Bently Nevada 3500/50 Tachometer Monitor
A rack monitor for speed-related measurements from compatible proximity probes or magnetic pickups.
Product Overview
3500/50 is the Bently Nevada tachometer monitor used in the 3500 machinery protection rack for speed and rotation-state measurements. The current 3500/50M documentation describes the maintained module generation and its compatible I/O choices.
Each channel can accept a compatible proximity-transducer signal or magnetic pickup and can be configured for speed, rotor acceleration, reverse rotation or zero-speed behavior. The selected rear I/O establishes internal, external, barrier or TMR field wiring.
The tachometer provides machine operating information but is not the dedicated overspeed detection system. Where overspeed shutdown is required, that independent protection architecture must remain documented and tested.
Performance
Speed measurement
Processes supported transducer signals into configured rotational-speed values.
Acceleration and zero-speed logic
Supports rate-of-change and turning-gear state functions within the tachometer configuration.
Reverse-rotation indication
Uses the approved sensor arrangement and configuration to determine direction state.
Rack integration
Works with the selected rear I/O and 3500 configuration software.
Technical Details
- Manufacturer
- Bently Nevada
- Exact model
- 3500/50
- Current documented generation
- 3500/50M Tachometer Module
- Supported sensors
- Compatible Proximitor probes or magnetic pickups
- Front monitor spare
- 288062-02
- Internal-termination I/O
- 133442-01
- External-termination I/O
- 133434-01
- Internal-barrier I/O
- 136703-01
- TMR external I/O
- 133450-01
- Configuration environment
- 3500 Rack Configuration Software
About IndustryParts
https://www.industryparts.com/Tachometer function and I/O architecture are reviewed together
IndustryParts records the installed 3500 generation, sensor path, rear I/O choice and operating-state requirements before proposing a tachometer spare.
System Integration
Establish the measurement plan
Record sensor type, teeth or target geometry, polarity, expected speed range and direction logic.
Match the rear I/O
Confirm internal, external, barrier or TMR termination before moving any field conductors.
Test operating states
Simulate or safely prove normal speed, zero speed, acceleration and reverse rotation required by the machine plan.
Applications
Rotating speed indication
Monitoring shaft speed on turbines, compressors, pumps and other machinery.
Turning-gear supervision
Detecting zero-speed and low-speed states used by operating procedures.
Direction monitoring
Supporting reverse-rotation indication with the approved sensing arrangement.
FAQ
What must be clarified when the label shows 3500/50 rather than 3500/50M?
Provide the complete front and rear module labels and rack revision so the installed generation and spare architecture can be verified.
Can 3500/50 serve as the plant overspeed trip?
No. Bently Nevada identifies the tachometer as separate from the dedicated overspeed protection system.
Which rear I/O should be ordered for 3500/50?
Select it from the actual field-wiring architecture: internal, external, barrier or TMR termination.
What sensor information belongs with a 3500/50 enquiry?
Include probe or pickup part numbers, target geometry, channel range, polarity, slot and clear termination photographs.
How is 3500/50 accepted after replacement?
Verify configured speed, zero-speed state, acceleration, direction logic, alarms and every required output or recorder path.
