Model: 8237-1246
Brand: Woodward
Series: ProTech-GII
Core Function: Independent overspeed and over-acceleration protection system for turbines. Continuously monitors rotor speed via magnetic pickups (MPU) and initiates a safe shutdown when overspeed or excessive acceleration is detected. Designed for high-reliability safety applications on gas, steam, and hydro turbines.
HS Code: 8537.10 / 9032.89 (Boards & panels for electric control / Automatic regulating or controlling instruments)
Product Parameters
| Parameter | Specification |
|---|---|
| Product Type | Overspeed Protection System |
| Mounting | Bulkhead mount |
| Enclosure Rating | IP56 |
| Architecture | Triple Modular Redundancy (TMR) / 2-out-of-3 voted |
| Displays | Three independent 4.2-inch keypad displays |
| Power Input (High Voltage) | 90–264 Vac / 47–63 Hz or 100–150 Vdc (approx. 30 W per module) |
| Power Input (Low Voltage) | Nominal 24 Vdc |
| Trip Outputs | Three independent non-voted trip relays or 2-out-of-3 voted configuration |
| Analog Output | 4–20 mA speed readout |
| Speed Sensing | Magnetic Pickup (MPU) inputs with open-wire detection |
| Dimensions | Approx. 330 × 486 × 153 mm |
| Weight | Less than 27 lbs (approx. 12 kg) |
| Operating Temperature | –20 °C to +60 °C (–4 °F to +140 °F) |
| Storage Temperature | –20 °C to +70 °C (–4 °F to +158 °F) |
| Vibration Resistance | 0.04 G²/Hz, 1.04 Grms (10–500 Hz) |
| Communication | Modbus (for monitoring and diagnostics) |
Advantages and Features
- True independent safety system (operates separately from the main turbine control system)
- Triple modular redundant design for high availability and fault tolerance
- Fast response to overspeed and over-acceleration events
- MPU open-wire / failure detection
- Configurable routine testing of each module while online
- Resistant to sulfur, H₂S, and SO₂ gases
- Clear local indication via three independent displays and keypads
- Flexible power supply options (high-voltage or low-voltage)
- Suitable for bulkhead mounting in industrial environments (IP56)
Application Cases in Application Fields
- Overspeed protection on gas turbines
- Steam turbine protection systems
- Hydroelectric turbine safety systems
- Critical rotating equipment requiring independent overspeed protection
- Power generation plants (utility and industrial)
- Applications complying with API 670 / API 612 recommendations for overspeed protection
- Retrofit of older mechanical or electronic overspeed systems
Comparisons with Competing Products
| Aspect | Woodward 8237-1246 (ProTech-GII) | Mechanical Overspeed Devices | Integrated Turbine Controller Protection |
|---|---|---|---|
| Independence | Fully independent | Independent | Dependent on main control system |
| Redundancy | TMR / 2-out-of-3 | Usually single | Varies |
| Diagnostics | Advanced (MPU detection, testing) | Limited | High |
| Response Time | Very fast (milliseconds) | Mechanical delay | Fast |
| Configuration | Highly configurable | Fixed or limited | Software-based |
| Best For | Dedicated safety systems | Simple applications | When full integration is preferred |
Selection Suggestions and Precautions
Selection Suggestions:
- Confirm whether the application requires voted (2-out-of-3) or independent trip relay outputs.
- Verify power supply type (high-voltage AC/DC or 24 Vdc) matches site conditions.
- Ensure magnetic pickups (MPUs) are compatible with the speed range and installation.
- Consider bulkhead mounting space and environmental conditions (IP56 rating).
Precautions:
- This is a safety-critical device — installation, configuration, and testing must follow Woodward guidelines and applicable safety standards (e.g., IEC 61508, API 670).
- Proper grounding, shielding of speed sensor cables, and correct termination are essential.
- Perform full functional testing (including simulated overspeed) during commissioning.
- Regular proof testing is recommended to maintain safety integrity.
- The system should be treated as an independent protection layer and not relied upon solely as part of the main control system.
- Always refer to the official Woodward ProTech-GII manual for wiring, configuration, and maintenance procedures.
Recent Popular Same-Brand / Related Models
- Other ProTech-GII variants (different mounting or power configurations)
- ProTech-SX and ProTech-GII series overspeed protection systems
- Woodward 505 / 505XT / MicroNet turbine controllers
- Related speed sensing and trip modules
- Modern replacements and migration options within the Woodward safety product family
This product detail page is written in professional English and ready for use on an independent e-commerce website.
Note: Some secondary sources list conflicting descriptions for this part number. The dominant and most consistent identification is the ProTech-GII Overspeed Protection System (bulkhead mount). Always verify the exact configuration against the unit nameplate and Woodward documentation.
