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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.
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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Disclaimer: We are not an authorized distributor or distributor of the product manufacturer of this website, The product may have older date codes or be an older series than that available direct from the factory or authorized dealers. Because our company is not an authorized distributor of this product, the Original Manufacturer`s warranty does not apply.While many DCS PLC products will have firmware already installed, Our company makes no representation as to whether a DSC PLC product will or will not have firmware and, if it does have firmware, whether the firmware is the revision level that you need for your application. Our company also makes no representations as to your ability or right to download or otherwise obtain firmware for the product from our company, its distributors, or any other source. Our company also makes no representations as to your right to install any such firmware on the product. Our company will not obtain or supply firmware on your behalf. It is your obligation to comply with the terms of any End-User License Agreement or similar document related to obtaining or installing firmware.
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