Bently Nevada 135489/02 (3500/42M) Displacement & Vibration Monitoring Module

I. Model Basic Information
Full part number: 135489-02 (abbreviation 135489/02)
Corresponding front card model: 3500/42M Proximitor Seismic Monitor
Brand: Bently Nevada (Baker Hughes)
Product Positioning: 4-channel shaft displacement / shaft vibration / casing vibration integrated monitoring I/O back card, with built-in intrinsically safe isolation barrier, used for 3500 TSI unit protection system
Version Description: The suffix 02 represents the hardware Rev.02, the mainstream in-use replacement version, compatible with the entire 3500 rack series

Channel Allocation (Pair Configuration)
The channels are divided into two groups, and the software freely defines the monitoring type:
Channel 1, 2: Compatible with 3300XL eddy current probe → Core for shaft displacement monitoring (thrust bearing axial displacement, differential expansion, radial shaft vibration, eccentricity)
Channel 3, 4: Compatible with Velomitor speed sensor / acceleration sensor → Casing vibration velocity, acceleration monitoring
A single module simultaneously covers shaft system displacement protection + casing vibration protection, standard card for steam turbine units

Core Displacement Monitoring Function (Key Points)
Axial thrust displacement (Thrust Position)
Monitor thrust disk movement to prevent bearing wear, with Alert warning and Danger shutdown interlock settings;
Radial shaft vibration (Radial Vibration)
Eddy current probe collects the peak value of shaft relative vibration;
Differential expansion (Differential Expansion)
Monitoring the thermal expansion difference between the turbine rotor and the cylinder;
Axial eccentricity, roundness range (REBAM)
Judgment of shaft rotation and start-stop eccentricity to avoid thermal bending damage to the unit

Hardware Electrical Specifications
Power Supply: 24VDC on the back panel of the 3500 rack, total power consumption ≈ 7W
Isolation: 1000VAC optical isolation between channels, built-in zener safety barrier, can directly connect to explosion-proof probes without external isolation barrier
Size: 241.3×24.4×241.8mm, standard full-height slot, supports hot-swappable while powered on
Weight: 0.91kg
Operating Temperature Range: -30℃ ~ +65℃, Storage: -40℃ ~ +85℃, 0~95% RH without condensation
Standards: Compliant with API 670 Rotating Machinery Protection Specifications, CE/CSA Industrial Certification

Signal Input and Output Input
1/2 channel: Receives signals from the 3300/3300XL preamplifiers (-24 to +24 VDC)
3/4 channel: Speed / acceleration piezoelectric sensor signals
Built-in Sensor OK loop diagnosis: If the probe breaks wire, shorts out, or the preamplifier malfunctions, it directly reports the channel failure and locks the machine for protection. Output
Each channel has independent 4–20mA analog quantity, uploading to DCS/PLC to display the real-time values of displacement and vibration.
4 BNC buffered outputs: external oscilloscope for waveform acquisition, spectrum analysis
Global fault passive relay contacts: alarm for module abnormalities, channel faults through hard contacts
Backplane bus communication: communication with 3500/22M, 3500/92 gateways, uploading System 1 status monitoring software