Product Overview
The Bently Nevada 3500/50-01-00 is a Tachometer Module used within the 3500 Series rack-based machinery protection system. The 133442-01 is the associated rear I/O module (internal termination) that provides the physical connection for field wiring.
The "-01-00" suffix typically indicates a standard tachometer configuration with one or two speed inputs, no special options. This module accepts signals from proximity probes (eddy current), magnetic pickups, or optical transducers to measure rotational speed, direction of rotation, and zero speed. It conditions these signals and provides speed-related outputs to the 3500 rack for alarming, protection, and trending.
The 3500/50 is often used with a Keyphasor signal to provide once-per-turn reference for vibration analysis modules (e.g., 3500/40M, 3500/42M).
Key Parameters (Table)
| Parameter | Specification / Value |
|---|---|
| Manufacturer | Bently Nevada (GE / Baker Hughes) |
| Model | 3500/50-01-00 (Tachometer Module) |
| Rear I/O Module | 133442-01 (internal termination) |
| Number of Channels | 2 (independent speed inputs) |
| Input Types | Proximity probe (eddy current), magnetic pickup, optical sensor |
| Input Voltage Range | -0.8 V to -22 Vdc (proximity) / 100 mV to 100 V peak (magnetic) |
| Speed Range | 0 to 1,000,000 rpm (depending on input and configuration) |
| Accuracy | ±0.05% of reading |
| Outputs | Speed (analog), Keyphasor (pulse), relay alarms (via 3500/32M) |
| Frequency Response | 0.5 Hz to 20 kHz |
| Operating Temperature | -30 °C to +65 °C (-22 °F to +149 °F) |
| Module Type | Rack-mounted (3500 series backplane) |
| Dimensions (3500/50 Module) | Height: 241 mm (9.5 in) Width: 25.4 mm (1.0 in) – 1 slot wide Depth: 242 mm (9.5 in) |
| Dimensions (133442-01 Rear I/O) | Height: 241 mm (9.5 in) Width: 25.4 mm (1.0 in) Depth: 100 mm (3.9 in) approx. |
| Weight (Total) | Approx. 1.0 kg (2.2 lbs) |
*Note: The 3500/50 occupies one front slot; the 133442-01 rear I/O module occupies one rear slot per tachometer module and provides screw-terminal connections for field wiring.*
Application Scenarios
The 3500/50-01-00 with 133442-01 is used in machinery protection, speed monitoring, and vibration analysis systems where accurate speed measurement is critical.
Primary Applications:
Turbine Speed Monitoring
Measuring overspeed, underspeed, and zero speed on steam and gas turbines.
Provides dedicated overspeed trip signals to prevent catastrophic failure (complies with API 670).
Compressor Speed Control
Monitoring rotational speed of centrifugal and axial compressors.
Feeds speed signals to control systems for surge prevention and efficient operation.
Keyphasor Reference for Vibration Analysis
Provides a once-per-turn pulse to 3500/40M or 3500/42M vibration monitors.
Enables phase measurement, orbit plots, and balanced/unbalance diagnosis.
Speed Measurement in Pumps and Fans
Detecting low speed or zero speed conditions to trigger alarms or automatic starts.
Protects pumps from running dry or fans from belt failure.
Direction of Rotation Detection
Using two probes to determine forward/reverse rotation on critical machinery (e.g., hydro turbines, large compressors).
Prevents damage from reverse operation.
Backup Overspeed Protection System
In conjunction with mechanical overspeed devices, the 3500/50 provides electronic overspeed detection with programmable setpoints.
Redundant trip paths increase safety integrity.
Typical 3500 Rack Configuration Example:
Slot 1: 3500/15 Power Supply
Slot 2: 3500/20 Rack Interface
Slot 3: 3500/50-01-00 with 133442-01 → for speed and Keyphasor signal
Slot 4: 3500/42M Vibration Monitor (uses Keyphasor from 3500/50)
Slot 5: 3500/32M Relay Module for overspeed trip logic
Global direct procurement guarantee
All products are purchased directly from overseas original manufacturers or authorized channels, 100% guaranteed genuine quality, sufficient spot inventory, and comprehensive model coverage
Quality Commitment
Each product has been tested by our technicians, providing 12-month long warranty, worry-free after-sales
Flexible procurement plan
- Bulk order enjoys Friendship discount (2 pieces or more can be applied)
- Long-term cooperative customers can apply for priority supply
Full service support
7×24 hours technical consultation, from selection guidance to installation and commissioning to provide full life cycle service (paid)
Why do so many customers choose us?
On the basis of the same quality, we provide:
- More competitive price system
- Faster logistics response
- More complete technical support (free product technical documentation)
Your trust is the driving force for our continuous progress, submit your requirements immediately to get exclusive quotes
