86517-xx-xx-01-02 MOD159840-01 Bently Nevada Accelerometer Interface Module

Introduction: Solving the Challenge of Accurate Vibration Monitoring

The 86517-xx-xx-01-02 MOD159840-01 from Bently Nevada addresses this challenge by converting charge signals from piezoelectric accelerometers into clean, scaled acceleration and velocity outputs. This module ensures that monitoring instruments receive reliable data, even over long cable runs, enabling early detection of mechanical faults.

Key Features and Technical Specifications

The 86517-xx-xx-01-02 MOD159840-01 is engineered for precision and durability. Its core specifications include:

• Supply Voltage: -23 Vdc to -26 Vdc
• Current Draw: 22 mA maximum
• Acceleration Output Sensitivity: 10 mV/g pk (1.02 mV/m/s² pk), balanced output, 50 ohm nominal impedance
• Velocity Output Sensitivity: 100 mV/in/s pk (3.93 mV/mm/s pk), balanced output, 100 ohm nominal impedance
• Dynamic Range (Acceleration): 750 gs (7350 m/s²) typical without barriers; 500 gs (4902 m/s²) with barriers
• Dynamic Range (Velocity): 20 in/s pk (508 mm/s pk) from 25 Hz to 1000 Hz
• Accuracy: ±5.0% of calculated velocity in the passband at 77°F (25°C)
• Operating Temperature: +32°F to +158°F (0°C to 70°C)
• Storage Temperature: -40°F to +185°F (-40°C to +85°C)
• Humidity: 0 to 95%, noncondensing

One distinctive feature is the 12th order bandpass filter with selectable corner frequencies (e.g., 25 Hz high pass / 350 Hz low pass). This filter ensures that only the relevant vibration frequencies are passed, reducing noise and improving signal quality for accurate analysis.

Applications and Use Cases

The 86517-xx-xx-01-02 MOD159840-01In a typical scenario, an engineer might use this module to connect a piezoelectric accelerometer to a vibration monitoring system. The module's ability to buffer signals over long cable lengths makes it suitable for installations where the monitoring panel is located far from the machine. Additionally, its bandpass filtering capability helps isolate specific vibration frequencies, which is essential for diagnosing bearing wear or imbalance.

Installation and Setup

Proper installation is crucial for optimal performance. For the accelerometer-to-interface connection, use extension cables such as Bently Nevada part numbers 45358-07, 45358-09, or 83387-xxx (or equivalent). For the interface-to-monitor wiring, use 18 to 22 AWG stranded, three-conductor wire with insulating sheath and 100% shield coverage, up to 1000 feet (305 meters) maximum. Recommended cables include Belden 83336 (18 AWG) or Belden 83334 (22 AWG). Ensure that the accelerometer pole-to-pole capacitance plus extension cable capacitance does not exceed 8300 picofarads to maintain signal integrity.

Maintenance and Reliability

To ensure long-term reliability, periodically inspect all connections and cables for signs of wear or damage. Verify that the module is operating within its specified temperature range and humidity limits. Because the module is designed for industrial environments, routine checks should focus on the integrity of the shielding and grounding. Always follow the manufacturer's manual for any specific maintenance procedures.

Compatibility and Integration

The 86517-xx-xx-01-02 MOD159840-01 is designed to work with Bently Nevada monitoring systems. It accepts input from piezoelectric accelerometers with sensitivity options of 50 pC/g or 100 pC/g. The module provides both acceleration and velocity outputs, making it versatile for various monitoring configurations. For integration, ensure that the monitoring instrument is compatible with the output sensitivities and impedance levels specified.

Troubleshooting Common Issues

If the output signal appears noisy or distorted, first check the cable connections and shielding. Verify that the accelerometer capacitance is within the specified limit. If the signal is weak, confirm that the correct sensitivity option (50 pC/g or 100 pC/g) is selected. For persistent issues, consult the official Bently Nevada documentation or contact AutoDCSTech for technical support.

Product Support and Availability

AutoDCSTech offers the 86517-xx-xx-01-02 MOD159840-01 as a quality industrial automation part. Please verify current lifecycle status and availability with AutoDCSTech before ordering. Our team is ready to assist with any technical questions.