BENTLY 135785-01

Description

1. Product Overview

2. Product Parameters

2.1 Core Monitoring Specifications

• Speed Measurement Range: 0–100,000 RPM (configurable in 0.1 RPM increments)
• Keyphasor Input: 1 channel (compatible with inductive, optical, or magnetic sensors)
• Speed Accuracy: ±0.01 RPM (at steady state), ±0.1 RPM (transient conditions)
• Phase Resolution: 0.1° (for keyphasor-based vibration analysis)
• Alarm Thresholds: Programmable overspeed (1st/2nd stage), underspeed, and speed rate-of-change alarms

2.2 Electrical Parameters

• Power Supply: 24 VDC ±10% (powered via 3500 rack backplane)
• Power Consumption: ≤8 W
• Input Signals: TTL/CMOS (keyphasor), sine wave (speed sensor), 4–20 mA (remote speed input)
• Output Signals: 4–20 mA (speed), relay contacts (overspeed trip), Modbus TCP/IP (speed/phase data)
• Isolation: 2500 VAC between input/output and backplane; 1500 VAC between channels

2.3 Environmental & Mechanical Parameters

• Operating Temperature: -40°C to +85°C
• Storage Temperature: -55°C to +100°C
• Relative Humidity: 5%–95% (non-condensing, MIL-STD-810G compliant)
• Protection Rating: IP20 (rack-mounted); IP65 optional with rugged enclosure
• Mounting: Bently 3500 series chassis (1-slot width, 3U height)
• Dimensions: 165 mm × 120 mm × 45 mm (L×W×H)
• Weight: ~0.65 kg

2.4 Certification & Compatibility

• Certifications: ATEX II 2G Ex ib IIC T4, IECEx, UL 508, SIL 2 (IEC 61508)
• Compatible Systems: Bently 3500/22M, 3500/40M, 3500/60M racks; Siemens PCS 7, Honeywell Experion DCS; Bently System 1® software
• Sensor Compatibility: Bently 3300 XL keyphasor probes, optical encoders, magnetic pickup sensors (MPS)

3. Advantages & Features

1. Ultra-Precise Speed Measurement: BENTLY 135785-01 uses advanced digital signal processing (DSP) to achieve ±0.01 RPM steady-state accuracy, ensuring reliable grid synchronization for generators and precise speed control for compressors.
2. Dual-Function Keyphasor/Speed Monitoring: A single BENTLY 135785-01 module combines speed tracking and keyphasor reference capabilities, eliminating the need for separate modules and reducing 3500 rack complexity.
3. Configurable Alarm Logic: Users can set multi-stage overspeed trips, underspeed warnings, and speed rate-of-change limits via System 1® software, allowing BENTLY 135785-01 to adapt to specific machinery safety requirements (e.g., turbine vs. pump).
4. Robust Sensor Compatibility: Supports inductive, optical, and magnetic speed/keyphasor sensors, making BENTLY 135785-01 compatible with existing machinery instrumentation and reducing retrofitting costs.
5. Extreme Environmental Tolerance: Rated for -40°C to +85°C operation and compliant with MIL-STD-810G for shock/vibration, BENTLY 135785-01 performs reliably in harsh environments like offshore platforms and arctic power plants.

4. Application Fields & Cases

4.1 Application Fields

• Power Generation: Steam/gas turbine speed synchronization, generator rotor phase monitoring, hydroelectric turbine speed control
• Oil & Gas: Pipeline compressor speed regulation, LNG plant cryogenic pump keyphasor monitoring, refinery expander overspeed protection
• Petrochemical: Reactor agitator speed tracking, extruder rotor phase analysis, cooling tower fan overspeed detection
• Manufacturing: Steel mill rolling mill speed control, paper mill dryer cylinder phase monitoring, cement plant kiln drive speed protection

4.2 Typical Cases

1. Gas Turbine Grid Synchronization: A 400 MW combined-cycle power plant deployed BENTLY 135785-01 to monitor turbine speed during startup. The module’s ±0.01 RPM accuracy enabled precise synchronization with the electrical grid, reducing startup time by 20% and minimizing wear on turbine components.
2. Compressor Overspeed Protection: An offshore natural gas platform used BENTLY 135785-01 to protect centrifugal compressors from overspeed events. When a control valve failure caused a sudden speed increase, the module triggered a 2nd-stage overspeed trip, shutting down the compressor before damage occurred—saving $1.2 million in repairs.
3. Refinery Expander Fault Diagnosis: A petrochemical refinery integrated BENTLY 135785-01 with vibration modules to analyze expander rotor faults. The keyphasor signals from BENTLY 135785-01 correlated vibration peaks with rotor position, identifying a cracked rotor blade that would have caused a catastrophic failure if left unaddressed.

5. Competitor Comparison

6. Selection Suggestions & Precautions

6.1 Selection Suggestions

1. Machinery Speed Range: BENTLY 135785-01 (0–100,000 RPM) is ideal for high-speed equipment like turbines and compressors; for low-speed machinery (≤1000 RPM), select Bently 135785-02 (optimized for low-RPM accuracy).
2. Sensor Type Compatibility: Choose modules with optical sensor input support for clean environments (e.g., power plants); select magnetic pickup compatibility for harsh, dirty environments (e.g., refineries).
3. Safety Requirements: Opt for ATEX/IECEx-certified versions for explosive zones; select SIL 2-rated configurations for safety-critical applications (e.g., nuclear power plant turbines).

6.2 Precautions

1. Sensor Installation: Align keyphasor sensors per Bently’s recommended gap (0.5–1 mm for inductive probes) to ensure reliable signal detection; use shielded cables and ground them at the module end to minimize EMI.
2. Calibration Requirements: Calibrate BENTLY 135785-01 annually using a precision tachometer (e.g., Bently Calibrator 9010) to verify speed accuracy; reconfigure alarm thresholds after calibration to maintain compliance with safety standards.
3. Maintenance Checks: Inspect sensor mounting hardware every 6 months for loosening (critical for high-vibration environments); clean optical sensors regularly to prevent signal blockage from dust or debris.
4. Configuration Best Practices: Set overspeed trip thresholds at 110% of rated speed (per industry standards); enable speed rate-of-change alarms to detect sudden acceleration/deceleration events (e.g., caused by gearbox failure).

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