Bently Nevada 3500/42M-A09-B00 Proximitor

Bently Nevada 3500/42M-A09-B00 Proximitor/Seismic Monitor (Dynamic Data Acquisition Module)

Brand: Bently Nevada (Baker Hughes), part of the 3500 Series TSI Machinery Protection System. Official Name: Proximitor/Seismic Monitor. Base Order Part Number: 143694-01. It is a 4-channel programmable card supporting both protection alarming and dynamic waveform acquisition, serving as the core monitoring card for steam turbine units.

1. Model Code Explanation: 3500/42M-A09-B00

3500: 3500 TSI Machinery Protection System

/42M: 4-channel Proximitor/Seismic Monitor card. The suffix “M” means dynamic waveform acquisition is supported. The legacy 3500/42 does not support dynamic data acquisition.

A09: Segment A = Sensor Input Option. 09 = Supports both Proximitor (Eddy Current) and Seismic sensors (velocity / acceleration).

B00: Segment B = Certification Option. 00 = Without CSA NRTL/C certification; B01 is the version with CSA certification.

Distinction Notes

A01: Eddy current input only; A02: Seismic sensor input only; A09 hybrid type can connect to 3300XL eddy current probes for shaft vibration / axial displacement measurement, and also piezoelectric velocity sensors for bearing housing vibration measurement.

3500/40M: Speed and keyphase only; 3500/45: Temperature card; 3500/42M is the primary monitoring card for vibration and displacement.

1. Core Technical Specifications

III. Core Functions

1. Paired channel configuration: Channels 1&2 can be configured for shaft vibration while channels 3&4 for bearing housing vibration. The same card can mix eddy current and seismic sensors.
2. Static protection measurement: Calculate vibration amplitude and displacement values in real time, compare with setpoints to trigger Alert / Danger alarms, and send signals to 3500/33 relay card for hardwired unit trip protection.
3. Dynamic waveform acquisition (core feature of M version): Capture raw vibration waveforms, 1X/2X amplitude and phase, upload to System1 for spectrum and orbit analysis to diagnose faults such as rotor unbalance, misalignment and rub.
4. Sensor self-diagnosis: Detect probe open circuit, short circuit and excessive gap deviation; sensor faults are directly logged into rack event history.
5. REBAM® Bearing Condition Monitoring: Bently patented algorithm to evaluate bearing oil film stability.
6. Event logging: Alarms and sensor faults are recorded with timestamps, which can be uploaded to DCS through 3500/92 communication gateway card.
7. Typical Application Scenarios

Steam turbines, centrifugal compressors, axial fans, large motors; TSI systems in thermal power, coal chemical and oil & gas refining industries.

Eddy current channels: Rotor radial vibration, axial displacement, differential expansion

Seismic channels: Bearing housing casing vibration (velocity / acceleration)

1. Installation & Configuration Guidelines
2. Wiring: Eddy current probe extension cable + proximitor. Cable length must be matched (3300XL system uses fixed-length cables, must not be arbitrarily cut). Seismic sensor shielded cable with single-point grounding.
3. Configuration Procedure

Connect rack via Rack Configuration software and add 3500/42M card.

Channel grouping: Set channel1/2 to eddy current radial vibration; channel3/4 to seismic velocity.

Set sensor sensitivity, measurement range, Alert warning value and Danger trip setpoint.

Enable dynamic acquisition and configure waveform sampling parameters.

Download configuration to rack; confirm channel OK LED steady on, perform probe gap verification and simulate alarms to test relay operation.

3. Commissioning: Verify eddy current probe gap voltage (around -10V DC); calibrate seismic sensor sensitivity.
4. Common Troubleshooting Checklist
5. OK LED flashing: Missing / invalid card configuration, re-download rack configuration.
6. Channel reports sensor fault: Abnormal proximitor power supply, open/short circuit of cable, worn probe or out-of-range gap; check gap voltage output from proximitor.
7. Fluctuating vibration readings: Multi-point grounding of proximitor shield, cable routed near power cables causing interference; loose probe mounting.
8. Normal static value but no dynamic waveform in System1: Dynamic acquisition not enabled in configuration, or missing 3500/22M transient interface module.
9. Danger alarm fails to trigger relay: Verify alarm voting logic and configuration mapping between 3500/33 relay card.

VII. Series Comparison & Model Selection

Metrix ST5484E-123-434-22 Seismic Velocity Vibration Transmitter

Brand: Metrix (USA). ST5484E is an integrated 2-wire loop-powered velocity vibration transmitter. It adopts built-in piezoelectric accelerometer core, integrating circuit and true RMS processing, directly outputs 4–20mA signal for bearing housing casing vibration monitoring. Different from Bently eddy current probes which measure shaft vibration.

1. Model Code Explanation: ST5484E-123-434-22

Model format: ST5484E AAA BBCC EF

123: Range code, 2.0 in/s (50.8 mm/s RMS), 4mA=0; 20mA=full scale 50.8mm/s

434: Filter, mounting thread, housing material

4: Filter option

3: Mounting thread 1/4-28 UNF stud mounting

4: 316 stainless steel housing

22: Electrical connection + explosion-proof certification

2: 2-terminal block wiring

2: Ex ia IIC T4 intrinsically safe version

Distinction Notes

ST5484E: Casing vibration velocity transmitter; ST5491E with local display; SW5484E with built-in relay vibration switch.

1. Core Technical Specifications

III. Core Functions

1. Integrated RMS processing: Built-in integration and true RMS circuit, directly output 4-20mA proportional to vibration velocity. Can be connected to DCS/PLC directly without extra proximitor.
2. IPT non-polar loop: Wiring without positive/negative polarity distinction to reduce field wiring errors.
3. Intrinsically safe explosion protection: Zone 0 intrinsically safe, applicable for hazardous areas in chemical and petrochemical industries.
4. Optional narrowband filter to suppress high-frequency interference, fit for rolling bearing equipment monitoring.
5. Single-direction measurement: Measures along sensor axial direction; align monitoring direction (horizontal / vertical) during installation.
6. Typical Application Scenarios

Bearing housing casing vibration monitoring for centrifugal pumps, fans, motors, gearboxes and small compressors; petrochemical, coal chemical and power plants.

>Comparison with Bently 3500/42M: ST5484E outputs standard 4-20mA to DCS and cannot provide raw dynamic waveform for spectrum analysis. Bently 42M can capture raw waveforms for fault diagnosis.

1. Installation & Commissioning Guidelines
2. Installation: Stud must be tightened on flat metal surface of bearing housing, polish and remove rust on contact surface. Sensor axial direction must align with measured vibration direction. Avoid installation on thin wall or stiffener (resonance interference).
3. Wiring: 2-wire intrinsically safe loop, intrinsically safe safety barrier is mandatory. Shielded cable single-point grounding; do not route together with power cables in the same cable tray.
4. Loop calculation: Maximum allowable loop resistance depends on supply voltage. Max loop resistance ≈650Ω under 24VDC supply.
5. Calibration: Full-unit calibration on vibration shaker table. No zero or span adjustment knobs inside sensor; range cannot be modified on site.
6. Configuration: Set in DCS: 4mA=0 mm/s, 20mA=50.8 mm/s, configure high vibration alarm and high-high interlock setpoints.
7. Common Troubleshooting Checklist
8. Fixed 4mA output: Broken loop, faulty safety barrier, loss of sensor power supply; damaged internal sensing element.
9. Fixed 20mA output: Short circuit in loop, damaged internal circuit of sensor, vibration exceeds full scale.
10. Fluctuating readings: Loose mounting, resonance on contact surface; multi-point grounding of shield; cable interference from inverter power lines.
11. Low vibration readings: Wrong installation direction; paint/gasket on contact surface leading to weakened vibration transmission.

VII. Series Comparison & Model Selection