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Phone: +86 16626708626Description
- Key Technical Specifications
| Parameter | Value |
| Manufacturer | Bently Nevada |
| Part Number | 125840-02 |
| System Compatibility | Bently Nevada 3500 Series Rack |
| Module Type | 3500/60 Temperature Monitor I/O Module |
| Input Channels | 6 temperature channels |
| Supported Inputs | 3-wire RTD, 4-wire RTD, Thermocouple (Types J, K, T, E, R, S) |
| Channel Isolation | 500 V DC channel-to-channel and channel-to-system |
| Power Consumption | 7.0 W maximum |
| Operating Temperature | −30 to +65 °C (−22 to +149 °F) |
| Storage Temperature | −40 to +85 °C (−40 to +185 °F) |
| Mounting | Rear slot of 3500 System Rack |
- Product Introduction & Supply Chain Strategy
The Bently Nevada 125840-02 is a 6-channel temperature monitor I/O module designed for the 3500 Machinery Protection System. It conditions signals from resistance temperature detectors (RTDs) and thermocouples to protect critical rotating equipment—such as turbines, compressors, and large pumps—against thermal overload.
Stocking this item as New Surplus protects your facility from catastrophic machinery downtime while maintaining capital efficiency. Refurbished cards carry a high risk of degraded components, which can trigger false trips or fail to register severe thermal spikes. Purchasing New Surplus ensures original OEM reliability at a total cost of ownership (TCO) lower than direct factory lead times allow, serving as an essential buffer stock for your critical plant assets.
125840-02
125840-02
- Installation & Configuration Guide
Stage 1: Pre-Installation (Prep & Safety)
- Perform lock-out/tag-out (LOTO) on connected high-voltage machinery if maintenance procedures require.
- Strap on a grounded ESD wristband before handling the module.
- Document the existing module’s DIP switch locations, jumper settings, and channel assignments. Photograph terminal wiring connections prior to removal.
Stage 2: Removal
- Loosen the upper and lower captive screws on the existing rear I/O card using a flathead screwdriver.
- Gently pull the module outward using the extraction handles. Move strictly in a straight vector to avoid bending or damaging the backplane pins.
Stage 3: Installation (Clone & Seat)
- Set all DIP switches and hardware jumpers on the new 125840-02 module to match the original unit precisely.
- Align the card with the rear rack guides and push firmly until the backplane connectors fully seat. Hand-tighten the upper and lower captive screws.
- Reconnect terminal blocks according to your documented wiring diagram.
Stage 4: Power-On & Testing
- Verify 24 V DC power distribution to the rack.
- Observe the 3500 rack main display or software status: confirm the channel LEDs transition to green (RUN) without lighting red (ERR/FAULT).
- Connect via Bently Nevada 3500 Rack Configuration Software to verify input channel scaling and setpoint trip limits.
- Firmware/Software Versions & Upgrade Notes
- Recommended Firmware: Requires 3500/60 main module firmware revision 2.10 or higher for full feature compliance.
- Compatibility Notice: Software configuration must be completed using Bently Nevada 3500 Configuration Software (version 5.0 or later). Older software builds may fail to recognize the hardware ID of newer board revisions.
- Upgrade Caution: Never alter firmware versions during an emergency swap. Match the replacement card’s firmware to the existing rack configuration. Updating firmware on live protection systems risks dropping communication handshakes or causing unprompted alarm trips.
- Frequently Asked Questions (FAQ)
Q: Why is this New Surplus card cheaper than direct OEM pricing, but more expensive than refurbished units?
A: Our pricing reflects the market value of original, unused factory surplus obtained from canceled projects and consolidated inventories. It avoids high OEM markups while eliminating the catastrophic risks associated with second-hand, repaired, or worn-out components.
Q: Is the Bently Nevada 125840-02 module an obsolete part?
A: While the 3500 series remains widely supported across industry, individual component lead times from the manufacturer can extend to several months. Holding a New Surplus unit on-site prevents unscheduled shutdown delays caused by supply chain bottlenecks.
Q: Can I hot-swap the 125840-02 I/O module while the 3500 rack is powered?
A: Yes, the 3500 system architecture supports hot-swapping of I/O modules. However, removing a active temperature monitor module will temporarily disable protective trips on those 6 channels, which can trigger system alerts. Always bypass affected channels in software before extraction.
Q: Does this module store channel alarm limits and configuration settings?
A: No. Calibration data, trip setpoints, and sensor types are stored in the main 3500/60 monitor processing card paired with this I/O module. The 125840-02 handles signal conditioning and physical terminal connections.
Q: What warranty comes with this module?
A: Every 125840-02 New Surplus unit comes backed by a comprehensive 1-year replacement warranty, fully verified through physical inspection, backplane continuity testing, and ESD-safe packaging sign-off.
