Product Core Brief
- Model: 136703‑01
- Brand: BENTLY
- Series: 3500 Machinery Protection System
- Core Function: Captures keyphasor / tachometer signals for speed, phase and overspeed protection on rotating machinery.
- Product Type: Dual‑Channel Keyphasor I/O Module
- Key Specs: 24‑68 kHz input bandwidth | Built‑in internal barriers | Internal field termination ⚠️ EOL — limited stock remaining
BENTLY 135489‑04
Product Introduction
BENTLY 136703‑01 fits inside the 3500 rack to process pulse signals from magnetic pickups and proximity probes. It delivers phase reference and rotational‑speed data for turbine and compressor protection.
Compared to non‑barrier variants, this unit carries intrinsic safety barriers for hazardous zone wiring. It supports input frequencies up to 68 kHz, suitable for high‑speed turbo‑machinery —though your mileage may vary with heavily noisy field cables.
Key Technical Specifications
| Parameter | Value |
|---|---|
| Channel Count | 2 keyphasor / tachometer input channels |
| Input Frequency Range | 24 kHz to 68 kHz |
| Input Voltage Range | 0‑55 VDC peak |
| Safety Feature | Integrated intrinsic safety internal barriers |
| Termination Style | Internal termination, no external barrier needed |
| Operating Ambient Temperature | ‑40 °C to +70 °C |
| Power Draw | Sourced from 3500 system backplane |
| Hot‑Swap Support | Yes (3500 rack compliant) |
| Physical Weight | 0.40 kg |
| Country of Origin | United States |
Quality Control Process (Engineer’s Perspective)
- Incoming Verification: Source traceability, serial number anti‑counterfeit check, visual inspection (no corrosion/scratches). Check edge connector pins for bending or wear.
- Live Functional Test: Power‑on self‑check, backplane comms handshake, continuous load run >24 hrs with temp logging. Capture LED status snapshots every two hours.
- Electrical Parameter Test: Insulation resistance (500 V Megger, >10 MΩ), ground continuity. Flag any resistance drift below threshold.
- Firmware Verification: Read/record firmware version, photograph DIP switch/jumper settings. Well, technically it supports sensor fault alarming, but only on firmware v5.0+.
- Final QC & Packaging: Anti‑static bag seal, QC Passed label with date. Matching terminal hardware bagged alongside the unit.
BENTLY 135489‑04
Replacement Pitfall Guide
❗ Firmware Mismatch: The unit will not register correctly if host rack firmware falls below minimum revision. Older 3500 releases ignore barrier‑equipped hardware entirely.❗ DIP Switch / Jumper Misconfiguration: Factory defaults rarely match field settings. Pay close attention to input threshold jumpers on the second terminal block.❗ Terminal / Cable Incompatibility: Pin definitions shift across part revisions. Cross‑reference wiring drawings before connecting shield grounds for hazardous‑area loops.❗ Power Supply Mismatch: Recalculate total rack power with 20% headroom. Adding this module can push marginal power supplies over their continuous rating.❗ ESD Damage: Use anti‑static mat; caution in dry environments. Static discharge can degrade barrier channel performance with no visible physical damage.
Keep these in mind and you’ll cut 90% of rework time.
Compatibility Matrix & Benchmarks
- Scan cycle: 8 ms (simulated load, 2 active keyphasor channels)
- Comms throughput: Backplane bus 384 kbps (proprietary 3500 rack bus)
