Product Description

The 3500/25 (125792-01) is a high-precision, half-height Keyphasor module designed for the Bently Nevada 3500 Series machinery protection system. This module provides essential once-per-turn (or multiple-event-per-turn) timing signals used by other monitoring modules in the rack to perform vector measurements such as vibration phase and amplitude. It is a fundamental component for any diagnostic strategy involving rotating machinery.

Engineered to process inputs from both proximity probes and magnetic pickups, the 3500/22 (125792-01) converts these raw transducer signals into digital timing data and accurate RPM values. This enhanced version provides superior signal resolution and accuracy, making it suitable for high-speed turbine applications where precise phase measurement is critical for balancing and shaft centerline analysis.

Technical Specifications

• Module Type: Enhanced Keyphasor Module (Half-height)

• Main Part Number: 125792-01

• Series: Bently Nevada 3500

• Input Signal Compatibility: Proximity Probes (Proximitors) or Magnetic Pickups

• Speed Accuracy: ±0.05% of full scale

• Signal Resolution: 0.1 RPM

• Sampling Rate: 1000 Hz

• Power Consumption: 3.2 Watts (Typical)

• Analog Output: 4–20 mA (proportional to speed)

• Operating Temperature: -40 °C to +85 °C (-40 °F to +185 °F)

• Humidity Tolerance: 0% to 100% non-condensing

• Dimensions (H x W x D): 119.9 mm x 24.4 mm x 256.5 mm

• Weight: 0.34 kg (0.76 lbs)

Operational Features

• Phase Measurement Integration: Essential for determining the phase angle of vibration relative to a fixed shaft reference mark.

• Speed Monitoring: Provides real-time rotational speed data to the 3500 rack backplane and external control systems.

• Flexible Slot Allocation: Occupies a single half-height slot, allowing for high-density rack configurations.

• Dual-Channel Capability: Standard 3500/25 modules typically support two independent Keyphasor channels per module.