Bently Nevada 125800-01 3500/25 Keyphasor I/O Module

Description

The Bently Nevada 125800-01 is an internal termination Keyphasor I/O module designed for use with the 3500/25 Enhanced Keyphasor Module within a 3500 Machinery Protection System rack. The 125800-01 receives input signals directly from proximity probes or magnetic pickups and delivers phase and speed timing signals to monitor modules across the rack system. Installed in a full-height rear slot, this non-isolated I/O module provides direct internal wiring terminal connections and rear buffered Keyphasor signal outputs for machine diagnostics and TSI monitoring applications.

Features

• Direct internal termination connections using Euro-style/screw terminal blocks for transducer field wiring
• Dual-channel transducer input handling for proximity probe and magnetic pickup signals
• Rear-panel buffered Keyphasor signal outputs via terminal headers
• Seamless integration with 3500/25 main half-height cards across legacy and current 3500 system racks

Applications

• Machinery protection systems requiring once-per-turn or multi-event timing reference signals
• Shaft rotative speed and phase angle (1X vibration amplitude/phase) tracking
• Turbine, compressor, and large rotating equipment condition monitoring

Technical Specifications

Connections/Interfaces

Installation Guidelines

• Rack Slot Placement: Mount the I/O module in the full-height rear slot directly behind the corresponding 3500/25 main half-height module position.
• Wiring & Shielding: Connect transducer field wiring to the internal terminal blocks (PWR, COM, KPH, SHLD). Ensure shield wires are properly landed at the assigned SHLD terminals to prevent signal noise.
• External Termination Compatibility: Do not attempt to connect External Termination (ET) blocks or cables to this internal termination module.

Compliance and Certifications

• EMC Directives: European Community Directive 2014/30/EU; Standards EN 61000-6-2, EN 61000-6-4
• Electrical Safety: European Community Directive 2014/35/EU; Standard EN 61010-1
• Hazardous Area (cNRTLus): Class I, Zone 2: AEx/Ex nA nC ic IIC T4 Gc; Class I, Zone 2: AEx/Ex ec nC ic IIC T4 Gc; Class I, Division 2, Groups A, B, C, and D (T4 @ Ta = -20 degC to +65 degC)
• Hazardous Area (ATEX/IECEx): Ex nA nC ic IIC T4 Gc; Ex ec nC ic IIC T4 Gc (T4 @ Ta = -20 degC to +65 degC)
• Maritime Approvals: DNV GL rules for classification (Ships, offshore units); ABS Rules for Condition of Classification Part 1
• Environmental Compliance: RoHS Directive 2011/65/EU; China RoHS SJ/T 11364-2024