Product Description

The Bently Nevada 81034-01 Keyphasor® Input Module provides a stable timing reference for advanced vibration analysis within the 3500 Machinery Protection System. Each once-per-turn pulse enables accurate phase, speed, and order tracking, which supports deeper diagnostics during machinery operation. In addition, its dual-channel architecture allows facilities to monitor redundant signals, helping engineers enhance overall system reliability.

This module processes signals from proximity probes or compatible digital sources and delivers clean TTL-level outputs for the 3500 rack. Moreover, its rapid signal conditioning ensures that the machinery protection system responds quickly to changes in shaft behavior. The 81034-01 is widely used by reliability teams managing turbines, compressors, pumps, and heavy rotating assets where precise phase information is essential.

Technical Specifications

General
Model Number: 81034-01
Series: Bently Nevada 3500
Module Type: Dual-Channel Keyphasor® Input Module
Function: Phase reference, speed measurement, order tracking

Inputs & Outputs
Number of Channels: 2 independent Keyphasor® inputs
Input Types: Proximity probe Keyphasor® or TTL-compatible signals
Output Signal: TTL-compatible conditioned pulse

Electrical & Integration
Power Supply: From 3500 rack backplane
Rack Interface: Standard 3500 backplane communication

Environmental
Operating Temperature: –30 °C to +65 °C
Storage Temperature: –40 °C to +85 °C
Humidity: 5%–95% non-condensing
Weight: 500 g

Additional Information
Part Number: PWA-81034-01
Category: Machine Parts / Assembly for Machine
Country of Origin: USA

FAQ

Q1: What does a Keyphasor® module do in the 3500 system?
It generates a precise once-per-turn reference used to calculate phase, speed, and order-related vibration parameters.

Q2: Can the 81034-01 work with proximity probes?
Yes. It accepts non-contact Keyphasor® probes as well as compatible TTL digital inputs.

Q3: How many channels does the module support?
It features two independent channels for redundant or dual-probe configurations.

Q4: Is this module suitable for high-temperature environments?
Yes. It operates reliably across a wide –30 °C to +65 °C temperature range.

Q5: Does it require an external power supply?
No. Power is provided directly through the Bently Nevada 3500 rack backplane.