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      3500/72M 149734-08 135489-01

      3500/72M Recip Rod Position Monitor
      Product image is representative; revision or series may vary. Contact us to request a specific version.

      Product Describe：

      3500/72M Recip Rod Position Monitor
      I/O Module with Internal 
      Barriers and Internal 
      Terminations

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      Technical specifications for 3500/72M 149734-08 135489-01

      • Manufacturer:
        Bently Nevada
      • Product Category:
        Machinery Monitoring Systems
      • Spare Part Number:
        3500/72M 149734-08 135489-01
      • Estimated shipping dimensions:
        2.6x25.8x24cm
      • Weight:
        0.85 kg
      • Tariff Code:
        8537101190
      • Counliy of origin:
        USA
      • Input Impedance:
        10 kΩ
      • Power Consumption:
        7.7 watts, nominal
      • Output Impedance:
        510 Ω
      • Transducer Power Supply:
        -24 Vdc
      • Operating Temperature:
        -30°C to +65°C
      • Storage Temperature:
        -40°C to +85°C
      • Humidity:
        Up to 95% non-condensing
      • Input Impedance:
        Greater than 10 kΩ for each signal input
      • Power Consumption:
        7.0 Watts nominal
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      Information

      Overview Manuals Common Applications Product Precautions
      The 3500/72M 149734-08 135489-01 is an Enhanced Reciprocating Rod Drop Monitor specifically designed for reciprocating compressors. By high-precision monitoring of the piston rod's vertical displacement, it provides real-time assessment of rider band wear and delivers critical alarms and safety interlocks, preventing catastrophic contact between the piston and cylinder wall. It serves as a core component for the predictive maintenance of reciprocating machinery. 
        • Rod distance monitoring
        • A single module typically provides 4 channels
        • Set "Warning" and "Danger" limits based on the displacement of the pole spacing
      The four-channel Bently Nevada 3500/72M Recip Rod Position Monitor accepts input from proximity transducers, conditions the signal to provide dynamic and static position measurements, and compares the conditioned signals with user-programmable alarms. Each channel, depending on how you configure it, typically conditions its input signal to generate various parameters called measured values.

      Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. 
       Bently Nevada 3500/72M 149734-08 135489-01 Recip Rod Position Monitor Manuals, Datasheets, Drivers, Link Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description.
      Oil Refining
      Monitoring Hydrogen Makeup Compressors to track rider band wear and prevent piston-to-cylinder contact.

      LNG Terminals
      Monitoring BOG (Boil-Off Gas) Compressors to manage evaporated gas recovery efficiently.

      Natural Gas Processing
      Used on Gas Injection Compressors to ensure mechanical integrity during high-pressure gas reinjection.

      Petrochemical Industry
      Monitoring Ethylene/Propylene Compressors to avoid unplanned downtime in continuous production cycles.

      Gas Storage Facilities
      Monitoring large Withdrawal/Injection Compressors during seasonal gas storage operations.

      Desalination - Reverse Osmosis
      Monitoring Reciprocating High-Pressure Pumps that drive saltwater through filtration membranes.
       When using the Bently Nevada 3500/72M combination, it is essential to ensure strict phase synchronization with the Keyphasor signal to obtain accurate average rod drop readings. Special attention should be paid to the installation angle of the sensor probe relative to the piston rod and the periodic calibration of the rider band wear factor. Additionally, the stability of the sensor gap voltage must be closely monitored to prevent signal drift caused by dynamic impacts or mechanical loosening during reciprocating motion, which could trigger nuisance system alarms.

      FAQ View All FAQ

      • What is the 3500/72M 149734-08 135489-01?
        It is a 4-channel Reciprocating Cylinder Monitor. The 149734-08 is the main module, and the 135489-01 is the I/O module with Prox/Seismic inputs.
      • What is the function of the 135489-01 I/O module?
        It is the physical interface board used to receive raw signals from Proximity or Seismic sensors.
      • What alarm levels does the 149734-08 module support?
        It supports independent Alert and Danger levels for each channel.
      • Can 3500/72M 149734-08 135489-01 monitor rod load?
        Yes, it can calculate and monitor Rod Load (Tension and Compression) to prevent structural damage.
      • Can 3500/72M 149734-08 135489-01 protect against crosshead damage?
        Yes, by monitoring Crosshead Acceleration to detect impacts or looseness.
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