Bently Nevada 136703-01 Proximitor/Seismic I/O Module (BNC)

Description

Product Introduction

The Bently Nevada 136703-01 is a four-channel rear Input/Output (I/O) interface module designed specifically to partner with the 3500/42M Proximitor/Seismic Monitor inside the 3500 Machinery Protection System. Installed in the full-height rear slot directly behind the main 3500/42M processing card, the 136703-01 provides field wiring termination as well as direct, unbuffered/buffered dynamic diagnostic access.

Engineered for Internal Termination setups requiring convenient diagnostic hookups, the 136703-01 features integrated Euro-style screw terminals alongside onboard coaxial BNC connectors for each channel. It routes regulated -24V DC transducer power out to field sensors while feeding dynamic vibration, position, or velocity signals into the 3500/42M card—simultaneously making raw AC/DC signals available via the BNC jacks for portable data collectors, analyzers, or diagnostic software (like System 1).

Key Technical Specifications

Application Scenarios & The “Trench” Experience

During periodic machinery health audits at a gas processing facility, vibration specialists need to connect a portable multi-channel FFT analyzer to monitor dynamic orbit plots on a critical multi-stage compressor. Cabinets equipped with standard terminal cards require awkward alligator-clip test leads that risk shorting adjacent terminals. Racks fitted with the 136703-01 rear I/O module allow diagnostics teams to plug standard BNC cables directly into the back panel for instant, isolated dynamic signal access. This eliminates shorting hazards, preserves signal integrity, and keeps transient analysis work completely isolated from the primary machinery trip logic.

• High-Criticality Turbo-Machinery: Provides dedicated BNC diagnostic ports for continuous or periodic transient analysis during startups and shutdowns.
• Refinery & Petrochemical Compressors: Routes main proximity sensor wiring via screw terminals while allowing rapid portable analyzer connections.
• Power Plant Generators & Turbines: Facilitates offline spectrum, cascade, and orbit plot collection without altering field sensor wiring.
• 3500 Rack Maintenance & Upgrades: Ideal replacement rear module for facilities standardizing on internal screw terminals with direct rear-panel BNC signal access.

Transparency SOP: Quality Assurance & Testing

1. Visual & Structural Inspection: Screw terminals, BNC connector housings, internal PCB traces, and edge connectors are checked for stripped threads, corrosion, loose jacks, or mechanical wear.
2. Backplane Alignment & Compatibility Test: Installed into a live Bently Nevada 3500 test chassis behind a functional 3500/42M main card to verify slot recognition and mechanical alignment.
3. Signal Pass-Through & BNC Buffer Audit:
   • Power Pass-Through Verification: Confirmed stable -24V DC field transducer power delivery across all 4 terminal groups.
   • Dynamic Signal & BNC Output Test: Precision AC/DC signals from a calibrator are passed through all 4 channels to verify linear transmission to the front processing card and short-circuit-proof signal output at the BNC ports.
4. Final ESD Packaging: Cleaned, fitted with protective contact caps over BNC ports and edge pins, sealed in anti-static shielding bags, and packed in heavy-duty foam casing.

136703-01

136703-01

The Veteran’s Tech Trap Guide (Crucial Value-Add)

• ⚠️ 135489-01 vs. 136703-01 Variant Identification: Both modules are internal termination cards for the 3500/42M monitor, but the 136703-01 includes coaxial BNC ports on the card faceplate for direct diagnostic connections. Ensure your cabinet depth and rear door clearance account for plugged-in BNC cables.
• ❗ Buffered Signal Isolation: The BNC connectors on the 136703-01 provide short-circuit protected buffered outputs. Accidentally shorting a BNC pin or cable during testing will not distort the primary sensor signal or trip the front 3500/42M monitor channel.
• ⚠️ Front Card Compatibility Constraint: Pair this card strictly with a 3500/42M Proximitor/Seismic Monitor. Mismatched pairings (e.g., plugging a 3500/25 Keyphasor or 3500/45 Position card into this slot) will cause a card-mismatch configuration error on the 3500/22M Rack Interface Module (RIM).
• ❗ Single-Point Shield Grounding: Always connect cable shields at the designated SHIELD screw terminals on the 136703-01 board. Leave shields ungrounded/floating at the field junction box to prevent 50/60 Hz ground loops from corrupting low-level vibration measurements.

Frequently Asked Questions (FAQ)

Q: What is the primary function of the Bently Nevada 136703-01?

A: It is the internal termination rear I/O card for the 3500/42M Proximitor/Seismic Monitor, featuring internal screw terminal blocks for field sensor cabling and coaxial BNC connectors for buffered dynamic signal access.

Q: Can I use the BNC ports on the 136703-01 for continuous online monitoring systems like System 1?

A: Yes. The BNC ports output isolated, buffered raw signals identical to the front-panel BNC ports on the monitor card, making them suitable for temporary diagnostic hookups or permanent connection to online diagnostic hardware.

Q: What transducer types can be wired to the 136703-01 module?

A: It supports inputs from 3300 XL proximity probes, accelerometers, Velomitors, and electrodynamic Seismoprobes as configured on the front 3500/42M card.

Q: Is it necessary to power down the 3500 rack before replacing this rear card?

A: Yes. Powering down the rack slot or isolating transducer power before servicing rear I/O cards prevents accidental short circuits across backplane terminal pins.

Q: What warranty is provided on surplus or reconditioned 136703-01 modules?

A: All New Surplus and fully reconditioned Bently Nevada 136703-01 modules include a full 12-month replacement warranty from the invoice date.