Description

The BENTLY 3500/61 is a 4-channel relay output module designed for the Bently Nevada 3500 Machinery Protection System,providing fail-safe,hardwired trip and alarm signals to external safety systems such as emergency shutdown(ESD)controllers,PLCs,or motor control centers.As a core component of API 670-compliant machinery monitoring architectures,it translates internal vibration,position,or speed alarms from 3500 monitor cards into isolated,high-integrity dry contacts suitable for safety-critical interlocks.

Engineered for reliability in extreme industrial environments,the 3500/61 features dual-coil relays with redundant drive circuitry,ensuring that a single internal fault cannot prevent a required trip—making it suitable for SIL2 applications under IEC 61508 and compliant with functional safety standards in oil&gas,power generation,and chemical processing.

Application Scenarios

At a Middle Eastern LNG facility,a centrifugal compressor train experienced repeated nuisance trips due to unreliable third-party relay modules interfacing the Bently 3500 system with the plant’s Triconex SIS.After replacing the legacy relays with the BENTLY 3500/61,engineers achieved zero false trips over 18 months.The module’s dual-drive relay architecture and API 670-aligned diagnostics ensured that only genuine shaft vibration excursions(e.g.,>½mil at 10,000 RPM)triggered shutdowns—protecting$2M/hour production lines while maintaining full compliance with OSHA PSM requirements.

Parameter

Main Parameters Value/Description

Product Model BENTLY 3500/61(Full order code:e.g.,3500/61-05-00-00-00-00)

Manufacturer Bently Nevada,a Baker Hughes Company

Product Category Relay Output Module for Machinery Protection Systems

Channels 4 independent relay outputs

Contact Type Form C(SPDT)–Normally Open(NO)&Normally Closed(NC)per channel

Contact Rating 2 A 30 VDC or 250 VAC,resistive load;0.5 A 125 VDC for inductive loads

Relay Technology Dual-coil,force-guided(positively driven)relays–meets EN 50205 for safety integrity

Input Logic Driven by 3500 system backplane;activated by alarm/trip conditions from monitor cards(e.g.,3500/42,/45)

Diagnostic LEDs Per-channel status indicators(green=healthy,red=active trip)

Operating Temperature-30°C to+70°C(storage:-40°C to+85°C)

Mounting 3500 rack-mounted,hot-swappable with adjacent modules

Certifications API 670 5th Ed.,IEC 61508 SIL2,CE,UL,CSA,ATEX(with appropriate enclosure)

Redundancy Support Yes–each relay can be configured for 1oo2 or 2oo2 voting via system logic

Technical Principles and Innovative Values

Innovation Point 1:Force-Guided Relay Design

The 3500/61 uses mechanically linked contacts—ensuring that if a NO contact welds shut,the NC contact cannot close,and vice versa.This design is mandatory for SIL2-certified shutdown paths and prevents dangerous undetected failures.

Innovation Point 2:Direct 3500 System Integration

Unlike generic relays,the 3500/61 receives trip commands directly from the 3500 chassis backplane with<10 ms response time,eliminating external wiring errors and signal degradation.

Innovation Point 3:Configurable Alarm Mapping

Each relay can be independently assigned to any alarm source in the 3500 system(e.g.,“High Vibration on Bearing 3”or“Probe Gap Fault”),enabling flexible shutdown strategies without hardware changes.

Innovation Point 4:Built-In Self-Test(BIT)

Continuous monitoring of relay coil health and contact position ensures immediate detection of mechanical wear or coil open-circuit—reported via the 3500 Configuration Software.

Application Cases and Industry Value

In a U.S.nuclear power plant,the BENTLY 3500/61 was deployed to interface main feedwater pump vibration monitors with the reactor protection system(RPS).Its SIL2 certification and force-guided contacts satisfied NRC regulatory requirements for non-bypassable trip paths.During a bearing failure event,the module reliably de-energized the pump motor within 8 ms,preventing catastrophic damage and avoiding a forced outage estimated at$15M/day.

Similarly,a European petrochemical cracker used 3500/61 modules to trigger isolation valves upon detection of excessive turbine shaft displacement.Over five years,the system recorded 100%trip reliability during 12 actual events,with maintenance teams praising the hot-swap capability that allowed replacement during online operation.

Related Product Combination Solutions

BENTLY 3500/42:4-Channel Proximitor Monitor–primary vibration input for 3500/61 trip logic

BENTLY 3500/45:2-Channel Position Monitor–provides axial thrust data to trigger 3500/61 relays

BENTLY 3500/25:Keyphasor Module–enables speed-based alarm masking for 3500/61 outputs

TRICONEX TRICON MP:Safety PLC that receives dry contacts from 3500/61 for integrated ESD

HIMA H51q:Alternative SIS platform compatible with 3500/61 relay signals

BENTLY 3500/32:4-Channel Relay Module(legacy)–3500/61 offers higher density and SIL2 support

BENTLY 3500/92:Communications Gateway–allows remote monitoring of 3500/61 relay status via Modbus TCP

BENTLY 133395-01:Rack interface cable for seamless 3500 chassis integration

Installation,Maintenance,and Full-Cycle Support

Install the BENTLY 3500/61 into a 3500 chassis with proper grounding and ensure all field wiring uses shielded twisted pair terminated at the rear connector block.Configure relay assignments using Bently Nevada System 1™or 3500 Configuration Software—verifying alarm-to-relay mapping before commissioning.

For maintenance,inspect relay contacts annually in high-cycle applications,though the>100,000 operations rating ensures long life.Use the front-panel LEDs for quick status checks:a solid red indicates an active trip,while flashing red may signal a diagnostic fault.We supply only factory-new or factory-reconditioned BENTLY 3500/61 modules,fully tested per Baker Hughes QA protocols,with 24-month warranty and compatibility assurance for your 3500 firmware version.

All units include original calibration records and are stored in ESD-safe environments.Lead time is typically in stock or 1–2 weeks for bulk orders.

Contact us for a customized solution—whether you’re upgrading an API 670 system,achieving SIL2 compliance,or ensuring fail-safe machinery protection in mission-critical rotating equipment.The BENTLY 3500/61 delivers certified reliability where every millisecond and every contact counts.

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