The Bently Nevada 125680-01 is the Proximitor I/O Module with Internal Terminations for the 3500/40M Proximitor Monitor in the 3500 Machinery Protection System. It is a full-height rear I/O card that serves as the critical hardware interface between field-mounted proximity transducers (Bently Nevada 3300 XL series) and the front-facing 3500/40M monitor module.
Item No :
125680-01Order(MOQ) :
1 PiecePayment :
EXW/CIFProduct Origin :
USAShipping Port :
WuhanLead Time :
3-5daysWeight :
3kg| Specification | Description |
|---|---|
| Manufacturer | Bently Nevada (Baker Hughes) |
| Model | 125680-01 |
| Product Family | 3500/40M Proximitor Monitor |
| Product Type | Proximitor I/O Module (Internal Terminations) |
| Compatible Monitor | 3500/40M Proximitor Monitor (main card 176449-01) |
| Number of Channels | 4 non-isolated proximity transducer input channels |
| Supported Sensors | Bently Nevada 3300 XL 8mm, 11mm, and 25mm proximity transducers |
| Transducer Excitation | -24 VDC power supply provided by the monitor |
| Input Impedance | 10 kΩ per channel |
| Termination Type | Internal Terminations (built-in screw terminal blocks) |
| Power Consumption | 7.7 W typical |
| Loop Diagnostics | Detects open-circuit and short-circuit conditions on transducer loops |
| Hot Swap | Supported (rack main power can remain energized) |
| Operating Temperature | -30°C to +65°C (-22°F to +150°F) |
| Storage Temperature | -40°C to +85°C (-40°F to +185°F) |
| Humidity | 95%, non-condensing |
| Dimensions (W x H x D) | 24.4 mm x 241.3 mm x 99.1 mm |
| Weight | Approx. 0.20 kg (0.44 lb) |
| PCB Treatment | Conformal-coated printed circuit board |
| Certifications | CE, CSA, ATEX hazardous-area approvals, API-670 compliant |
| Country of Origin | USA |
| Lifecycle Status | Active / Available as New Surplus |
| Model | Description | Typical Application |
|---|---|---|
| 125680-01 (this model) | Proximitor I/O Module with Internal Terminations | Standard 3500/40M monitoring with internal rack wiring |
| 126615-01 | Proximitor I/O Module with External Terminations | Applications requiring external wiring access |
| 135489-04 | Proximitor I/O Module with Internal Barriers + Internal Terminations | Hazardous area (intrinsically safe) applications |
| 149716-01 | TMR Proximitor I/O Module with External Terminations | Triple Modular Redundant configurations |
| 176449-01 | 3500/40M Proximitor Monitor (main card) | Companion front card for the 125680-01 |
| 3500/42M | Proximitor/Seismic Monitor | Applications requiring seismic (velocity/acceleration) inputs |
Q1: What is the primary function of the 125680-01?
It is the rear I/O module for the 3500/40M Proximitor Monitor. It serves as the direct hardware interface linking external eddy current proximity transducers to the front-facing monitor. It provides stable sensor power excitation, receives raw analog displacement voltages, and channels these signals through the backplane to the main processor card for computation of machinery metrics like radial vibration, shaft eccentricity, thrust position, differential expansion, and REBAM.
Q2: What is the difference between 125680-01 and 126615-01?
The primary difference is the termination method. The 125680-01 uses Internal Terminations — field wiring connects directly to built-in screw terminal blocks on the module. The 126615-01 uses External Terminations — field wiring connects to separate external termination blocks, with a ribbon cable linking to the I/O module .
Q3: Can the 125680-01 accept signals from non-Bently Nevada proximity sensors?
No. The internal pathways and scaling matrices are calibrated specifically for Bently Nevada proximity transducers. Using third-party probes will break linear scale factors, invalidate measurement conversions, and generate calibration errors.
Q4: How do I troubleshoot a channel showing a persistent "NOT OK" status?
Measure the raw DC gap voltage across the SIG and COM terminals with a multimeter. A healthy probe displays between -4V DC and -16V DC. If the voltage is near 0V or mirrors the full -24V supply, the fault is likely a cable short or open conductor in the field rather than an I/O module failure .
Q5: Is the 125680-01 hot-swappable?
Yes. The module supports hot-swap operation — rack main power can remain energized during module replacement. However, pulling the module immediately cuts excitation power to field sensors, triggering a "Monitor Fault." Before removal, toggle the rack keylock switch to PROGRAM mode and enable software channel bypass flags via the 3500 Rack Configuration Software to prevent downstream emergency trip relays from activating.
The Bently Nevada 3500/60-01-00 is a 6-Channel Temperature Monitor for the 3500 Machinery Protection System. The complete configuration consists of the 163179-01 Temperature Monitor (main card) and the 133819-01 RTD/TC I/O Module with internal terminations.
The Bently Nevada 3500/53M-01-00 is a Single-Channel Electronic Overspeed Detection Module for the 3500 Machinery Protection System, configured with the 286566-01 Overspeed Detection main card and the 133396-01 Overspeed Detection I/O Module.
The Bently Nevada 3500/53M-01-00 is a Single-Channel Electronic Overspeed Detection Module for the 3500 Machinery Protection System. The 3500/53M is the split-base M-series version, using the 286566-01 main card with the 133396-01 rear I/O module. It is not drop-in compatible with the legacy 3500/53 (133388-01).
The Bently Nevada 3500/53M-01-00 is a Single-Channel Electronic Overspeed Detection Module for the 3500 Machinery Protection System. The 3500/53M is the split-base M-series version, using the 286566-01 main card with the 133396-01 rear I/O module. It is not drop-in compatible with the legacy 3500/53 (133388-01).
The Bently Nevada 3500/53-03-00 is a Single-Channel Electronic Overspeed Detection Module for the 3500 Machinery Protection System, configured with the 133388-01 Overspeed Detection main card and the 133396-01 Overspeed Detection I/O Module.
he Bently Nevada 288062-02 is the Tachometer Module main card for the 3500/50M Tachometer Module in the 3500 Machinery Protection System. It is a dual-channel module that accepts input from proximity probes or magnetic pickups to determine shaft rotational speed, rotor acceleration, and rotor direction.
The Bently Nevada 3500/50M-01-00 is a 2-Channel Tachometer Module for the 3500 Machinery Protection System, configured with the 288062-02 Tachometer main card and the 133442-01 I/O Module with internal terminations. The "M" designation indicates M-series functionality, providing enhanced integration with System 1 diagnostic software.
The Bently Nevada 133442-01 is a dual-channel Tachometer I/O Module with Internal Terminations, designed for the 3500/50 Tachometer Module in the 3500 Machinery Protection System. The module conditions raw pulse signals to determine shaft rotational speed, rotor acceleration, and rotor direction, and can supply conditioned Keyphasor signals to the rack backplane for use by other monitoring modules.
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