Description
Bently Nevada 3500/65 (145988‑02) 16‑Channel Temperature Monitor
350065 145988-02
Product Overview
145988‑02 is the main monitor board part number for the 3500/65 16‑Channel Temperature Monitor, a single‑slot module within Bently Nevada 3500 machinery protection system. This high‑density temperature acquisition module accepts RTD and isolated‑tip thermocouple inputs, performs signal conditioning, temperature calculation, alarm comparison and sensor fault diagnostics. It delivers thermal condition data for rotating and reciprocating machinery, complies with API 670 for machinery protection, and supports TMR redundant deployment for high‑safety plant sitesBaker Hugh…. It can pair with internal‑termination or external‑termination I/O assemblies according to cabinet‑wiring requirements.
Technical Specifications
| Item | Parameter |
|---|---|
| Part Number | 145988‑02 (3500/65 Main Monitor Board) |
| Channel Count | 16 independent temperature input channels |
| Supported Sensors | 3‑wire / 4‑wire RTD (Pt100, Ni types); Isolated‑tip Thermocouple (Type E, J, K, T)；mixed RTD+TC per‑channel configurable |
| Input Impedance | ＞1 MΩ per channel leadBaker Hugh… |
| Power Consumption | Nominal 3 W, supplied via rack backplane busBaker Hugh… |
| Operating Temperature | ‑30 ℃ ~ +65 ℃ (rack environment); Storage:‑40 ℃ ~ +85 ℃ |
| Form Factor | Single‑slot plug‑in for 3500 instrument rack |
| Weight | Approx. 0.91 kg |
| Front‑panel Indicators | OK, Bypass, Channel alarm status LED indicators |
| Configuration Tool | 3500 Rack Configuration Software; per‑channel alarm / danger setpoints, sensor type, temperature‑difference calculation configurable |
| System Compliance | API 670, SIL‑capable when deployed within qualified 3500 system; supports TMR voting architecture |
| Termination Options | Works with internal termination I/O or external termination I/O assemblies |
Key Features
- High‑density 16‑channel multi‑sensor support: Each channel can independently configure for RTD or isolated‑tip thermocouple, mixed sensor types allowed within one module, reduces rack slot consumption for multi‑point thermal monitoring.
- Temperature & differential temperature monitoring: Supports absolute‑temperature and delta‑temperature calculation between selected channels for bearing‑temperature‑rise supervision.
- Full sensor fault supervision: Detects transducer open‑circuit, short‑circuit and abnormal sensor loop conditions, reports diagnostic status over rack backplane bus.
- TMR triple modular redundancy capability: Three adjacent 3500/65 modules can form TMR group with dual‑voting logic, eliminates single‑point failure for safety‑critical machinery protection applicationsBaker Hugh….
- Seamless 3500 rack integration: Interoperates with relay modules, communication gateways and other monitor modules over backplane digital bus; supports hot‑swap replacement following official maintenance procedure.
- Two termination architectures available: Select internal termination for direct rear‑rack field wiring, or external termination for cabinet pre‑wiring and high‑EMI environment projects.
- Data for predictive maintenance: Upload temperature trending and alarm events to System 1 software, DCS, SCADA for equipment health analysis.
350065 145988-02
Typical Applications & Application Scenarios
Main Applications
- Bearing metal temperature monitoring for gas turbine, steam turbine, centrifugal compressor, gearbox and large motor/generator.
- Stator winding temperature monitoring for generators and high‑voltage motors.
- Compressor suction‑side / discharge‑side process temperature measurement.
- Monitor lube‑oil inlet & outlet temperature, detect abnormal thermal rise of rotating components.
- Provide thermal alarm inputs for machinery protection logic and predictive‑maintenance trending.
Industry Scenarios
- Power generation: combined‑cycle power plants, steam turbine power units, large generator sets.
- Oil & gas: refinery turbo‑machinery, natural‑gas pipeline compressors, reciprocating compressor stations.
- Petrochemical plants: process compressors, turbo‑expanders, critical rotating equipment per API 670 requirements.
- SIL‑qualified machinery‑protection sites requiring TMR redundant monitoring architecture.
Supporting / Matching Components
- I/O Termination assemblies (must pair with main board 145988‑02)
- 172109‑01: Internal‑termination I/O assembly; field sensor cables connect directly to rack rear terminals.
- 172110‑01: External‑termination I/O assembly; requires interconnection cables plus remote external terminal blocks.
- Host rack: 3500/05 instrument rack.
- Rack power supply: 3500/15 series power‑supply modules.
- Field sensors: RTD Pt100 / Ni sensors, isolated‑tip thermocouples and shielded sensor cables.
- External terminal blocks: Matching external termination blocks for 172110‑01 ET setup.
- Interconnection jumper cables: Custom‑length flat cables for external termination wiring path.
- Auxiliary modules:
- 3500/32M / 3500/33 relay modules: hardware alarm contact output.
- 3500/92 / 3500/77M gateway modules: upload temperature data & alarms to DCS / SCADA / System 1.
- Configuration software: Bently Nevada 3500 Rack Configuration Software.
Related & Reference Part Numbers
- 145988‑02: 3500/65 main monitor board
- 172109‑01: Internal termination I/O for 3500/65
- 172110‑01: External termination I/O for 3500/65
- 3500/61: 6‑channel temperature monitor module, with local 4‑20 mA recorder outputs per channel (alternative selection)Baker Hugh…
Difference note:
- 3500/65 (145988‑02): 16‑channel high‑density temperature monitor, no native 4‑20 mA recorder output.
- 3500/61: 6‑channel temperature monitor, equipped with per‑channel 4‑20 mA analog recorder outputs.
Installation & Maintenance Notes
- The main monitor board (145988‑02) must install together with corresponding I/O termination assembly inside the identical rack slot, cannot operate standalone.
- When building TMR configuration, three 3500/65 monitors must occupy three physically adjacent rack slots to enable voting functionBaker Hugh….
- Use shielded twisted‑pair sensor cables; separate temperature‑signal wiring from high‑power cables to reduce measurement noise.
- After hardware installation, validate channel status, sensor fault‑detection and alarm threshold function in 3500 configuration software.
- Hot‑swap replacement is permitted; strictly follow Bently Nevada official service manual during powered‑on maintenance.
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