Description
Bently 3500/42M‑01‑00 140734‑02
Technical Specifications Number of input channels: 4 independent configurable channels Supported transducer type: 3300XL proximitor system, velocity seismic sensor, acceleration seismic sensor Transducer power supply: ‑17.5 Vdc ~ ‑26 Vdc for proximitor; constant current excitation for seismic sensors Frequency response range: 0.5 Hz ~ 15000 Hz Measurement accuracy: ±1% full scale Power consumption: 8 W typical value, maximum 10 W Operating temperature: ‑40 ℃ ~ +70 ℃ Storage temperature: ‑40 ℃ ~ +85 ℃ Relative humidity: 5%‑95% RH, non‑condensing Shock resistance: 50 g peak value Vibration resistance: 10‑2000 Hz, 10 g peak value Backplane communication: 3500 proprietary system bus Module dimension: 241.3 mm × 24.4 mm × 241.8 mm Weight: 0.91 kg Compliance standard: API‑670, CE certification
Functional Features Each of four channels can be independently configured as proximitor input or seismic sensor input. Built‑in digital integration function converts acceleration signal to velocity value. Dual‑level Alert and Danger programmable alarm setpoints, configurable alarm hysteresis and delay time. Front‑panel LED indicators for channel health, alarm status and module operating state. Buffered raw transducer signal output for external oscilloscope and fault diagnosis instruments. Supports simplex, dual redundant and TMR triple modular redundant configuration modes. All measurement parameters and alarm thresholds downloaded by 3500 configuration software. Upload real‑time trend and waveform data to System‑1 machinery diagnostic software. Output alarm logic signal to 3500 relay modules for machinery trip protection. External termination version uses rear terminal block for sensor wiring. Hot‑swap supported under normal rack power supply.
Application Scenarios Relative shaft vibration and absolute casing vibration monitoring for steam turbine and gas turbine. Axial thrust displacement and eccentricity measurement for centrifugal compressors. Casing vibration monitoring for large fans, blowers and pump units. Vibration monitoring for gear box and turbo‑generator set. Combined proximitor and seismic sensor mixed measurement for power plant and petrochemical units. Machinery protection system installed in non‑hazardous industrial area. Cooperate with 3500 rack communication, relay and redundant power modules.
Performance Parameters Proximitor input impedance: 550 Ω Seismic sensor excitation current: constant current 4 mA Sampling rate: continuous 256 samples per channel, transient sampling up to 100000 samples per second Alarm response delay: less than 250 ms Measurement resolution: 0.1 μm for displacement; 0.01 mm/s for velocity Channel‑to‑channel crosstalk: less than 0.1% full scale MTBF value: more than 330000 hours under normal industrial environment
Material Composition Front panel: blue coated metal panel with silk‑screen printing and LED indicator window. Main circuit board: multi‑layer FR‑4 high‑temperature resistant printed circuit board. Electronic components: industrial grade high‑precision ADC, FPGA digital processing chip, signal conditioning analog components. Module housing: aluminum alloy electromagnetic shielding shell. Locking mechanism: stainless steel rack insertion latches. Connector: gold‑plated backplane connector and gold‑plated external termination terminal block.
Structural Features Standard single‑slot plug‑in module for 3500 instrument rack. Front‑panel LED status indicator group and pull‑out latch mechanism. Rear side gold‑plated multi‑pin backplane connector for power supply and system bus communication. External termination version routes all sensor signal wiring to rear terminal block without internal barrier circuit. Internal metal shielding shell separates analog signal area and digital logic area. Circuit layout isolates proximitor signal circuit and seismic signal circuit.
Working Principle When channel configured for proximitor input: eddy‑current gap voltage signal enters conditioning circuit, ADC converts analog voltage to digital value, digital unit completes linear correction and engineering conversion. When channel configured for seismic sensor input: constant‑current excitation is supplied to velocity or acceleration sensor, sensor output analog signal is sampled by ADC chip. Built‑in digital integration algorithm converts acceleration signal to velocity value. Calculated measurement value compares with pre‑programmed Alert and Danger thresholds. Alarm flag is generated when value exceeds threshold and sent to system bus and relay module. Real‑time measurement and waveform data is uploaded through rack backplane bus to upper‑level configuration and diagnostic software. Buffered raw analog signal is output for external diagnosis equipment.
