Description

Bently Nevada 3500/40M 176449-01 Explosion-proof Intrinsically Safe Four-Channel Eddy Current Monitoring I/O Backplane (Rear Plate)

Basic Information
Brand: Bently Nevada
Model Definition
3500/40M: SIL2 compliant four-channel eddy current preamplifier monitoring front card (computational motherboard)
176449-01: Specialized I/O terminal back panel for the front card, with built-in intrinsic safety barriers (Intrinsic Safety Barriers)
Complete Set Unit = Front Card 125680-01 + Back Card 176449-01
Stock / Warranty: New original 12-month warranty, payment within 3 working days for shipment
Explosion-proof Certification: Ex nA IIC T4 Gc, Ex ia IIC T4, meeting explosion-proof zones of Petrochemical Zone 0/Zone 1, API670, IEC61508 SIL2 safety level
I. Core Hardware and Structure Description (Different from 135489-04 Core)
176449-01 Core Features: Integrated Safety Isolation Transformer
Each sensor circuit on the backplane is equipped with an isolated explosion-proof safety transformer, which can directly connect to the 3300XL eddy current probes in hazardous explosion-proof areas (petrochemical, oil and gas stations), limiting the circuit energy and preventing electric sparks from igniting flammable media.
135489-04 (the previous query model you entered): Ordinary standard terminal backplane, without safety transformer
Only applicable to ordinary non-explosion-proof central control cabinets. It is strictly prohibited to directly connect to explosion-proof site probes. An external safety transformer terminal must be added.

Hardware Structure
Split front and rear card architecture: The front card is responsible for signal processing and alarm logic; the rear card is responsible for on-site sensor wiring, explosion-proof isolation, 4–20mA analog output, and relay wiring
4 independent BNC eddy current probe input terminals, each channel is isolated by an independent safety transformer
European double-row terminal block: 4–20mA analog output, channel bypass, alarm dry contact, rack power supply
Size: 241.3×24.4×241.8mm, net weight approximately 0.91kg, standard 3500 rack slot hot-swappable
II. Electrical and Measurement Parameters (General Performance of Front Card 40M)
Channel Capacity: 4 independent eddy current sensor inputs, paired configuration (1+2 as one group, 3+4 as one group)
Compatible Sensors: 3300XL 8mm/11mm eddy current probes + preamplifier, input -2 to -24V gap voltage
Configurable Measurement Types
Radial shaft vibration, axial thrust displacement, rotor differential expansion, shaft eccentricity, REBAM rolling bearing metal wear monitoring
Sensitivity Options
3.94mV/μm (100mV/mil), 7.87mV/μm (200mV/mil); Special low sensitivity for differential expansion
Signal Bandwidth: 0.7Hz ~ 10kHz, built-in anti-aliasing filter, suppressing frequency converter, excitation interference
Alarm Logic: Each channel two-level threshold Alert warning + Danger shutdown, dangerous signal linkage system relay trip ESD
Power Consumption: Typical for the front and rear card set 7.7W, powered by the 3500 rack backplane
Environmental Parameters
Operating Temperature: -30℃ ~ +65℃ (explosion-proof limit 0~+65℃ stable operation)
Storage: -40℃ ~ +85℃; humidity 5%~95% RH no condensation
III. Exclusive Core Advantages of 176449-01
Integrated built-in explosion-proof transformer, simplifying explosion-proof system wiring
No need for additional external safety transformer terminal block, one backplane completes explosion-proof isolation, reducing cabinet wiring and reducing explosion-proof construction costs.
High and low voltage full circuit isolation
Sensor explosion-proof circuit, internal monitoring circuit, central control 4–20mA output three-way electrical isolation, withstand voltage 1000VDC, eliminating ground loop drift, jump count.
Split maintenance does not interrupt other measurement points
Only replace the faulty front card / rear card, the other 3 channels are normally monitored, the unit protection does not fail; supports hot-swappable with power on.
Complete fault self-diagnosis upload
Real-time detection of probe disconnection, preamplifier failure, safety transformer failure, circuit short circuit, fault codes uploaded through the rack bus to the 3500 gateway to DCS/SCADA.
Compliant explosion-proof scenarios
Standard for explosion-proof cabinets of natural gas, refining, chemical plants, replacing “ordinary backplane + external safety transformer” combination, reducing spare parts types.