Product Short Description
- Product Name
- 4-Channel Dynamic Pressure Monitor Module for Bently Nevada 3500 Series Machinery Protection System
- Product Introduction
This module is a specialized dynamic pressure monitoring component engineered exclusively for Bently Nevada’s 3500 series machinery protection system. As a full-height module, it installs directly into the 3500 series rack and is designed to monitor dynamic pressure fluctuations in rotating and reciprocating machinery—critical for detecting faults such as cavitation, surge, combustion instability, and valve wear. It accepts input signals from piezoelectric pressure transducers and dynamic pressure sensors, converting raw analog data into actionable metrics including peak pressure, RMS pressure, and pressure waveform characteristics. The module integrates programmable alarm/trip functions, supports real-time data transmission to upper-level systems, and adheres to industrial standards such as API 670 and ISO 10816. It operates independently of the rack’s critical monitoring path while offering redundant configuration options, making it an indispensable component for safeguarding machinery reliability in pressure-sensitive industrial applications.
Description
- Technical Specifications
- Power Parameters: Operates on 24V DC power supply (tolerance ±10%), with a maximum power consumption of 10 watts. Draws a nominal current of 417mA at 24V DC, compatible with the 3500 series rack’s power distribution system.
- Input Configuration: Features 4 independent, isolated input channels. Each channel supports piezoelectric pressure transducers (IEPE) and dynamic pressure sensors with sensitivity ranges of 10 mV/bar to 100 mV/bar. Input voltage range: ±10V DC (peak-to-peak), input impedance: 100 kΩ.
- Measurement Capabilities:
- Frequency range: 0.1 Hz to 10 kHz (dynamic pressure), 0–1000 bar (static pressure range, compatible with sensor specifications)
- Measurement types: Peak pressure (positive/negative), RMS pressure, peak-to-peak pressure, pressure waveform capture
- Accuracy: ±0.5% of full scale, 24-bit ADC resolution for high-precision data conversion
- Output Performance: Provides 4 programmable 4–20mA analog outputs (1 per channel) and 8 relay outputs (2 per channel, configurable for alarm/trip). Relay contact rating: 30V DC/2A, 120V AC/1A. Supports waveform data output via Ethernet for post-fault analysis.
- Physical & Environmental Ratings: Dimensions of 241.3 mm (depth) × 24.4 mm (width) × 120.7 mm (height), net weight of 1.0 kg. Operating temperature range: -30°C to +65°C; storage temperature: -40°C to +85°C. Operates in 0–95% non-condensing humidity, IP20 protection rating (rack-mounted enclosure required).
- Compliance Standards: Meets API 670 (machinery protection), ISO 10816 (vibration/pressure measurement), IEC 61000-6-4 (electromagnetic compatibility), and CSA/NRTL/C Class I, Division 2 hazardous location certification.
- Function Features
- Specialized Dynamic Pressure Monitoring: Tailored for dynamic pressure measurement in rotating/reciprocating machinery, detecting subtle pressure fluctuations that indicate early-stage faults (e.g., pump cavitation, compressor surge, engine combustion instability).
- Multi-Sensor Compatibility: Supports piezoelectric pressure transducers and dynamic pressure sensors from Bently Nevada and third-party manufacturers, eliminating the need for signal converters and adapting to diverse application requirements.
- Programmable Alarm & Trip Logic: Each channel allows independent configuration of alarm (warning) and trip (danger) thresholds for peak pressure, RMS pressure, or pressure waveform deviation. Supports time-delayed triggers and latching/non-latching relay actions to prevent false alarms.
- Waveform Capture & Analysis: Captures high-resolution pressure waveforms (up to 10 kHz sampling rate) and stores them in non-volatile memory. Waveform data can be transmitted to System 1 software via Ethernet for detailed fault diagnosis and root-cause analysis.
- Redundant Configuration Support: Compatible with 3500 series triple modular redundancy (TMR) systems. Two modules can be paired for hot-standby operation, ensuring continuous pressure monitoring if one module fails.
- Seamless System Integration: Communicates with 3500 rack interface modules via the backplane, supporting Modbus TCP/IP, Ethernet/IP, and Profinet protocols. Integrates with System 1 software for remote monitoring, data trending, and predictive maintenance.
- Self-Diagnostic Capabilities: Built-in diagnostics monitor module hardware, sensor connections, and signal integrity. Front-panel LED indicators (Power OK, Channel Active, Alarm, Trip) and software-based fault codes enable rapid troubleshooting.
- Application Scenarios
- Power Generation Industry: Deployed in thermal, hydro, and nuclear power plants to monitor steam turbines (steam pressure fluctuations), feedwater pumps (cavitation detection), and boiler combustion systems (combustion instability). Triggers alarms to prevent equipment damage from pressure surges or cavitation.
- Oil & Gas Industry: Installed on offshore drilling rigs (drill string pressure monitoring), pipeline compressors (surge detection), and gas turbines (combustion chamber pressure). Withstands high vibration, temperature fluctuations, and corrosive environments, ensuring reliable monitoring during extraction and transportation.
- Petrochemical Industry: Used to monitor reciprocating compressors (cylinder pressure), reaction towers (process pressure fluctuations), and pumps (cavitation and pressure pulsation). Isolated input channels prevent ground loops, while hazardous location certification supports use in flammable/explosive zones.
- Marine & Naval Applications: Applied to ship propulsion systems (engine cylinder pressure), marine turbines (steam pressure), and auxiliary pumps (hydraulic pressure monitoring). The rugged design withstands salt fog, shock, and vibration, ensuring continuous protection during long voyages.
- Aerospace & Defense: Integrated into aircraft engine test benches and ground support equipment to monitor dynamic pressure in combustion chambers, fuel systems, and hydraulic circuits. Provides precise pressure data for performance validation and fault diagnosis.
- General Manufacturing (Heavy Machinery): Used in large industrial pumps, reciprocating compressors, and hydraulic systems to monitor pressure fluctuations. Detects faults such as valve wear, seal leakage, and cavitation, supporting predictive maintenance and reducing unplanned downtime.






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