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Bently Nevada 1701/25 Proximitor/Seismic Monitor Module

Configured for dynamic machinery signal processing in the Bently Nevada 1701 FieldMonitor System, the Bently Nevada 1701/25 (161141-01 Proximitor/Seismic Monitor Module) provides direct physical/electrical execution of radial vibration, axial thrust, and casing motion measurements.

Hardware Specifications

Parameter	Specification
Model	1701/25 (161141-01)
Brand	Bently Nevada
Origin	USA
Weight	Not specified (Legacy Module)
Dimensions	Pluggable module for 1701 Terminal Base
Operating Temp	-30 deg C to +70 deg C
Storage Temp	-40 deg C to +85 deg C
Humidity	95% non-condensing
Power Consumption	Not specified (Backplane powered)
Input Types	Proximitor (3300 XL series), Velocity, Accelerometer
Frequency Response	Proximitor: DC to 10 kHz; Seismic: 10 Hz to 1 kHz
Accuracy	+/-1% of full scale at room temperature
Outputs	Buffered Transducer Outputs (Short-circuit protected)

Eddy-Current Probe Scaling and Gap Validation

The module executes precise eddy-current probe scaling to convert raw transducer impedance into linear displacement values. Gap voltage validation is enforced against the standard -10 VDC target range to ensure the proximity probe tip is positioned within the linear measurement region. This prevents rotor dynamics data corruption caused by probe contact or excessive standoff. Cross-talk suppression logic is implemented between channels to maintain signal integrity during high-frequency shaft vibration events.

Frequently Asked Questions

Q: Does the 1701/25 module support hot-swap replacement without powering down the 1701 chassis?

A: No. The module must be installed or removed only after the 1701 FieldMonitor chassis power is disconnected to prevent backplane damage and transient signal errors.

Q: What is the input impedance configuration for seismic transducers?

A: The input impedance is fixed at 10 kOhm for standard configurations, but specialized transducer matching impedances can be applied depending on the specific seismic sensor model connected.

Q: Are buffered outputs electrically isolated from the module's internal processing circuits?

A: No. Buffered outputs are directly derived from the front-end signal path and are short-circuit protected, but they share the common reference ground with the module backplane.

Field Installation Guidelines

Install the 1701/25 module by firmly seating it into the designated slot on the 1701 Terminal Base until the locking tabs engage. Ensure the coaxial cable shielding for proximity probes is grounded at a single point to the terminal base ground bus to minimize electromagnetic interference. Verify that the gap voltage for each eddy-current probe reads approximately -10 VDC before applying machinery load. Confirm that the front-panel LED indicators show a solid "OK" status after power-up.

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