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Bently Nevada 3500/72M 176449-08 Machinery Protection Module

Bently Nevada 3500/72M 176449-08 Machinery Protection Module

Product Description

The 3500/72M (176449-08) is a four-channel Recip Rod Position Monitor designed for the Bently Nevada 3500 Series rack platform. It is specifically engineered to protect reciprocating machinery by processing signals...

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SKU: 3500/72M 176449-08
Vendor: Bently Nevada
Category: Machinery Protection Module
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Product Description

The 3500/72M (176449-08) is a four-channel Recip Rod Position Monitor designed for the Bently Nevada 3500 Series rack platform. It is specifically engineered to protect reciprocating machinery by processing signals from eddy-current Proximitor® sensors.

This module continuously monitors rod position relative to the pressure packing, enabling accurate detection of rod drop caused by excessive rider band wear. Early identification of rod drop conditions helps prevent severe cylinder, piston, and packing damage, significantly reducing unplanned downtime in critical assets.

Technical Specifications

Parameter Specification
Module Type 3500/72M
Part Number 176449-08
Input Channels 4 Proximitor (Eddy Current) sensor inputs
Measurement Variables Rod Drop, Rod Position, Instantaneous Displacement
Measurement Range 0 to 10.0 in (254 mm) typical full scale
System Accuracy ±0.02 in (±0.51 mm)
Digital Resolution 0.001 in (0.025 mm)
Sensor Excitation –24 VDC (supplied from 3500 rack backplane)
Frequency Response Optimized for low-frequency reciprocating cycles
Operating Temperature –40°C to +85°C (–40°F to +185°F)
Analog Output 4–20 mA proportional outputs per channel (via I/O module)
Rack Requirement One full-height slot in 3500 rack

Industrial Applications

The 3500/72M (176449-08) is widely deployed in high-reliability environments such as:

  • Oil refineries

  • Gas processing facilities

  • Petrochemical plants

  • Large reciprocating compressors

  • High-pressure injection pumps

  • Industrial gas engines

It provides continuous condition monitoring of crosshead guides and piston rods, ensuring safe operation of mission-critical reciprocating machinery.

Frequently Asked Questions

Does this module support Rod Drop measurements?
Yes. The 3500/72M is specifically designed for Rod Drop monitoring and is considered an industry-standard solution for detecting rider band wear beyond allowable thresholds.

Is the 176449-08 a stand-alone unit?
No. This is a plug-in module intended for installation within a Bently Nevada 3500 rack. It requires a compatible I/O module for field sensor wiring and signal output configuration.