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Help CenterBently Nevada 3500/60 133811-01 Temperature Monitor – Multi‑channel Temperature Protection for Critical Rotating Assets
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The Bently Nevada 3500/60 (I/O variant 133811-01) is a multi‑channel temperature monitor for the 3500 rack, designed to acquire RTD and thermocouple signals and drive protection alarms for bearings, windings, and process-critical points. In many cases it becomes the go‑to card when you need reliable, rack‑based temperature protection tightly integrated with your vibration and machine protection system. From my experience, it fits especially well in plants standardizing on the 3500 architecture and System 1 software.
Multi‑channel temperature monitoring – typically configured for high channel density to consolidate bearing, casing, winding, and lube oil measurements in one module.
RTD and Thermocouple support – accepts common Pt100 RTDs (2‑ or 3‑wire) and standard TC types (J, K, T, E, R, S, B, N) so you can mix sensor types across machines.
Integrated alarm processing – per‑channel Alert/Danger setpoints with latching options, helping operators react before excursions threaten equipment.
Tight rack integration – data and events share the 3500 backplane, with trip voting and relay logic handled at the rack level (via 3500/32M and TDI 3500/22M).
Cold Junction Compensation (CJC) – CJC on the I/O module for accurate thermocouple readings without external hardware.
Flexible alarming and voting – works with the 3500 system’s relay modules for logic, voting, and shutdown circuits commonly required by API‑670 style protection schemes.
System 1 connectivity (via TDI) – historical trending, audit trails, and event capture help maintenance teams validate actions and optimize alarm setpoints.
| Brand / Model | Bently Nevada 3500/60 Temperature Monitor, I/O p/n 133811-01 |
| Channels | Multi‑channel (high‑density temperature monitoring; typical 3500 configuration supports extensive point counts per rack) |
| Signal Inputs | RTD (Pt100, 2‑ or 3‑wire); Thermocouples (Types J, K, T, E, R, S, B, N) with onboard CJC on the I/O module |
| Alarm Setpoints | Per‑channel Alert and Danger thresholds, programmable via 3500 configuration tools |
| Communication Interfaces | Through 3500/22M TDI over Ethernet; module communicates via 3500 backplane (no direct fieldbus on the card itself) |
| Power Requirements | Powered from the 3500 rack backplane; no external power to the front module |
| Operating Temperature | Typically 0 to +65 °C for 3500 rack modules (refer to system manual for exact limits) |
| Installation Method | Front plug‑in monitor + matching rear I/O module (133811-01), single 3500 rack slot |
You’ll typically find the 3500/60 wherever temperature is a critical protection parameter alongside vibration. A few practical examples we see in the field:
API‑670 machine trains: bearing metal temperatures on compressors, turbines, and large pumps.
Generators and motors: stator RTDs, winding hot‑spots, and bearing housings for large electric machines.
Gas turbines and turboexpanders: exhaust or casing thermocouples to track thermal gradients and manage thermal stress.
Lube and seal systems: oil supply/return temperatures tied into trip logic for thermal runaway prevention.
Refining, petrochemical, and LNG: mixed RTD/TC panels where density and alarm integrity matter more than standalone PLC analog cards.
Reliability that matches critical service – purpose‑built for protection tasks; alarm processing and diagnostics are consistent with 3500 best practices.
Compatibility and lifecycle – drops into existing 3500 racks, works with your current TDI and relay modules, and integrates with System 1 without custom drivers.
Cost of ownership – consolidates many temperature points per slot, reducing cabinet footprint and wiring complexity versus scattered single‑loop instruments.
Serviceability – front‑accessible module replacement; rear I/O (133811-01) retains field wiring, which typically cuts mean time to repair.
Panel and rack – install in a Bently 3500 rack within an IP‑rated cabinet. Provide clean, dry air circulation; avoid heat sources and EMI where possible.
Wiring practices – land sensors on the 133811-01 rear I/O; maintain polarity and wire type for thermocouples; use shielded cables and proper grounding. Avoid mixing TC extension wire types.
Configuration – set sensor type, units, linearization, and Alert/Danger limits using the 3500 configuration software; validate with simulated inputs.
Safety and ESD – de‑energize circuits before servicing; observe ESD handling for module swaps to protect sensitive electronics.
Routine care – verify readings against a reference annually (or per site policy); check terminal tightness, clean dust, and review event logs. Firmware updates, when applicable, are managed through the TDI.
CE and UL/cUL compliance for industrial control equipment (3500 system).
CSA and, in many cases, ATEX/IECEx hazardous area ratings when installed per the system manual.
RoHS alignment on current production modules, as available by region.
Standard manufacturer limited warranty (typically 1 year); extended coverage often available via service agreements.
Customer note: A maintenance lead in a gas compression station told us the 3500/60 “seems to be the simplest way to pull all our bearing RTDs into the same trip logic as vibration, without juggling a separate PLC.” That’s been consistent with what we’ve seen on brownfield retrofits.
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