The Bently Nevada 3500/72M-01-00 (3500/72M) is a high-precision, 4-channel monitor designed for the 3500 Machinery Protection System. While often confused with overspeed modules, the 3500/72M specifically functions as a Reciprocating Diaphragm or Rod Position Monitor. It is engineered to monitor the position of the piston rod in reciprocating compressors, providing critical data on rider band wear and rod drop. By utilizing proximity probe signals, the module ensures the mechanical integrity of high-stakes reciprocating machinery, initiating alarms or protective shutdowns when rod position deviates from safety thresholds.
The following technical data applies to the 3500/72M-01-00 configuration, featuring internal terminations for simplified rack wiring:
| Parameter | Specification Details |
| Model Number | 3500/72M-01-00 (3500/72M) |
| I/O Module Type | 01 = Internal Terminations |
| Input Channels | 4 Independent Channels |
| Transducer Types | Proximity Probes (e.g., 3300 XL 8mm) |
| Input Impedance | 10 kΩ |
| Rod Position Scale Factors | 0.79, 3.94, or 7.87 mV/µm (20, 100, or 200 mV/mil) |
| Frequency Response | Peak-Peak: 1 Hz – 600 Hz; Gap: -3 dB at 0.09 Hz |
| Measurement Accuracy | ±0.33% full-scale (Typical), ±1% (Maximum) |
| Outputs | 4 Coaxial Buffered Transducer Outputs (Front Panel) |
| Power Consumption | 7.7 Watts (Nominal) |
| Operating Temp | -40°C to +85°C (-40°F to +185°F) |
| Compliance | API 618, API 670, ATEX, CE, SIL 2 Capable |
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