Machinery Protection Relay Solution – Bently Nevada 3500/32 125712-01 | 3500 Series
Where This Product Is Used
The Bently Nevada 3500/32 125712-01 Channel Relay Module is deployed in continuous machinery protection systems across heavy industry. Typical installation environments include:
- Oil & Gas: Compressor trains, gas turbines, centrifugal pumps on upstream/midstream platforms
- Power Generation: Steam turbine-generator sets, boiler feed pumps, induced draft fans
- Petrochemical & Refining: Reactor agitators, extruder drives, critical rotating equipment requiring API 670 compliance
- Marine & Offshore: Propulsion shaft monitoring, auxiliary machinery protection on FPSOs and drilling rigs
- Pulp & Paper / Mining: Kiln drives, ball mills, large conveyor head pulleys
Wherever a 3500 rack monitors vibration, position, or process variables and must trip or alarm external equipment, the 3500/32 relay module is the standard output interface.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 125712-01 |
| Module Type | 4-Channel Relay Output Module |
| Series | Bently Nevada 3500 |
| Relay Channels | 4 independent relay outputs |
| Relay Type | SPDT (Form C) electromechanical relays |
| Contact Rating | 5 A @ 250 VAC / 30 VDC (resistive load) |
| Relay Logic | Energize-to-trip or de-energize-to-trip (configurable) |
| Voting Logic | 1oo1, 1oo2, 2oo2, 2oo3 (rack-level configuration) |
| Rack Compatibility | Bently Nevada 3500 Monitoring Rack |
| Slot Requirement | Single-width I/O slot |
| Power Supply | Supplied via rack backplane (no external wiring required) |
| Operating Temperature | 0 °C to +60 °C |
| Weight | 760 g (approx.) |
| Certifications | CE, SIL 1 capable (system-level), API 670 compatible |
Why Engineers Specify This Model
- Proven field reliability: The 3500/32 has accumulated millions of operating hours in critical service; its electromechanical relay design tolerates harsh electrical environments that solid-state outputs cannot.
- Flexible voting logic: Supports 1oo1 through 2oo3 voting at the rack level, enabling SIL-rated safety loop design without additional external logic solvers.
- Hot-swap capable: Modules can be replaced under power in a live rack, minimising planned downtime during maintenance windows.
- Configurable trip logic: Energize-to-trip or de-energize-to-trip selection satisfies both fail-safe and fail-secure design philosophies.
- Direct OEM integration: Native to the 3500 ecosystem — no protocol converters, no signal conditioning, no compatibility risk.
Complete System Bill of Materials
A typical 3500-series machinery protection channel using the 3500/32 relay output includes:
- 3500/05 Power Supply Module
- 3500/15 or 3500/20 Rack Interface Module
- Transducer input module (e.g., 3500/40M, 3500/42M, 3500/44M, 3500/50)
- 3500/32 125712-01 Channel Relay Output Module ← this item
- 3500 I/O Terminal Block (field wiring interface)
- Proximitor / accelerometer / velocity transducer (application-dependent)
Compliance & Industry Standards
- API 670 — Machinery Protection Systems (5th Edition): The 3500/32 is designed for use in API 670-compliant installations covering vibration, position, and temperature monitoring of critical rotating machinery.
- IEC 61511 / IEC 61508: When integrated into a validated 3500 safety loop, the relay module supports SIL 1 functional safety requirements.
- CE Marking: Compliant with applicable EU directives for industrial control equipment.
- RoHS: Manufactured in accordance with hazardous substance restrictions.
Quality Assurance & Sourcing
Every Bently Nevada 3500/32 125712-01 unit offered by Konmask.com undergoes the following before shipment:
- Visual inspection for physical damage, corrosion, and connector integrity
- Functional power-on verification in a 3500 test rack
- Relay contact continuity and isolation resistance check
- Firmware version documentation
- Anti-static packaging with humidity indicator card
Units are sourced from decommissioned plant upgrades, authorised surplus channels, and direct OEM stock. Counterfeit-risk screening is applied to every batch.
How to Source This Part
- Add to cart and proceed to checkout — standard lead time is 1–3 business days for in-stock units.
- Request a quote for volume orders (>3 units) or expedited shipping via support@konmask.com.
- Provide your rack serial number if you need firmware-matched or configuration-matched units — our team will verify compatibility before dispatch.
- International buyers: We ship worldwide with full commercial invoice and HS code documentation for customs clearance.
Application-Specific FAQ
Q: Can the 3500/32 125712-01 replace an older 3500/32 with a different dash number?
A: Dash numbers denote hardware revisions. In most cases 125712-01 is backward-compatible within the same rack generation, but always verify with your system integrator or contact us for a compatibility check.
Q: Is this module suitable for SIL 2 applications?
A: The 3500/32 supports SIL 1 at the module level. SIL 2 requires redundant architecture (e.g., 1oo2 voting with two relay modules) and a validated safety loop assessment per IEC 61511.
Q: What is the typical relay service life?
A: Bently Nevada rates the electromechanical relays for >100,000 operations under rated load. In typical machinery protection service (infrequent trips), service life exceeds 10 years.
Q: Do you provide a warranty?
A: Yes — all units carry a 90-day functional warranty. Extended warranty options are available on request.
Q: Can I get a calibration certificate?
A: Calibration certificates and test reports are available as a paid add-on service. Please specify at time of order.
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Contact: support@konmask.com | +0086 19859288691
