Description

The BENTLY 3500/22-01-01-00 is a dual-channel resistance temperature detector(RTD)input module from Emerson’s Bently Nevada 3500 Machinery Protection System,engineered to monitor critical temperatures such as bearing metal,stator winding,lube oil,or seal gas in rotating equipment.As a dedicated analog I/O card,it converts RTD resistance values into precise temperature readings and provides independent relay outputs for alarm and trip functions—fully integrated within the 3500 protection architecture.

Designed for high-reliability applications,this module supports both Pt100 and Pt1000 sensors and delivers±0.1°C measurement accuracy,making it indispensable for early fault detection in turbines,compressors,and generators.

Application Scenarios

At a combined-cycle power plant in Germany,repeated generator bearing failures were traced to delayed response from legacy DCS-based temperature alarms.Engineers replaced the system with BENTLY 3500/22-01-01-00 modules directly monitoring Pt100 sensors embedded in thrust bearings.Within weeks,the system detected a 5°C/hour thermal rise during startup—a signature of lubrication starvation—and triggered an automatic trip before metal-to-metal contact occurred.This intervention prevented a potential$2M repair and validated the BENTLY 3500/22-01-01-00 as a frontline defense against thermal degradation in mission-critical assets.

Parameter

Main Parameters Value/Description

Product Model 3500/22-01-01-00

Manufacturer Bently Nevada(Emerson)

Product Category Dual-channel RTD temperature input module

Input Channels 2 independent,isolated RTD inputs

Supported RTD Types Pt100(IEC 60751),Pt1000(3-wire or 4-wire configuration)

Measurement Range–200°C to+850°C(sensor-dependent)

Accuracy±0.1°C typical(with 4-wire connection)

Excitation Current 1 mA(low-power to minimize self-heating)

Relay Outputs 2 Form C relays per channel(Alert&Danger)

Relay Rating 2 A 30 V DC/1 A 120 V AC

Sampling Rate≥5 Hz per channel

Communication Via 3500 backplane to 3500/15 or 3500/15E

Environmental Rating 0°C to+65°C;CE,CSA,ATEX(with certified rack)

Compliance API 670(5th Ed.),ISO 7919,IEC 60751

Note:The suffix“-01-01-00”denotes standard configuration:2 channels,Pt100 support,non-redundant wiring.

Technical Principles and Innovative Values

Innovation Point 1:True 4-wire RTD support eliminates lead-wire resistance errors—critical for long cable runs in large turbines where even 0.5Ωerror can cause>1°C deviation.

Innovation Point 2:Per-channel sensor diagnostics detect open circuits,short circuits,and out-of-range conditions,preventing“false normal”readings that could mask developing faults.

Innovation Point 3:Independent relay logic per channel allows flexible protection strategies—e.g.,Channel 1 trips on high bearing temp,while Channel 2 only alerts on lube oil inlet temp.

Innovation Point 4:Seamless integration with 3500 Configuration Software enables engineering-unit display(°C/°F),deadband tuning,and time-delay settings without external signal conditioners.

Innovation Point 5:Low excitation current(1 mA)minimizes self-heating of the RTD element,preserving measurement fidelity in low-mass installations like motor windings.

Application Cases and Industry Value

In an LNG liquefaction train in Qatar,six refrigerant compressors operate continuously under extreme ambient heat.Previously,bearing temperatures were monitored via 4–20 mA transmitters feeding the DCS—introducing latency and single-point failure risks.After retrofitting with BENTLY 3500/22-01-01-00 modules reading direct Pt100 sensors,the plant achieved sub-second temperature response and hardwired trip capability.During a sandstorm-induced cooling fan failure,the system tripped three compressors within 12 seconds of bearing temps exceeding 110°C—avoiding catastrophic seizure.Maintenance teams now use the high-resolution trend data from the 3500/22-01-01-00 for predictive analytics,extending mean time between failures by 35%.

Related Product Combination Solutions

3500/42M 140482-01:Vibration monitor often co-installed with 3500/22-01-01-00 for multi-parameter protection

3500/20 125768-01:4–20 mA process input module for pressure/flow signals complementing temperature data

3500/53 133350-01:Voting module enabling 2oo3 redundant temperature trip logic across three 3500/22 units

3500/15 133292-01:Communication interface for Modbus TCP/IP data export to SCADA

330901-00:Magnetic pickup for speed reference during thermal ramp-up analysis

3500 Chassis 133192-01:Standard 14-slot rack housing the 3500/22-01-01-00

Pt100 Sensors(e.g.,WIKA TR10):High-stability RTDs recommended for pairing with this module

3500/32M 133442-01:Overspeed monitor that can be interlocked with temperature trips for holistic protection

This ecosystem enables a unified,auditable machinery protection strategy—from sensing to shutdown—aligned with functional safety standards.

Installation,Maintenance,and Full-Cycle Support

Installing the BENTLY 3500/22-01-01-00 requires proper RTD wiring discipline:use twisted-pair shielded cable,ground shield at the rack end only,and avoid routing near VFDs or high-current conductors.For highest accuracy,configure as 4-wire in the 3500 software—even if only three physical wires are used(common in legacy sensors).During commissioning,perform a“resistance injection test”using a decade box to validate calibration across the full range.

The module requires no routine calibration but benefits from annual loop checks.Its front-panel LEDs indicate power,channel status,and relay activation—accelerating troubleshooting.In case of failure,hot-swap replacement is supported in live racks.

We maintain ready stock of genuine BENTLY 3500/22-01-01-00 units sourced through authorized Emerson channels.Each undergoes full functional testing:RTD simulation at multiple points(0°C,100°C,etc.),relay actuation verification,and software recognition check.We provide 12-month warranty,multilingual documentation,and expert support for system integration—from single-machine retrofits to enterprise-wide protection upgrades.

Contact us for a customized solution to transform your temperature monitoring from passive observation into active machinery protection.

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