for 3300 XL Proximity MeasurementsNegotiableMOQ: 1 Combo
-
Bently Nevada 3500/92-IS Communications Module – Reliable Modbus Gateway for the 3500 Machinery Protection RackNegotiableMOQ: 1 Combo
-
Bently Nevada 3500/42-I-01 Proximitor/Seismic Monitor – 4‑Channel Vibration Protection for Critical MachineryNegotiableMOQ: 1 Combo
-
Bently Nevada 3500/65-01-01 Input Module – High-integrity Signal Acquisition for the 3500 Protection SystemNegotiableMOQ: 1 Combo
-
BENTLY 330180-91-05 Preamplifier for Proximity MonitoringNegotiableMOQ: 1 Combo
-
Bently Nevada 3500/25-02-01 Keyphasor Module – Dual-channel Phase Reference for Precise Speed and Phase TrackingNegotiableMOQ: 1 Combo
-
Bently Nevada 3500/33-IS-01 Relay Module – Intrinsically Safe, 16‑Channel Alarm/Trip Outputs for 3500 RacksNegotiableMOQ: 1 Combo
-
Bently Nevada 3500/33-01-01 – Dual Speed/Acceleration Monitor for Critical Machinery ProtectionNegotiableMOQ: 1 Combo
-
Bently Nevada 990-MOD Preamplifier – Stable, Low-noise Front-end for Proximity and Vibration MeasurementNegotiableMOQ: 1 Combo
