Description
Bently Nevada 172109‑01 Barrier‑Type Internal Termination I/O Assembly
Product Overview
172109‑01 is the intrinsically‑safe barrier‑integrated internal‑termination I/O accessory for 3500/65 (145988‑02) 16‑Channel Temperature Monitor in Bently Nevada 3500 machinery‑protection system. Unlike standard 172103‑01 non‑barrier internal termination unit, this assembly integrates built‑in safety barriers for hazardous‑area field sensors. It receives RTD and isolated‑tip thermocouple signals from explosive‑hazard zones, provides galvanic safety isolation, and transmits conditioned signals to the 3500/65 main monitor board via rack backplane. It cannot operate independently and must be installed behind 145988‑02 within the same rack slot to constitute complete 3500/65 monitor set for hazardous location deployment.
Technical Specifications
| Item | Parameter |
|---|---|
| Part Number | 172109‑01 |
| Matching Main Board | 3500/65 (145988‑02) 16‑Channel Temperature Monitor |
| Termination Style | Internal Termination with integrated intrinsic‑safety barrier |
| Channels | 16 temperature input channels |
| Supported Sensors | 3‑wire /4‑wire Pt100, Ni RTD; Isolated‑tip Thermocouple Type E/J/K/T |
| Hazardous Area Compliance | Intrinsic safety barrier for field instruments installed in Class I Div 2 / ATEX hazardous zones |
| Power Supply | Powered through 3500 rack backplane bus |
| Typical Power Consumption | 1.8 W |
| Operating Temperature | ‑30 ℃ ~ +65 ℃ (rack); Storage:‑40 ℃ ~ +85 ℃ |
| Form Factor | Single‑slot plug‑in for standard 3500 instrument rack |
| Weight | Approx. 0.48 kg |
| Compliance | API 670, compatible with TMR triple‑modular‑redundancy architecture |
| Installation | Mounted directly behind 145988‑02 main monitor in identical rack slot |
Key Features
- Built‑in intrinsic safety barrier: Eliminates external separate safety barrier modules; permits direct connection to temperature sensors mounted inside hazardous explosive zones, simplifies cabinet layout for oil‑gas and petrochemical hazardous‑location projects.
- Internal termination design: Field sensor cables connect directly to rear‑rack screw terminals; no intermediate jumper cables needed.
- 16‑channel mixed‑sensor support: Each channel independently configurable for RTD or isolated‑tip thermocouple, mixed sensor types allowed within single module.
- Full transducer loop supervision: Enables main 3500/65 board to detect open‑circuit, short‑circuit and sensor loop fault conditions.
- TMR system compatible: Supports triple modular redundant configuration for high‑safety machinery‑protection applications.
- Configuration‑transparent hardware: No standalone software setup; all sensor parameters, alarm thresholds and delta‑temperature settings are configured in 3500 Rack Configuration Software for paired 3500/65 monitor.
- Hot‑swap capability: Supports online replacement following official Bently maintenance procedure.
Key comparison with related I/O assemblies
- 172109‑01: Internal termination + integrated IS barrier, for hazardous‑area sensors.
- 172103‑01: Standard internal termination, no barrier, only for safe‑area field sensors.
- 172110‑01: External termination, requires remote terminal blocks, suitable for pre‑wired cabinet projects.
172109-01
Typical Applications & Application Scenarios
Main Applications
- Signal interface for RTD / isolated‑tip thermocouple sensors located in hazardous explosive zones, paired with 3500/65 monitor.
- Monitor bearing metal temperature, lube‑oil temperature, compressor suction/discharge temperature, motor winding temperature for machinery protection and predictive maintenance.
- Deliver temperature data for absolute‑value alarm, differential‑temperature calculation, machinery trip logic and trending analysis.
Industry Scenarios
- Oil & gas: offshore platforms, refineries, natural‑gas compressor stations with ATEX / Class I Div 2 hazardous classified zones.
- Petrochemical plants: hydrogen compressors, process turbo‑machinery in explosive‑gas environment.
- Power generation: chemical‑fuel power plants with hazardous process sections.
- Safety‑critical sites complying with API 670, requiring intrinsic‑safety protection for field temperature instruments.
Supporting / Matching Components
- Mandatory paired main monitor: 145988‑02 (3500/65) 16‑Channel Temperature Monitor, cannot work standalone.
- Host rack: 3500/05 instrument rack.
- Rack power supply: 3500/15 series power‑supply modules.
- Field devices: Intrinsically‑safe certified RTD and isolated‑tip thermocouple sensors, shielded intrinsically‑safe field cables.
- Auxiliary modules:
- 3500/32M / 3500/33 relay modules: hardware alarm & trip contact output.
- 3500/92 / 3500/77M gateway modules: upload temperature and alarm data to DCS, SCADA or System 1 platform.
- Configuration software: Bently Nevada 3500 Rack Configuration Software.
Related & Reference Part Numbers
- 145988‑02: 3500/65 main monitor board
- 172103‑01: Non‑barrier internal‑termination I/O (safe‑area only)
- 172110‑01: External‑termination I/O assembly
- 3500/65‑01‑02: Complete unit (145988‑02 + 172109‑01 barrier‑type internal termination)
Installation & Maintenance Notes
- 172109‑01 must install behind 145988‑02 in same rack slot; barrier‑type I/O cannot mix‑use with non‑barrier internal termination for one monitor set.
- Only connect IS‑certified field sensors and cables to this assembly; strictly follow hazardous‑area installation codes.
- Separate intrinsically‑safe signal wiring from high‑voltage non‑IS cables to avoid interference.
- After installation, verify channel health status, sensor fault detection and alarm logic in 3500 configuration software.
- For TMR setup, three full 3500/65 assemblies must occupy physically adjacent rack slots.
- Execute hot‑swap replacement strictly per Bently Nevada official service manual.
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