BENTLY 3500/50 133388-02

Description

BENTLY 3500/50 133388-02 Two-Channel Tachometer Module

1. Product Description

• Dual-Channel Speed Measurement: Supports two independent input channels for simultaneous monitoring of primary and redundant speed signals from proximity probes or magnetic pickups, ensuring accuracy within ±0.1% of the measured value.
• Acceleration and Direction Analysis: Detects rapid changes in rotational speed (acceleration) and shaft direction, critical for identifying imbalances, misalignments, or gearbox faults that could lead to catastrophic failures.
• Peak Hold and Event Logging: Stores the highest recorded speed, reverse speed, and number of reverse rotations, enabling operators to analyze historical performance and set maintenance thresholds.
• Alarm and Trip Functions: Compares real-time measurements against user-configurable setpoints and triggers relay outputs for alarms or emergency shutdowns, reducing unplanned downtime by up to 40% in high-speed machinery applications.
• Keyphasor Signal Conditioning: Provides conditioned keyphasor signals to the 3500 system backplane, eliminating the need for a separate module and simplifying system architecture.

2. Technical Parameters

Parameter	Specification
Brand	BENTLY
Model	3500/50 133388-02
Module Type	Two-Channel Tachometer Module
Input Channels	2 (proximity probes or magnetic pickups)
Sensor Compatibility	BENTLY 3300 Series proximity probes, 3900 Series magnetic pickups, and third-party inductive sensors
Speed Range	0–100,000 RPM (magnetic pickups), 0–20,000 RPM (proximity probes)
Frequency Response	DC–10 kHz (speed), DC–5 kHz (keyphasor)
Output Signals	2x 4–20 mA (speed amplitude), 2x relay contacts (alarm/trip), digital data via 3500 System Bus
Power Supply	24 VDC ±15% (powered by 3500 System rack)
Power Consumption	<8 W
Operating Temperature	-40°C to +85°C (-40°F to +185°F)
Vibration Resistance	5g peak (10–2000 Hz, IEC 60068-2-6 compliant)
Dimensions	48 mm (width) × 160 mm (height) × 240 mm (depth)
Weight	0.9 kg (1.98 lb)
Certifications	CE, ISO 13849 PL d (machine safety), RoHS, API 670 compliant (for critical machinery protection)

BENTLY 3500/50 133388-02

3. Advantages and Features

• Precision and Redundancy:
  • Dual-channel design with automatic channel failover ensures continuous monitoring even if one sensor or channel fails, reducing single-point risks in mission-critical applications.
  • Achieves ±0.1% speed measurement accuracy, enabling precise overspeed protection for turbines and compressors.
• Robust Signal Processing:
  • Advanced noise-filtering algorithms eliminate electromagnetic interference (EMI) and vibration-induced noise, ensuring clean signal integrity in harsh industrial environments.
  • Supports both rising and falling edge detection, offering flexibility in sensor alignment and installation.
• Ease of Integration:
  • Plug-and-play compatibility with the 3500 System’s configuration software allows drag-and-drop setup, reducing commissioning time to less than 2 hours.
  • Hot-swappable design enables module replacement without powering down the entire system, minimizing downtime during maintenance.

4. Application Areas and Case Study

Application Areas:

• Power Generation: Steam turbines, gas generators, and wind turbine gearboxes requiring precise speed control and overspeed protection.
• Oil & Gas: Centrifugal compressors, pump trains, and offshore drilling rigs where reliable speed monitoring is critical for process safety.
• Manufacturing: High-speed motors, conveyor systems, and precision rotating equipment in automotive, aerospace, and food processing industries.

Case Study:

5. Competitive Comparison

• Superior System Integration: Native compatibility with the 3500 System’s unified hardware and software ecosystem, eliminating the need for external signal converters or complex programming.
• Extreme Environment Performance: Operates across a wider temperature range and withstands higher vibrations than most alternatives, making it ideal for applications where other modules might fail.
• Enhanced Safety Compliance: Meets ISO 13849 PL d safety standards, providing a higher level of safety integrity for critical protection loops compared to basic industrial tachometers.
  

  BENTLY 3500/50 133388-02

6. Selection Recommendations

• System Compatibility: Ensure your setup uses a BENTLY 3500 System rack and compatible sensors (e.g., 330104 proximity probe for low-speed applications or 3901 magnetic pickup for high-speed scenarios).
• Environmental Conditions: Choose the 3500/50 133388-02 for sites with extreme temperatures, high vibrations, or corrosive atmospheres, where its rugged design is essential for long-term reliability.
• Redundancy Needs: Opt for this dual-channel model for critical machinery requiring fail-safe monitoring; consider single-channel variants for non-critical applications to optimize costs.
• Speed Range Requirements: Verify that the module’s speed range and sensor compatibility match your equipment’s operational parameters (e.g., low-speed pumps vs. high-speed turbines).

7. Precautions

• Installation:
  • Route sensor cables separately from high-voltage or high-frequency cables to minimize EMI, and secure connections with a torque wrench (1.5 N·m) to prevent loose contacts.
  • Align proximity probes to the manufacturer-recommended air gap (e.g., 1.5 mm) using calibrated feeler gauges to ensure accurate signal transmission.
• Calibration:
  • Perform annual calibration using a certified tachometer to validate speed measurement accuracy, and use the 3500 System’s configuration software to check sensor linearity.
• Maintenance:
  • Inspect module status LEDs quarterly to ensure proper power and communication, and replace backup batteries every 5 years to preserve configured settings.
  • Clean connectors with isopropyl alcohol in high-humidity environments to prevent corrosion and signal degradation.
• Safety:
  • De-energize the 3500 System rack and follow lockout/tagout procedures before installing or servicing the module to avoid electrical hazards.
  • In hazardous areas, ensure installation complies with local safety standards (e.g., ATEX, IECEx) using approved explosion-proof enclosures.