Bently Nevada 3500/33-02-00 – 16‑Channel Failsafe Relay Output Module

Order Placement Process and Guarantees

• Warranty: 365 days
• Lead time: typically 1 week if in stock; no more than 1 month latest
• Payment: 50% advance, balance before delivery
• Express options: FedEx, UPS, DHL

Key Features

• 16-channel failsafe relay outputs (SPDT): Each channel can be assigned to specific alarms or statuses; failsafe behavior de‑energizes on fault or power loss.
• Programmable alarm logic: Configure AND/OR voting, alert/danger, Not‑OK, and channel status mapping through 3500 configuration software.
• Arc suppression built in: Standard 250 Vrms arc suppressors help extend contact life and reduce EMI on switching.
• Rugged contact ratings: Up to 5 A (resistive) with well-documented DC/AC limits for standard and safety-centric applications.
• Full-height module with rear I/O: Clean separation of front diagnostics and rear field wiring; simplifies cabinet layout.
• Non‑TMR version: For TMR applications, use 3500/34; this model is aimed at conventional rack deployments.
• System-friendly integration: Powered by the rack backplane; configuration via standard 3500 software toolchain—no external comms required.

Technical Specifications

Application Fields

From my experience, the 3500/33-02-00 fits best where you need deterministic, hardware-level outputs from a protection rack—without adding a separate safety PLC for basic trip logic.

• Oil & Gas: Turbocompressors, pumps, gas turbines—map Danger alarms to ESD or fuel trip valves.
• Power Generation: Steam and gas turbine protection, condenser vacuum alarms, bearing high‑vibration trips.
• Petrochemical: Fans, blowers, and critical agitators—drive MCC trips and annunciators.
• Metals & Mining: Critical conveyor drives and mills—use logic voting before shutdown to avoid nuisance trips.
• General Industry: Route alarms to DCS, horns/beacons, or hardwired interlocks where SIL isn’t mandated.

A maintenance lead told me they replaced two DIN relay banks with a single 3500/33, cutting panel depth and making loop checks faster during turnarounds.

Advantages & Value

• Reliability: Failsafe design de‑energizes on power loss or Not‑OK; epoxy‑sealed relays and built‑in arc suppression improve longevity.
• Compatibility: Native to the 3500 ecosystem—no protocol mapping or gateway boxes.
• Cost & space savings: Consolidates 16 outputs in one module; typically reduces wiring, terminal blocks, and troubleshooting time.
• Configuration flexibility: Adjust logic in software instead of rewiring; easier MOC and documentation control.
• Lifecycle support: Widely used in brownfield sites; spare pooling across units is straightforward.

Quality & Certifications

• EMC: EN 61000-6-2, EN 61000-6-4; Emissions per EN 55011/CISPR 11
• Electrical Safety: EN 61010-1; LVD 2014/35/EU
• EU EMC: 2014/30/EU
• Hazardous area: This variant is B=00 (no specific hazardous approvals). For Zone 2/Class I Div 2, choose agency-approved options (e.g., B=01/B=02), subject to local availability.
• Manufacturer warranty: typically 1 year; our supplied units ship with a 365-day warranty.

Notes on Selection & Compatible Components

• Not for TMR: For triple modular redundancy, specify Bently Nevada 3500/34.
• Displays: Works with 3500/93 LCD (FW P or newer) and 3500/94 VGA (FW C or newer) for clear status and alarm visualization.
• Typical rack companions: 3500/22M RIM, 3500/15 power supplies, and condition monitoring modules such as 3500/40M, 3500/42M—mapping respective alerts to this relay module is straightforward.
• Agency approvals: If your site requires Zone 2/Class I Div 2, select a 3500/33 with the appropriate B option and confirm regional certifications.