Product Short Description
350091M is the simplified marking for official model 3500/91M, a high-precision dedicated dual-channel monitoring module from Bently Nevada 3500 Series Machinery Protection System. This module is professionally designed for continuous measurement, analysis and safety protection of steam turbine rotor-stator differential expansion axial thermal displacement. It receives linear analog signals from 33085 series 25mm large-range differential expansion eddy current proximity probes and matching proximitors, performs professional signal conditioning, low-frequency filtering, displacement calculation and multi-level alarm/trip logic judgment.
Description
Detailed Technical Specifications
| Parameter | Exact Specification |
|---|---|
| Product Series | 3500 Series Machinery Protection Monitoring System |
| Official Model | 3500/91M (Short Marking: 350091M) |
| Channel Quantity | 2 independent fully isolated differential expansion input channels |
| Matching Sensor Type | 33085 series 25 mm large-range differential expansion eddy current proximity probes & dedicated proximitors |
| Input Signal Type | Linear DC analog voltage signal from proximitor output |
| Input Voltage Range | 0 VDC to -10 VDC full linear input range |
| Matching System Sensitivity | 0.787 V/mm (20 mV/mil), dedicated for differential expansion measurement |
| Measurable Linear Displacement Range | 0 mm to 12.7 mm (0 to 500 mils) |
| Measurement Resolution | 1 μm |
| Frequency Response Bandwidth | DC to 1 kHz, low-frequency optimized for slow thermal expansion displacement |
| Alarm Configuration | Independent adjustable Alert 1, Alert 2 and Danger Trip limits per channel |
| Trip Action Mode | Configurable latching trip / non-latching trip |
| Signal Filter Type | Low-pass anti-drift filtering, anti-interference smoothing filtering |
| Power Supply | 24 VDC backplane power supplied by 3500/15 power supply module |
| Maximum Current Consumption | 185 mA |
| Operating Temperature Range | -40 °C to +85 °C |
| Storage Temperature Range | -55 °C to +125 °C |
| Operating Humidity | 0% – 95% non-condensing |
| Mounting Mode | Standard half-slot insertion into 3500 system rack backplane |
| Hot-Swap Support | Fully hot-swappable, no system shutdown required for replacement |
| Signal Isolation | Complete galvanic isolation between input channels and system backplane |
| Fault Diagnosis Functions | Probe open circuit, cable short circuit, signal loss, transducer fault automatic real-time detection |
| EMC Performance | Compliant with EN 61000-6-2, EN 61000-6-4, high EMI/RFI immunity |
| Module Dimensions | Standard 3500 half-slot size |
| Module Weight | 0.38 kg |
| Compliance Standards | API 670 4th Edition, CE, UL, CSA, IECEx intrinsically safe certification |
| Origin | United States |
Core Functional Features
- Dual Independent Redundant Differential Expansion Monitoring
Two fully isolated channels realize redundant mutual verification monitoring of turbine rotor-stator thermal expansion difference; eliminates single-point fault risk and greatly improves monitoring reliability.
- Ultra-Large Range High-Precision Measurement
12.7 mm full linear measurement range and 1 μm resolution; accurately captures slow thermal expansion displacement changes during turbine startup, shutdown and load variation conditions.
- Low-Frequency Specialized Signal Optimization
DC–1 kHz bandwidth specially optimized for slow-changing thermal differential expansion; completely filters high-frequency radial vibration noise and improves axial thermal displacement measurement accuracy.
- Multi-Level Configurable Alarm & Trip Protection Logic
Independent adjustable warning alarm, pre-danger alarm and emergency trip protection limits for each channel; supports flexible latching/non-latching trip mode configuration to meet steam turbine safety interlock requirements.
- Complete Real-Time Self-Diagnosis Function
Automatic detection of probe disconnection, cable short circuit, transducer fault and signal loss; immediately outputs fault alarm to system rack and upper monitoring platform.
- Full Galvanic Isolation Design
Electrical isolation between sensor input, module circuit and system backplane; isolates industrial electromagnetic interference and ensures long-term stable signal output.
- Hot-Swappable & Fully Interchangeable Structure
Standard 3500 half-slot plug-and-play hot-swappable design; fully compatible with all 3500 system racks and backplanes, no field recalibration required for replacement.
- Perfect System Integration Compatibility
Seamlessly matches 3500/15 power modules, 3500/33 Keyphasor modules, 3500/22 shaft vibration modules, 3500/62 thrust position modules and system display/relay output modules.
Typical Application Scenarios
- Power Generation Industry (Core Exclusive Application)
Rotor-stator differential expansion axial thermal displacement monitoring and trip protection for steam turbine generator units; prevents severe rotor-stator collision damage caused by excessive thermal expansion difference during startup, shutdown and load change.
- Heavy Steam Turbine Equipment
Differential expansion monitoring for industrial steam turbines, steam-driven turbine drive units and large turbo machinery.
- Oil & Gas Industry
Axial thermal expansion monitoring for large gas turbine units and steam-driven compressor turbine main shafts.
- Power Equipment Manufacturing & Testing
Factory startup/shutdown transient differential expansion testing and operation protection monitoring for new steam turbine complete units.
System Matching & Reliability Information
- Matching devices: 33085 series 25mm differential expansion proximity probes, 3308 series extension cables, 330850 series proximitors, 3500 system racks/backplanes, 3500/15 power modules, 3500/33 Keyphasor modules, 3500/22 vibration modules, 3500/62 thrust modules.
- Warranty period: 12 months for brand new original factory sealed products.
- Product status: Original brand new, in stock, available for global delivery.
- Installation requirement: Installed in dedicated differential expansion monitoring slot of 3500 system rack; supports dual redundant module configuration for high-reliability power plant projects.
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