Description
Bently‑Nevada 136294‑01 Rear I/O Board (for 3500/62 Process Variable Monitor)
Product Description
The 136294‑01 is an isolated rear internal‑termination I/O daughter‑board exclusively designed for Bently‑Nevada 3500/62 six‑channel Process Variable Monitor, corresponding to model variant 3500/62‑03‑00Baker Hugh…. It mates with front CPU board 163179‑03 to constitute a complete monitor assembly.
This rear board provides isolated +4‑20 mA signal interfaces with internal screw‑type terminals for direct field wiring inside the 3500 rack. It delivers galvanic isolation between field transmitters and monitor circuitry, suppresses ground‑loop interference, and routes analog process signals to front‑end processing circuits. It supports simplex and TMR triple‑modular‑redundant protection configurations. Hot‑swap is permitted while rack remains powered on. OEM production discontinued; supplied as aftermarket spare part for legacy turbomachinery TSI racks.
Part Number Breakdown‑ 136294‑01：Isolated +4‑20 mA I/O Module with internal screw terminations (rear board)‑ Matching front monitor board：163179‑03‑ Complete assembly model：3500/62‑03‑00‑ No third‑party safety certification
136294-01
Technical Specifications
| Item | Specification |
|---|---|
| Part Number | 136294‑01 |
| Product Type | Rear Isolated I/O Termination Board |
| Applicable Monitor | 3500/62 Process Variable Monitor |
| Supported Input Signal | Isolated +4‑20 mA analog current input per channel |
| Channel Count | 6 channels, channel‑wise galvanic isolation |
| Isolation Rating | 500 V channel‑to‑backplane isolation |
| Termination Style | Internal screw terminals, direct rack‑internal field wiring |
| Hot‑swap Support | Yes, rear‑board hot‑swap under rack powered‑on |
| Physical Dimension(H×W×D) | 241.3 mm ×24.4 mm ×99.1 mm (9.50 in ×0.96 in ×3.90 in) |
| Weight | 0.20 kg (0.44 lb) |
| Operating Temperature | ‑30 °C ~ +65 °C (‑22 °F ~ +149 °F) |
| Storage Temperature | ‑40 °C ~ +85 °C (‑40 °F ~ +185 °F) |
| Relative Humidity | 5‑95 % RH, non‑condensing |
| Product Status | Discontinued OEM production, aftermarket spare‑part only |
Variant note for 3500/62 rear I/O options‑136294‑01：Isolated 4‑20 mA, internal screw termination (this unit)‑136491‑01：‑10 ~ +10 VDC voltage I/O, internal termination‑136483‑01：Isolated 4‑20 mA, external termination, requires separate terminal block cable setBaker Hugh…
Key Features & Benefits
- 6‑channel galvanic‑isolated 4‑20 mA interface: Provides electrical isolation for each analog input channel, eliminates ground‑loop noise and improves measurement stability for pressure, flow, temperature and level transmitters.
- Internal screw‑terminal termination: Field sensor cables connect directly onto rear‑board screw terminals inside rack cabinet; no external termination block or extension cable required, simplifies cabinet wiring layout.
- Rear‑side hot‑swap capability: The I/O board can be replaced online without rack power‑down, reduces system downtime during maintenance.
- Full compatibility with simplex / TMR architecture: Works for single‑channel simplex monitoring; also supports three‑module TMR 2‑out‑of‑3 voting setup for safety‑critical machinery‑protection applicationsBaker Hugh….
- Seamless front‑rear mechanical‑electrical matching: Must pair with front CPU board 163179‑03; mismatched front‑rear combination will lead to hardware malfunction or measurement failure.
- Backward‑compatible with full 3500 ecosystem: Cooperates with 3500/15 redundant power supply, 3500/22‑TDI gateway, 3500/33 relay‑output module and 3500 configuration software.
Application Fields
‑ Power‑generation, petrochemical & natural‑gas plants: rear signal‑interface component for 3500/62 process‑variable monitor, collects 4‑20 mA transmitter signals from turbomachinery auxiliary systems (steam‑turbine, gas‑turbine, centrifugal compressor).‑ Sites adopting internal rack wiring scheme, preferring no external termination accessories.‑ Spare‑part replacement & retrofit for existing 3500 racks originally equipped with 3500/62‑03‑00 (163179‑03+136294‑01) assembly.
Related Recommended Products
‑ 163179‑03: Matching front‑side 3500/62 monitor CPU processing board‑ 3500/05 series: 3500‑system rack chassis‑ 3500/15 series: Redundant rack power‑supply modules‑ 3500/22 / 3500/22M TDI: Transient‑data‑interface gateway for configuration download and event‑log reading‑ 3500/33‑01‑00: Relay‑output module for hard‑wire alarm dry‑contact output‑ 3500 Rack Configuration Software: For channel scaling, alert/danger setpoint and TMR‑mode parameter setup
Installation and Maintenance
Installation
- Firmly mate rear I/O board 136294‑01 with matched front‑side monitor board 163179‑03 to complete the full 3500/62‑03‑00 assembly; insert into any full‑height slot of 3500 rack. For TMR application, install three complete assemblies on adjacent slots.
- Route field 4‑20 mA transmitter cables to rear‑board screw terminals, strictly comply with instrument wiring specifications and isolation earthing requirements.
- Configure monitor via TDI and 3500 Rack Configuration Software; set channel input type, engineering scaling and alarm thresholds, download configuration to rack.
- Power‑up rack; verify front‑panel module OK‑LED status; check rack event‑log for input‑channel faults or hardware alarms, validate analog measurement reading.
Important Note: Only rear‑side 136294‑01 supports hot‑swap. Front processing board replacement requires slot power‑off. Mismatched front‑rear PN combination will cause abnormal operation.
Maintenance
- Routine inspection: check rear‑board screw terminals for dust, corrosion and loose wiring connections.
- Download rack event‑log periodically to view transmitter faults, channel over‑range and hardware diagnostic records.
- When rear‑I/O circuit failure occurs, perform hot‑swap replacement for 136294‑01 under rack powered‑on state; verify each channel measurement function after replacement.
- Avoid mechanical shock and conductive contamination during module‑handling. Refer to Bently‑Nevada official document Doc‑141541 (3500/62 Process Variable Monitor Datasheet & Operation Manual) for full installation constraints and troubleshooting guidanceBaker Hugh…。
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