Overview
The Bently Nevada 87971-01, also cataloged as the 87971 Dual Vibration Monitor Module, processes two independent vibration channels within compatible Bently Nevada 3300 Series monitoring systems.
Suffix Breakdown & Model Matrix
The supplied data identifies 87971-01 as a fixed part number. No documented suffix matrix or field-level model decomposition was provided, so no additional suffix interpretation is assigned.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 87971-01 |
| Brand | Bently Nevada |
| Product Type | Dual Vibration Monitor Module |
| System Compatibility | Bently Nevada 3300 Series Monitoring Systems |
| Number of Channels | 2 independent monitoring channels |
| Measurement Range | 0 to 10 mils peak-to-peak |
| Transducer Compatibility | 3300 8 mm, 3300 XL 8 mm, 7200 5 mm, and 7200 8 mm proximity transducer systems |
| Operating Voltage | 24 VDC nominal |
| Operating Temp | -20 deg C to +70 deg C |
Eddy-Current Probe Signal Processing
The 87971-01 accepts compatible proximity transducer signals and monitors two independent vibration channels. The specified transducer families include 3300 8 mm, 3300 XL 8 mm, and 7200 5 mm and 8 mm systems.
The module measures vibration within the supplied 0 to 10 mils peak-to-peak range. Therefore, the installed probe, extension cable, and monitor configuration must match the applicable transducer system.
For eddy-current measurement, correct probe installation establishes the physical gap between the probe tip and rotating shaft target. The monitor then processes the resulting electrical signal for vibration monitoring. Installation should therefore maintain the manufacturer’s specified probe geometry and cabling arrangement.
The supplied data does not specify a separate -10 VDC gap-validation requirement for this particular 87971-01 part number. Consequently, no additional gap-voltage limit is assigned here.
Frequently Asked Questions
Q: How many vibration channels does the 87971-01 provide?
A: The supplied specification identifies two independent monitoring channels.
Q: Which proximity transducer systems are compatible with the module?
A: The supplied data lists Bently Nevada 3300 8 mm, 3300 XL 8 mm, and 7200 5 mm and 8 mm proximity transducer systems.
Q: What vibration range does the module monitor?
A: The specified measurement range is 0 to 10 mils peak-to-peak.
Field Installation Guidelines
Install the 87971-01 only in the compatible 3300 Series monitoring hardware and verify connector alignment before energizing the rack.
Match each monitor channel with the designated proximity transducer circuit. Check probe, extension cable, and associated connection points for correct installation before commissioning.
Route transducer wiring separately from high-current power conductors where practical. This reduces the potential for electrical interference in low-level vibration signal circuits.
Where shielded instrumentation cable is used, terminate the shield according to the host system grounding design. Avoid unintended ground loops between the monitoring rack and field equipment.
After installation, verify the 24 VDC supply and confirm that both monitoring channels receive the expected transducer signals. Check the displayed vibration values against the installed machinery and measurement configuration before placing the monitoring channel into service.
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