Product Description

Overview

The Bently Nevada 177897-01 is a high-performance Velomitor Piezo-Velocity Sensor with an integrated display interface module, part of the 330500 series seismic monitoring family. It provides precise measurement of absolute casing, bearing housing, or structural vibration, converting mechanical motion into velocity-proportional electrical signals.

This variant is designed with specialized mounting or connector configurations, offering flexible installation options including integral cable or specific stud threading for machinery monitoring in industrial and hazardous environments.

Sensor Description

The 177897-01 employs a solid-state piezoelectric element with an integrated electronic circuit to convert acceleration into a velocity signal, eliminating moving parts and improving reliability. The hermetically sealed 316L stainless steel housing ensures durability in harsh conditions, including high temperatures, oil mist, and corrosive atmospheres.

Performance Characteristics

Velocity Measurement

• Sensitivity: 100 mV/in/s (3.94 mV/mm/s)

• Frequency Response: 4.5 Hz to 5 kHz

• Linear Output: ±5% across amplitude and frequency range

• Peak Velocity: Up to 50 in/s (1270 mm/s)

Electrical Features

• Two-wire constant-current interface compatible with 3500/42M, 3500/44M, and Trendmaster systems

• Electrical isolation prevents ground loops

• On-chip integration reduces noise and signal degradation

Environmental and Mechanical Limits

• Operating Temperature: -40°C to +121°C (-40°F to +250°F)

• Shock Resistance: Withstands up to 5000 g peak

• Hermetically sealed, 316L stainless steel construction

Display Interface Module

The 177897-01 also functions as a touchscreen interface for Bently Nevada 3500 monitoring systems. It enables direct visualization of vibration and alarm data at the machinery location.

• Display Type: VGA TFT LCD with resistive touchscreen

• Resolution: 640 × 480 pixels

• Power Consumption: 5.6 W (display unit), 15.5 W system total

• Mounting: Front panel, 19-inch EIA rack, or standalone

• Weight: 0.55 kg

• Operating Temperature: 0°C to +50°C; Storage: -20°C to +70°C

• Supports up to two displays per 3500 chassis

Applications

• Absolute casing vibration monitoring on motors, pumps, fans

• Early and late-stage rolling element bearing failure detection

• Slow to medium-speed rotating machinery where shaft proximity probes cannot be installed

• Hazardous area monitoring with agency-approved mounting options

FAQ

Q: What does the “01” suffix indicate?
A: It usually specifies the mounting stud type or agency approval certification for hazardous areas.

Q: Can this sensor connect directly to 3500 Series monitors?
A: Yes, it is compatible with 3500/42M, 3500/44M, and Trendmaster systems.

Q: Can it handle industrial shocks and temperature extremes?
A: Yes, it is hermetically sealed, rated for -40°C to +121°C, and can withstand shocks up to 5000 g.