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Key Technical Specifications
| Parameter | Specification |
| Part Number | 136703-01 |
| Manufacturer | Bently Nevada (Baker Hughes) |
| Associated Main Module | 3500/50 and 3500/50M Tachometer Modules |
| Channel Count | 2 Transducer Channels (Proximitor Probes or Magnetic Pickups) |
| Protection Type | Galvanic Intrinsic Safety (IS) Internal Barriers |
| Termination Style | Internal Terminations (screw terminal blocks directly on card) |
| Input Frequency Range | Up to 20 kHz (Minimum: 0.0167 Hz for Proximitor, 3.3 Hz for Magnetic Pickups) |
| System Requirement | Requires 3500/04-01 IS Earthing Module installed in rack |
| Rack Slot Position | Rear full-height slot (directly behind 3500/50M main monitor) |
| Dimensions (H × W × D) | 241.3 mm × 24.4 mm × 163.1 mm (9.50 in × 0.96 in × 6.42 in) |
| Weight | 0.46 kg (1.01 lb) |
| Operating Temperature | −35°C to +85°C (−31°F to +185°F) |
Product Introduction & Supply Chain Strategy
The Bently Nevada 136703-01 is a 2-channel rear I/O module equipped with internal galvanically isolated intrinsic safety barriers, designed specifically for the 3500/50M Tachometer Monitor. It receives raw pulses from proximity sensors or magnetic pickups in hazardous field environments, conditioning and isolating speed, reverse rotation, and acceleration signals before passing them into the 3500 backplane.
Acquiring this part as New Surplus guarantees uncompromised explosion protection and signal integrity, avoiding the hidden thermal fatigue and component drift common in used or reconditioned barrier boards. Keeping 1–2 New Surplus units in strategic plant stock prevents long factory lead times and protects high-value turbomachinery from unexpected shutdown events.
- 136703-01
- 136703-01
Installation & Configuration Guide
Stage 1: Pre-Installation (Prep & Safety)
- Verify the 3500 chassis includes an active 3500/04-01 Intrinsically Safe (IS) Earthing Module properly connected to the plant IS ground bus.
- Put on a grounded anti-static wrist strap attached directly to the rack enclosure frame.
- Perform Lock-Out/Tag-Out (LOTO) on speed trip channels and label field wiring before touching the terminal connections.
Stage 2: Removal
- Loosen the top and bottom captive thumbscrews on the existing rear 136703-01 card using a flathead screwdriver.
- Carefully draw the module straight out along its card guide rails. Avoid twisting to prevent damaging the backplane multi-pin connector.
Stage 3: Installation (Clone & Seat)
- Inspect the new 136703-01 PCB, backplane pins, and terminal strips for absolute physical integrity.
- Align the board with the card guides in the rear full-height slot directly behind the 3500/50M tachometer monitor card.
- Press firmly until the card edge snaps completely into the backplane, then hand-tighten both mounting thumbscrews.
Stage 4: Power-On & Testing
- Reconnect field transducer wires to the internal screw terminals following the approved wiring schematic.
- Re-energize the slot and check that the front 3500/50M monitor status LEDs register a solid green “OK.”
- Read speed pulse inputs via the Bently Nevada 3500 Configuration Software to confirm correct signal thresholds and gap voltages.
Firmware/Software Versions & Upgrade Notes
- Firmware Dependencies: The 136703-01 is a passive, barrier-isolated signal routing card with no programmable microprocessors or flash firmware.
- System Software Configuration: Configured using Bently Nevada 3500 System Configuration Software. Ensure speed channels are explicitly set to “Internal Barrier” mode.
- System Constraints: Racks utilizing internal barrier I/O modules require a 3500/04-01 IS Earthing Module, which occupies a dedicated monitor slot and reduces total available monitor positions in a 19-inch rack to 13. Triple Modular Redundant (TMR) rack configurations cannot use internal barrier I/O modules.
Frequently Asked Questions (FAQ)
Is this unit a genuine New Surplus module or a refurbished part?
This product is a Brand New Surplus unit. It is not used, not pulled from a decommissioned plant, and not refurbished. All modules undergo rigorous quality verification to ensure OEM-level reliability.
Why is New Surplus superior to refurbished barrier I/O cards?
Intrinsic safety barriers rely on precision zener diodes, resistors, and galvanic isolation transformers to prevent electrical energy sparks in hazardous areas. Refurbished modules carry unseen stress risks that can cause incorrect speed readings, false trip signals, or compromised explosion protection margins.
Can I use magnetic pickups with internal barrier cards for zero speed detection?
While the 136703-01 supports magnetic pickups for general speed monitoring, magnetic pickups are not recommended for zero-speed or reverse-rotation applications because they do not provide a clean pulse edge at extremely low speeds. Use proximity probes for zero-speed detection.
Can I hot-swap this rear I/O card while the machine is running?
Pulling a rear I/O module interrupts field sensor pulses to the front 3500/50M monitor, triggering a channel “Not OK” fault and potentially initiating automatic speed trip logic. Always bypass associated tachometer protection channels in software before replacing an I/O card.
What warranty covers this 136703-01 module?
Every New Surplus 136703-01 module comes backed by a full 1-year functional warranty. Each card ships in ESD-safe packaging complete with inspection and quality sign-off documentation.
