Bentley 3300/25 - XX-XX-XX-00-00-03-00 Dual Channel Acceleration Vibration Monitoring Module

I. Product Overview

The Bentley 3300/25 is a dual-channel accelerometer monitor (Dual Accelerometer Monitor) in the 3300 series TSI of Baker Hughes (formerly GE Bentley Nevada), specifically designed for high-precision absolute vibration (seismic type) monitoring of the casing/structure. The model you provided, 3300/25-XX-XX-XX-00-00-03-00, is a general configuration template: the first three XX are the range / filtering / sensitivity customization positions, and the last few are fixed as: no certification, no special isolation, 03 = dual-channel sealed relay, standard output. 

It receives piezoelectric accelerometer signals and measures high-frequency vibrations of the bearing seat, casing, gearbox, and foundation structure, used for early warnings of imbalance, misalignment, bearing failure, gear wear, loosening, etc., and is widely used in large rotating machinery such as steam turbines, gas turbines, compressors, fans, pumps, and motors in thermal power, nuclear power, petrochemical, and metallurgical industries.

II. Model Coding Rules (3300/25-XX-XX-XX-00-00-03-00)

3300: 3300 series TSI system

25: Function code = Dual-channel accelerometer monitoring (Accelerometer Monitor)

AA: Channel A range / sensitivity (e.g. 03 = 0–10g, 05 = 0–20g, 15 = 0–50g, etc.)

BB: Channel B range / sensitivity (same as AA)

CC: Filter combination (high pass / low pass, set by jumper, over 10,000 combinations)

DD: Certification (00 = None)

EE: Isolation / safety barrier (00 = None)

FF: Relay configuration (03 = Dual-channel sealed relay: Warning + Danger)

GG: Output / interface (00 = Standard)

Your unit: 3300/25-XX-XX-XX-00-00-03-00

→ Dual-channel, range / filter to be determined, dual-channel sealed alarm relay, no certification, standard output.

III. Core Functions

1. Dual-channel independent acceleration vibration measurement

Input: 2 channels of piezoelectric accelerometers (IEPE / voltage type), standard sensitivity 100 mV/g

Measurement: Absolute vibration of the casing (seismic type), zero peak (0–p) display

Frequency response: Typical 2.7 Hz–10 kHz (depending on filter setting)

Range: Optional 0–10g / 0–20g / 0–50g, etc.

Accuracy: ≤±0.5% FS, high-frequency resolution

2. Programmable dual-level alarm + dual-channel sealed relay (03)

Each channel independent: ** Alert (Alert), Danger (Danger) ** two-level thresholds

Alarm delay: 0–10 seconds adjustable, anti-fault alarm

Relay: 2×SPDT sealed type, corresponding to Alert and Danger; contacts 2 A / 24 VDC, can directly interlock shutdown

No analog output (standard configuration), focused on vibration monitoring + alarm + interlock + upload

3. Flexible filtering (via jumper)

High pass: 0.1 Hz, 1 Hz, 10 Hz, etc.

Low pass: 100 Hz, 1 kHz, 5 kHz, 10 kHz, etc.

Combination: Over 10,000 types, suitable for bearings, gears, high-frequency impacts, etc. different monitoring objects

4. Comprehensive self-diagnosis

Monitoring: Sensor open circuit / short circuit, power supply, module hardware, signal overload / undervoltage

Panel LED: OK, Alert, Danger, Bypass, fault code direct display

5. System integration

Bus: 3300 backplane bus, connected to System 1 platform

Data: Real-time vibration values, alarm status, fault information upload

Isolation: Input / power ≥ 2500 VAC, anti EMI/RFI

IV. Technical Parameters (Standard Configuration)

Input and Measurement

Channels: 2 independent

Sensor: Piezoelectric accelerometer, 100 mV/g

Range (optional): 0–10g, 0–20g, 0–50g

Frequency response: 2.7 Hz–10 kHz (unfiltered)

Accuracy: ±0.5% FS

Display: Zero peak (0–p)

Electrical Power Supply: -24 VDC (±10%), Backplane Power Supply

Power Consumption: ≤ 5 W

Relay: 2×SPDT Sealed, 2 A / 24 VDC

Insulation: Input - Power ≥ 2500 VAC

Environment and Mechanics

Operating Temperature: 0 °C – +65 °C

Storage Temperature: -40 °C – +85 °C

Humidity: 5% – 95% (No Condensation)

Installation: 19" Rack, Hot Swap

Dimensions: Approximately 203×330×51 mm

Weight: Approximately 0.85 – 1 kg Compliance

Standard: API 670

EMC: CE (EN 61000‑6‑2/4)

VII. Typical Applications

Electricity: Turbine / Generator bearing seats, foundations, gearbox high-frequency vibration

Petroleum: Centrifugal compressors, reciprocating machines, pumps, motor casings vibration

Metallurgy: Large fans, motors, reducers structural vibration

Core Value: Capture high-frequency impacts / Early bearing damage / Gear wear, earlier warning than shaft vibration

VI. Installation and Wiring Tips

Frame: Standard 19" slots, hot-swappable, locking fixation

Sensor: Accelerometer rigidly installed on bearing seat / casing, shielded cable single-ended grounding (inside the cabinet)

Wiring: Differentiate excitation / signal / ground; Open circuit / short circuit will trigger module failure

Relay: Warning, danger switching DCS/PLC/ interlock circuits

VII. Maintenance and Fault Diagnosis

Daily: Check OK/Alert/Danger lights, vibration values stable, no fault codes

Calibration: Every year use standard vibration table to verify sensitivity and alarm points

Common Faults:

OK off: -24 VDC abnormality, module damage, backplane contact failure

Vibration jump: Sensor loosening / breakage, grounding current, strong interference

False alarm: Threshold too low, delay too short, improper filtering

VIII. Precautions

Compatible piezoelectric accelerometers (100 mV/g), cannot be connected to eddy current / thermocouple

High-frequency vibration monitoring, not used for shaft displacement / shaft vibration (requires 3300/16 etc.)

Non-explosion-proof type, prohibited for use in hazardous areas

Do not plug or unplug the module while powered on