Bently Nevada 3500/50 133388-02 Tachometer Module 100% New and Original
The Bently Nevada 133388-02 is a tachometer module for the Bently Nevada 3500 Series machinery protection platform. Input Compatibility: Accepts input from proximity probes or magnetic pickups | Peak Hold: Stores highest speed, highest reverse speed, and number of reverse rotations | Reset Capability: Able to reset the peak values. Factory-sealed, tested on live rack with 48-hour burn-in. 12-month warranty. Ships within 24 hours.
Technical Specifications
| Type | Tachometer Module |
|---|---|
| Channels | 2-channel module |
| Input Compatibility | Accepts input from proximity probes or magnetic pickups |
| Peak Hold | Stores highest speed, highest reverse speed, and number of reverse rotations |
| Reset Capability | Able to reset the peak values |
| Signal Processing | Supplies conditioned Keyphasor signals to the backplane of the 3500 rack |
| Dimensions (Height x Width x Depth) | 241.3 mm x 24.4 mm x 241.8 mm (9.50 in x 0.96 in x 9.52 in). |
| Weight | 0.82 kg (1.8 lb.). |
| Versatile Signal Acquisition | Works with proximity probes or magnetic pickups |
| Data Processing | Continuously processes data to determine shaft rotative speed, rotor acceleration, and rotor direction |
| Alarm Generation | Compares measurements against user-programmable alarm setpoints and generates alarms when setpoints are violated |
| Manufacturer | Bently Nevada |
| Model / SKU | 133388-02 |
✓ Ships within 24 hours | ✓ 12-Month Warranty | ✓ Worldwide Delivery
Detailed Product Information
🎯 Monitoring Function & Protection Role
The Bently Nevada 133388-02 is a dedicated monitoring module within the 3500 Series rack. It continuously measures critical machinery parameters and provides relay outputs for alarm and shutdown protection per API 670. Unlike general-purpose I/O, monitor modules implement signal conditioning, filtering, and threshold comparison directly in hardware — ensuring protection response times under 100 milliseconds even if the rack communication is interrupted.
What It Monitors
- Vibration Monitors: Accept Proximitor inputs, extract peak-to-peak amplitude, compare against programmable alarm/danger setpoints.
- Position Monitors: Measure DC gap voltage for thrust position, differential expansion, and rod drop on reciprocating compressors.
- Temperature Monitors: Accept RTD and thermocouple inputs for bearing metal and case temperature monitoring.
- Tachometer/Speed: Accept magnetic pickup or proximity probe inputs for rotational speed and zero-speed detection.
Setpoint Configuration
Alarm and danger setpoints should be established based on ISO 10816 or API vibration standards for your specific machine type. Always document setpoint rationale — during an incident investigation, you will need to justify why the machine tripped (or didn't trip) at a given threshold.
🔧 Technical Specifications & Calibration
Specifications
| Parameter | Value |
|---|---|
| Type | Tachometer Module |
| Channels | 2-channel module |
| Input Compatibility | Accepts input from proximity probes or magnetic pickups |
| Peak Hold | Stores highest speed, highest reverse speed, and number of reverse rotations |
| Reset Capability | Able to reset the peak values |
| Signal Processing | Supplies conditioned Keyphasor signals to the backplane of the 3500 rack |
| Dimensions (Height x Width x Depth) | 241.3 mm x 24.4 mm x 241.8 mm (9.50 in x 0.96 in x 9.52 in). |
| Weight | 0.82 kg (1.8 lb.). |
Calibration & Verification
- Use a calibrated signal source (TK-3 for vibration, decade box for temperature) to inject known test signals.
- Verify the module's front-panel reading matches the injected signal within ±1% of full scale.
- Force each alarm and danger relay by temporarily lowering setpoints below current readings — verify DCS annunciation and trip logic.
- Document all calibration values and relay test results in your maintenance management system.
📦 Shipping & Warranty
24-hour handling. Anti-static packaging. DHL/FedEx/UPS worldwide. 12-month warranty covering component failure, calibration drift, relay failure.
❓ FAQ
Q: How often should monitor modules be calibrated?
A: Bently Nevada recommends annual calibration verification. For SIL-rated safety loops, verify every 6 months per IEC 61511.
Q: Can I hot-swap a monitor module?
A: No. The 3500 rack monitors are NOT hot-swappable. Power down the rack, replace the module, reconfigure if needed, power up, and verify.
Q: My monitor shows OK but the relay doesn't trip during test?
A: Check: (1) Relay module installed in correct slot; (2) Monitor-to-relay channel mapping in Rack Configuration Software; (3) Relay module STATUS LED — if amber, the relay module itself may be faulty.
💰 Protection ROI
This monitor module is the last line of defense between normal operation and catastrophic machine failure. One avoided bearing wipe on a 50 MW turbine saves $500,000+ in repairs and 4+ weeks of downtime. The monitor cost is recovered in the first detected incident — often within months of commissioning.
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