Description
Note: Many products are not yet listed. Please contact us for more product information. Our supply channels are constantly expanding, and we currently have 20 stable shared supply channels. Please confirm the model, product, price, and all other necessary information with customer service before placing an order. We offer new, refurbished, and used products, and prices are adjusted according to the year of the item you require.
Key Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 133388-01 (3500/53) |
| Module Type | Overspeed Detection Monitor |
| Typical Power Draw | 8 W |
| Input Impedance | 20 kΩ |
| Input Signal Range | -24 V to +10 V |
| Max Switched Output Current | 5 A |
| Supported Sensors | Eddy current probes, magnetic speed sensors |
| Mounting | 3500 rack backplane compatible |
| Weight | 0.82 kg |
| Operating Temperature | 0 °C to +60 °C |
| Configuration | Set via 3500 system software |
Product Introduction
The Bently Nevada 133388-01 is the 3500/53 overspeed detection module for the 3500 machinery protection rack. It accepts pulse signals from magnetic or eddy current probes and compares measured shaft speed against configured trip thresholds.
It operates independently of the main vibration monitoring channels. This separation keeps overspeed protection active even if other monitor channels experience communication faults.
133388-01
133388-01
133388-01
Application Scenarios & Field Experience
Unplanned overspeed trips on steam turbines can destroy rotor blades and casings. Many plants rely on hardwired protection logic, but mismatched sensor wiring or uncalibrated threshold settings can leave the protection loop blind. This module adds dedicated speed voting for safety shutdown circuits.
- Power generation – steam turbine shafts, requires independent overspeed trip for boiler-turbine units
- Oil & gas – centrifugal compressors, prevents overspeed during recycle valve failure
- Petrochemical – high-speed process blowers, hardwired safety interlock to drive shutdown
- Industrial utility – gas turbine generators, compliance with local machinery protection audit rules
In my experience at a combined-cycle plant, a 3500 rack had intermittent overspeed alarms. The plant swapped in a spare 133388-01 after isolating the sensor and cabling. The new module locked onto the key phasor signal within 90 seconds, cleared false trips, and the unit stayed online through the remainder of the run cycle. The root cause was degraded input circuitry on the original module.
Standard Operating Procedure (SOP) for Quality Control
- Visual & Origin Inspection: Verify OEM labeling, seal integrity, and part marking against factory drawings; screen for counterfeit markings and mismatched serial formats.
- Live Rig Testing: Install in a test 3500 rack, apply simulated speed pulses, confirm alarm and relay trip action at programmed setpoints.
- Firmware Verification: Record the firmware revision on the module and cross-check compatibility with the target rack firmware revision.
- ESD-Safe Packaging: Use static-dissipative bags and foam; attach test report sheet before sealing the outer carton.
Frequently Asked Questions
Q1: Does 133388-01 work with all existing 3500 racks? A: It requires matching rack firmware. Some older backplane revisions will reject newer module firmware. Load the configuration file in offline software first to confirm compatibility.
Q2: What warranty do you provide on this unit? A: We offer 12 months from the shipment date. The warranty covers verified hardware failure; it does not cover damage from miswiring, overvoltage, or incorrect configuration.
Q3: How fast can this unit ship if it is in stock? A: Stock units ship within 1–3 business days after payment confirmation. Lead time changes for units pulled from remote storage. Confirm stock status with our team before locking your shutdown window.
Q4: Can firmware revision mismatch cause missed overspeed trips? A: Yes. A firmware mismatch can break relay voting logic or alter how the module interprets pulse edges. Always match the firmware version used during your last site commissioning.
Q5: Can I hot-swap this module while the turbine is online? A: Do not hot-swap unless your rack is configured with redundant overspeed channels. Single-channel overspeed loops will lose protection during the swap and create a hazardous gap.
