WhatsApp: +86 16626708626
Email: 
Phone: +86 16626708626Description
Key Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 3500/61 (350061) |
| Manufacturer | Bently Nevada |
| Series | 3500 Machinery Condition Monitoring |
| Module Type | 6-Channel Temperature Monitor with Recorder Outputs |
| Channel Count | 6 (RTD or TC, individually configurable) |
| Input Types Supported | RTD (10 Ω copper) and Thermocouple (TC) |
| Power Consumption | 9 W nominal |
| Input Impedance | Greater than 10 MΩ per lead input |
| TC Type E Range | -100°C to +1000°C (-148°F to +1832°F) |
| RTD Accuracy | ±3°C at 25°C (±5.4°F at 77°F), 1°C/1°F resolution |
| TC Accuracy | ±1°C at 25°C (±1.8°F at 77°F) |
| Cold Junction Compensation Accuracy | ±1°C at 25°C (±1.8°F at 77°F) |
| Alarm Setpoints | Alert/Danger, adjustable 0–100% of full scale, accuracy within 0.13% of setpoint |
| Channel-to-Channel Isolation (TC-Isolated I/O option) | 250 Vdc |
| Operating Temperature | -30°C to +65°C (-22°F to +150°F) |
| Storage Temperature | -40°C to +85°C |
| Humidity | Up to 95%, non-condensing |
| TMR Support | Yes — installed in groups of three adjacent modules, two-out-of-three voting |
| Programming | RTD/TC assignment and alarm setpoints via 3500 Rack Configuration Software |
| Reference Datasheet | Document 141540 (Rev. L), 3500/60 and 3500/61 Temperature Modules Datasheet |
Product Introduction
The Bently Nevada 3500/61 is a six-channel temperature monitor module for the 3500 Machinery Condition Monitoring System, accepting both RTD and thermocouple inputs on a per-channel basis and comparing each against user-programmable Alert and Danger setpoints. It’s functionally identical to the 3500/60 with one difference: the 3500/61 adds recorder outputs on all six channels, so if your rack feeds a historian or DCS off analog temperature trends rather than just alarm contacts, this is the variant you need — not the /60.
Rear I/O options split into RTD/TC non-isolated and TC-isolated versions, the latter rated for 250 Vdc of channel-to-channel isolation where external interference is a concern. In Triple Modular Redundant configurations, these monitors install in groups of three adjacent slots and run two-out-of-three voting to keep a single sensor or module fault from tripping the process. Verify which I/O suffix you’re ordering against your existing wiring before swapping a unit in — the non-isolated and isolated versions aren’t interchangeable without a rewire.
3500/61
3500/61
Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to This Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| No OK LED illuminated | Loss of rack power or backplane fault | ❌ Low | Verify 3500/15 power supply output and rack backplane voltage | Check power supply and rack wiring before replacing this module |
| One channel reads open/max scale | Broken RTD lead or open TC junction | ❌ Low | Measure sensor resistance/continuity directly at the transducer, not at the module terminals | Fault is usually in the field wiring or sensor, not the monitor module |
| All channels drift together after a swap | Cold junction compensation mismatch or wrong I/O module (isolated vs. non-isolated) | ✅ High | Confirm I/O module part suffix matches the original; re-check CJC sensor seating | Replace with the correct I/O variant rather than forcing the swap |
| Alarm won’t clear despite normal reading | Setpoint programming error, not a hardware fault | ⚠️ Medium | Re-verify Alert/Danger setpoints in 3500 Rack Configuration Software | Reprogram before assuming the monitor itself has failed |
| Recorder output reads flat or dead | Recorder wiring fault, or a 3500/60 was installed where a /61 with recorder outputs is required | ✅ High | Confirm module is actually a 3500/61, not a 3500/60 (they look alike but differ in this exact feature) | Correct the module type if a /60 was mistakenly substituted |
If the fault persists after these checks, contact technical support with the module’s part number, the affected channel’s setpoint configuration, and the diagnostic buffer log from the 3500 Rack Configuration Software.
Frequently Asked Questions
What’s the actual difference between the 3500/60 and the 3500/61? Functionally they’re identical — same six channels, same RTD/TC input handling, same alarm logic. The only difference is the 3500/61 adds a recorder output on each of its six channels. If your system doesn’t feed a historian or chart recorder off these channels, the /60 works fine; if it does, you need the /61 specifically.
Can I mix RTD and thermocouple inputs on the same module? Yes, on the non-isolated I/O version — each of the six channels can be independently configured for RTD or TC through the 3500 Rack Configuration Software. The isolated version is typically used specifically for TC inputs where you need the 250 Vdc channel-to-channel isolation.
Is this module hot-swappable? Yes, the 3500 rack architecture supports online replacement without a full system shutdown. Still, follow your site’s change-management procedure for a live swap on any module tied to shutdown or alarm logic.
Will my alarm setpoints carry over after a module replacement? No — setpoints live in the rack’s configuration database. After swapping the physical module, reload or re-verify the channel configuration through the 3500 Rack Configuration Software before returning it to service.
Why is this priced below a factory quote from GE Vernova? This is a surplus/secondary-market unit, not a new factory order through the OEM channel, and it typically carries no OEM manufacturer warranty by default. Check the listing’s stated condition and warranty terms — surplus stock is usually sold “as-is” or with a seller-backed warranty rather than an OEM one.
Does this module support TMR (Triple Modular Redundant) configurations? Yes. For TMR, three 3500/61 modules install in adjacent slots and the system runs two-out-of-three voting logic across them to prevent a single sensor or module fault from causing a false trip.
Is the 3500/61 still in active production? The 3500 platform has a long service life, but confirm current lifecycle and support status with GE Vernova (successor to Bently Nevada’s monitoring business) if this is going into a new installation rather than a like-for-like spares replacement.
