Description
I. Product Overview
Bently Nevada 3500/65 (Part No.172109-01) is a 16-channel rack-mounted high-precision temperature monitor module for the 3500 machinery protection system, complying with API 670 industrial rotating machinery safety standards. It is used for continuous temperature monitoring, over-limit alarm and safety interlock protection of bearing, motor winding, lubricating oil and process medium for turbines, compressors, large fans and pumps.
II. Hardware Structure and Composition
1. 16-channel High-precision Signal Acquisition Unit
Each channel adopts isolated circuit and 24-bit ADC with input impedance over 1MΩ, compatible with E/J/K/T thermocouples and 100Ω 3/4-wire RTDs. Built-in low-pass hardware filter suppresses industrial electromagnetic interference, and real-time sensor loop fault detection prevents false temperature alarms caused by line abnormality.
2. Redundant Backplane Bus Communication Unit
Dedicated high-speed rack backplane bus realizes bidirectional transmission of temperature data, alarm status and fault diagnostic information, supporting online hot-swap of the module without interrupting the safety interlock of other channels during maintenance.
3. Status Indication & Bypass Control Unit
Three front-panel LEDs indicate module health, bus communication and channel bypass status. The bypass function allows temporary shielding of alarm interlock during sensor calibration and on-site maintenance to avoid accidental unit shutdown.
4. Low-power Isolated Power & Industrial Protection Unit
Supplied by rack backplane with typical power consumption of 3W, equipped with multi-level surge and overcurrent protection. The three-proof coated PCB and reinforced metal structure adapt to harsh cabinet environments, and TMR triple redundant voting architecture eliminates single-point safety failure risk.
5. Standard Rack Plug-in Mounting Unit
Single-slot installation compatible with all 3500 series modules, supporting direct in-situ replacement of faulty cards without cabinet and wiring modification, realizing rapid commissioning after parameter configuration import.
III. Technical Specifications
(1) Electrical Parameters
- Power Supply: Rack backplane DC power supply, typical power consumption 3W
- Input Channels: 16 isolated temperature channels, mixed TC/RTD configurable
- Supported Sensors: Type E/J/K/T isolated thermocouple, 100Ω 3/4-wire Pt RTD
- Input Impedance: ＞1MΩ per channel, built-in hardware anti-interference filter
- Measurement Accuracy: ±0.1℃ for RTD, ±0.5℃ for thermocouple
- Safety Mode: TMR triple modular redundancy, SIL2 functional safety certified
- Functions: Independent dual-threshold alarm, sensor fault diagnosis, channel bypass, hot-swap support
- Communication: 3500 proprietary redundant backplane high-speed bus
(2) Environmental Parameters
- Operating Temperature: -30℃～+65℃; Storage Temperature: -40℃～+85℃
- Relative Humidity: 5%～95%RH, non-condensing, no corrosive gas or conductive dust
- Ingress Protection: IP20, installed only in indoor ventilated control cabinets
(3) Mechanical Parameters
- Mounting: Standard 3500 rack single-slot plug-in installation
- Net Weight: Approx. 0.38kg
- Protection Process: Metal reinforced housing, three-proof conformal coated anti-vibration PCB
- Redundancy Scheme: Triple adjacent slot installation for TMR voting
- Origin: United States
IV. Product Functions and Features
1. 16-channel Integrated Temperature Collection Optimizes Cabinet Hardware Layout
Mixed sensor access and independent channel configuration reduce the number of installed modules, simplify field wiring, and lower hardware investment and routine maintenance costs for multi-point temperature monitoring of large units.
2. Dual-threshold Alarm & Full-loop Sensor Diagnosis Guarantees Unit Safety
Independent alert and danger interlock logic prevents equipment burnout and unplanned shutdown caused by over-temperature; real-time sensor fault detection avoids protection failure due to measuring circuit abnormality.
3. TMR Triple Redundant Architecture Meets High-level Safety Specifications
2-out-of-3 hardware voting ensures uninterrupted temperature monitoring and safety interlock under single-module failure, fully satisfying SIL2 and API 670 safety requirements for core rotating equipment.
4. Hot-swap & Channel Bypass Reduce Maintenance Production Loss
Faulty modules can be replaced online without system shutdown; the bypass function ensures safe on-site sensor calibration and circuit maintenance by temporarily shielding alarm output.
5. Standard Configuration Compatible with Predictive Maintenance Platform
Temperature historical trends and fault logs can be uploaded to DCS, SCADA and System 1 software to realize equipment degradation analysis, shifting maintenance mode from breakdown repair to predictive inspection.
6. Rugged Wide-temperature Design Ensures Long-term Stable Operation
Fanless passive heat dissipation and industrial three-proof structure adapt to harsh cabinet environments with low failure rate, only requiring regular inspection and periodic precision calibration for 24/7 continuous industrial operation.
V. Application Scenarios
- Bearing, lubricating oil and motor winding temperature safety interlock monitoring for turbine units and auxiliary fans/pumps in thermal, gas and hydropower plants.
- High-risk process equipment temperature protection for centrifugal and reciprocating compressors in petrochemical, LNG and coal chemical facilities.
- Intelligent upgrading and measuring point expansion of legacy temperature monitoring instruments for fans and reducers in metallurgy, papermaking and cement industries.
- TMR redundant safety system construction for key rotating machinery complying with API 670 and SIL2 specifications.
- Spare part replacement and data acquisition supporting for existing Bently 3500 rack monitoring systems and predictive maintenance platforms.
