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Help CenterBently Nevada 3500/33-IS-01 Relay Module – Intrinsically Safe, 16‑Channel Alarm/Trip Outputs for 3500 Racks
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The Bently Nevada 3500/33-IS-01 is a 16-channel relay module designed for machine protection systems where you need dependable alarm and trip signaling, typically in hazardous areas. It ties directly into the 3500 rack, giving you configurable relay outputs for latching/non-latching alarms, voting logic, and de-energize-to-trip safety behavior. From my experience, it’s a straightforward way to route monitored conditions into ESD/DCS interlocks without adding extra interface hardware.
Key Features16 independent relay channels – Each channel can be assigned to specific alarm conditions, enabling clean segregation of alerts and trip functions.
Intrinsically Safe (-IS) variant – Appears to be intended for hazardous-area applications when installed per the 3500 system guidelines; a practical fit for Zone/Division-classified facilities.
Configurable logic and voting – Supports common strategies like 2‑out‑of‑3 voting and de-energize-to-trip, which in many cases simplifies compliance with site safety philosophy.
Latching or non‑latching behavior – Choose how each relay reacts to alarms; operators typically prefer latching for trips and non‑latching for warnings.
Dry contact outputs – Form A/Form C style contacts (depending on I/O option) for direct interface to ESD, PLC, or DCS inputs without signal conditioning.
Backplane-powered – No external power; the module draws from the 3500 rack, which keeps panel wiring neat and reduces failure points.
System integration – Events and status are available through the 3500/22M TDI for System 1 software and plant historian connectivity.
| Brand / Model | Bently Nevada 3500/33-IS-01 (16‑Channel Relay Module, IS variant) |
| Power Requirements | Supplied via 3500 rack backplane; no external power supply required |
| Channels / Outputs | 16 dry contact relay outputs; configurable NO/NC, latching/non‑latching (per I/O option) |
| Signal I/O Types | Form A / Form C relay contacts (assignment via 3500 configuration); de‑energize-to-trip supported |
| Communication Interfaces | Status and events available through 3500 rack/TDI (no direct Ethernet on this module) |
| Operating Temperature | Typically -20°C to +65°C (refer to the official datasheet for exact limits) |
| Installation Method | Front module in a 3500 rack slot with matching rear I/O module; field wiring via terminal blocks |
| Form Factor | 3500 full-height module; single-width slot occupancy with rear I/O |
| Hazardous Area Suitability | IS variant; intended for use in classified areas when installed per Bently Nevada guidance |
This module is commonly specified in oil & gas, petrochemical, power generation, chemicals, pulp & paper, and mining. You’ll typically see it driving ESD trips, permissives, and annunciation panels based on vibration, speed, or process alarms coming from other 3500 monitor cards (e.g., 3500/42M, 3500/25, 3500/45). In many cases it replaces discrete interposing relays, which simplifies the panel and helps maintenance teams trace alarm logic faster.
“We used the 3500/33 IS relays to implement 2oo3 trips on a gas compressor line. Commissioning went smoother than expected, and proof testing is quicker now.” — Maintenance lead, upstream gas facilityAdvantages & Value
Reliability for safety functions – De‑energize-to-trip behavior and voting options align with common safety practices, which seems to reduce nuisance trips when tuned correctly.
Clean integration – Works natively with the 3500 platform; no extra interface relays or external logic blocks in most cases.
Lower lifecycle cost – Fewer third‑party components, simpler wiring, and faster troubleshooting usually translate to long‑term savings.
Compatibility and support – Supported by Bently Nevada tooling, TDI/System 1 connectivity, and established spares strategy across many plants.
Cabinet and environment – Install in a standard 3500 rack within a properly ventilated cabinet; maintain ambient conditions within the rack specification.
Wiring – Use the rear I/O terminal blocks; keep relay wiring segregated from high‑noise conductors. For the IS variant, follow the hazardous‑area entity/installation parameters strictly.
Configuration – Assign channels to alarms/trips, set latching behavior, and define voting logic via 3500 configuration software. You might notice commissioning goes faster if channel naming mirrors your P&IDs/E&I drawings.
Proof testing – Periodically function‑test each relay and verify trip logic paths to the ESD/PLC. Many sites do annual checks; some high‑criticality assets opt for semi‑annual.
Firmware and records – Keep firmware aligned with the rack’s TDI recommendations and log configuration changes for audit trails.
Certifications – Typically CE and UL/cUL; IS versions are commonly available with ATEX/IECEx or similar approvals for hazardous areas when installed per the manual.
RoHS/ISO – RoHS compliance and manufacturing under ISO‑certified quality systems are commonly associated with the 3500 family.
Warranty – Manufacturer warranty applies; specific terms depend on region and contract. We can confirm coverage and lead times case‑by‑case.
3500/22M TDI – Transient Data Interface for rack communications
3500/05 Power Supply – AC or DC options for the rack
3500/42M Proximitor/Seismic Monitor – Vibration inputs driving relay logic
3500/25 Keyphasor Module – Speed/phase reference for rotating assets
3500/32M or 3500/32M-IS – 4–20 mA interface outputs to DCS (where needed)
If you’re standardizing across multiple units, we can help align I/O options (such as Form A vs. Form C contacts) so spares remain consistent. In most cases, having a matched set across trains saves time during turnarounds.
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