Bentley 3300/55-03-04-06-06-00-00-05-00 Dual-channel Speed Vibration Monitoring Module - Detailed Product Description

I. Product Overview

The Bentley 3300/55-03-04-06-06-00-00-05-00 is a dual-channel speed vibration monitoring module of the Bentley Nevada 3300 series TSI (Turbo Generator Monitoring Instrument) system. It is specifically designed for high-precision continuous monitoring of absolute vibration speed of rotating and reciprocating machinery, and is compatible with seismic speed sensors (Velomitor). It captures low-frequency mechanical faults (such as bearing wear, foundation loosening, structural resonance) that the electro-vortex probe cannot cover. The module adopts a standard 19-inch rack-mounted modular design, supports hot swapping, and can be disassembled and replaced without power-off of the system, compatible with the 3300 series racks and power supply system. The 3300/55 is equipped with the Bentley Velomitor series speed sensors, which measure the peak vibration speed in real time, have dual-channel independent monitoring, programmable filtering, multiple-level alarms, fault self-diagnosis, and system integration capabilities, strictly following API 670 standards. It is widely used in non-explosive areas of industries such as power, petrochemicals, metallurgy, and water treatment, and is compatible with turbo generators, gas turbines, centrifugal compressors, fans, pump sets, motors, etc., for absolute vibration monitoring of the housing / bearing seat, low-frequency fault warning, and safety interlock protection.

II. Model Coding Rules (3300/55-XX-XX-XX-XX-XX-XX-XX-XX-XX)

3300: This is the classic 3300 series modular TSI system of Bentley, installed on a standard 19-inch rack, supporting multi-module combination, centralized power supply, and hot swapping.

55: Function code, defined as a dual-channel speed vibration monitoring module, processing two seismic speed sensor signals, measuring absolute vibration speed.

The following 9-digit configuration codes (3300/55-03-04-06-06-00-00-05-00):

The 1st digit (sensor sensitivity): 03 = 100 mV/in/s (standard Velomitor).

The 2nd digit (frequency response): 04 = 10Hz~1000Hz (-3dB), covering low-frequency to medium-frequency vibrations.

The 3rd digit (range / channel 1): 06 = 0~6.0 mm/s pk (peak speed).

The 4th digit (range / channel 2): 06 = 0~6.0 mm/s pk (peak speed).

The 5th digit (Keyphasor interface): 00 = no speed synchronization input.

The 6th digit (analog output): 00 = no 4-20mA/0-10V output.

The 7th digit (relay configuration): 05 = 2 SPDT relays (warning / danger) per channel.

The 8th digit (communication interface): 00 = no additional communication, compatible with 3300 system bus.

The 9th digit (special function): 00 = standard type, no customized functions.

III. Core Functions

Dual-channel independent speed measurement: The two input channels are completely independent, synchronized sampling, compatible with 2 Velomitor speed sensors (100 mV/in/s), real-time measurement of the peak absolute vibration speed of the bearing seat / housing, electrical isolation between channels, single-point failure does not affect the other channel, ensuring continuous monitoring. Broadband programmable filtering: Built-in high-order low-pass / high-pass filters, standard frequency response of 10Hz~1000Hz, configurable on-site, precisely filters high-frequency noise and DC components, focuses on the characteristic vibration frequency of the equipment, captures low-frequency faults such as bearing wear, structural loosening, and resonance.

High-precision signal acquisition and processing: Uses 24-bit high-speed ADC sampling, dynamic range > 80dB, measurement accuracy ≤ ±1% reading, resolution 0.1 mm/s, can stably capture tiny vibration changes; supports speed / acceleration / displacement signal conversion (integration / differentiation), suitable for different fault analysis requirements.

All-round fault self-diagnosis: Built-in OK self-check circuit, 24-hour monitoring of sensor breakage, short circuit, signal over-limit, sensitivity abnormality, etc. faults, accurately distinguishes mechanical faults from sensor circuit faults, reduces false alarms / false interlocks; panel LED synchronously displays channel OK, fault, bypass status.

Programmable multi-level alarm and interlock: Each channel independently sets two levels of warning (Alert) / danger (Danger) speed thresholds, alarm delay 0~10 seconds programmable, filters instantaneous fluctuations; the entire machine is equipped with 4 SPDT passive relay contacts (2 contacts per channel), rated load 250V AC/3A, 30V DC/3A, directly connected to sound and light alarm and unit safety interlock circuit.

Local status display and operation: Front panel integrates high-contrast light column display, synchronously displays real-time values of dual-channel vibration speed and alarm status; combined with operation keys, complete parameter settings such as range, filtering, alarm threshold, delay, etc. locally, without the need for a host computer, operation is intuitive and convenient.

Strong anti-interference and system integration: Metal shielding structure, input / output / power circuit electrical isolation, common-mode interference resistance ≥ 2500V AC, resisting electromagnetic interference from frequency converters, high-voltage equipment; supports 3300 internal bus communication, compatible with System 1 monitoring software, realize remote configuration, data storage, trend analysis and fault traceability.

VII. Technical Parameters Measurement parameters

Number of channels: 2 fully independent, synchronous and isolated channels.

Sensor compatibility: Bently Velomitor speed sensor (100 mV/in/s), high-temperature Velomitor system (HTVS).

Measurement range: 0 - 6.0 mm/s pk (peak speed, standard configuration).

Frequency response: 10Hz - 1000Hz (-3dB), programmable filtering.

Sampling rate: 256 samples/second per channel.

Measurement accuracy: ≤ ±1% reading, resolution 0.1 mm/s, dynamic range > 80dB.

Signal conversion: supports speed ↔ acceleration ↔ displacement (integration / differentiation).

Alarm settings: two-level alarms per channel (warning / danger), delay 0 - 10 seconds programmable.

Electrical parameters

Power supply: -24V DC (allowable fluctuation ±10%), 3300 rack backplane power supply.

Power consumption: ≤ 3W, maximum working current 15mA.

Input impedance: matches Velomitor sensor standard input impedance.

Relay output: 4 SPDT non-polarized contacts, 250V AC/3A, 30V DC/3A.

Isolation performance: high-voltage electrical isolation between input/output/power supply, common-mode interference resistance ≥ 2500V AC.

Environmental and mechanical parameters

Operating temperature: -30℃ - +65℃ (standard type).

Storage temperature: -40℃ - +85℃.

Relative humidity: 0% - 95% (no condensation).

Installation method: 3300 series standard 19-inch rack slot installation, supports hot swapping.

Shell material: metal panel + flame-retardant engineering plastic, shock-resistant, corrosion-resistant, oil-resistant.

Protection class: IP20 (installed inside the control cabinet).

Size: 254mm × 165mm × 63.5mm (standard 3300 module size).

Weight: approximately 1.2kg.

Certification and compliance

Industry standards: complies with API 670 rotating machinery monitoring and protection standards.

Electromagnetic compatibility: CE certification, complies with EN 61000-6-2, EN 61000-6-4 standards.

Safety certification: UL, RoHS compliance.

Explosion-proof rating: non-explosion-proof design, no built-in safety barrier, only applicable to non-flammable and non-explosive areas.

VII. Structural Design

The module adopts a standard rack-mounted modular structure, compact layout, divided into front panel, internal main circuit, and rear terminal block. It is convenient for installation, wiring and maintenance.

Front panel: integrates dual-channel light column display (real-time display of vibration speed value), power / OK / alarm / fault LED indicators and operation keys, for on-site data viewing, alarm status, parameter configuration, operation is intuitive.

Internal main circuit: two completely independent signal processing units (corresponding to channels 1/2), each set contains signal conditioning, filtering, high-speed sampling, calculation, alarm comparison and relay drive circuits, no electrical connection between channels, single-point failure does not affect the other channel.

Back terminal block: zone layout, clearly divided into dual-channel sensor input terminals, 4-channel relay alarm terminals, power terminals and system communication interface, clear identification, neat wiring, convenient for wiring, inspection and maintenance.

Hot-swappable design: the module and the rack backplane use gold-plated connectors, reliable contact, support online insertion and removal, replacing the module does not require stopping the entire TSI system, reducing the impact of maintenance on the unit operation.

VIII. System Compatibility

Hardware compatibility Rack and Power Supply: Perfectly Compatible with 3300 Series Standard 19-inch Rack, System Power Module, System Monitoring Module. Modules with functions such as vibration, displacement, and speed in the same series can be installed and work together in a mixed configuration.

Sensing Components: Fully Compatible with Bently Velomitor (100 mV/in/s) and High Temperature Velomitor (HTVS) Speed Sensors. Sensors of the same specification can be directly interchanged without the need for recalibration.

Output Connection: Relay contacts can be connected to audible and visual alarms, unit interlock circuits, DCS/PLC dry contact inputs to achieve alarm and protection linkage.

Software Compatibility

Configuration Software: Compatible with the 3300 Series dedicated configuration software, supporting remote parameter configuration, alarm logic editing, filtering settings, and firmware upgrades.

Monitoring Software: Compatible with System 1 Equipment Status Monitoring Software, enabling real-time vibration data acquisition, trend analysis, fault recording storage, report generation, and remote access, supporting the full lifecycle management of equipment.

VII. Typical Application Scenarios

Power Industry: Absolute vibration monitoring of bearing seats/shells of steam turbines and gas turbines in thermal power plants, warning of low-frequency faults such as bearing wear, foundation loosening, and structural resonance, ensuring the safe and stable operation of the main unit.

Petrochemical Industry: Vibration monitoring of non-explosion-proof centrifugal compressors, process turbines, and large pump groups in non-explosion-proof areas, avoiding unplanned shutdowns caused by low-frequency faults and ensuring continuous production.

Metallurgical Industry: Vibration monitoring of bearing seats of blast furnaces, sintering main exhaust fans, and large drive motors, predicting potential hazards such as bearing failure, foundation loosening, and resonance, reducing equipment failure rates.

General Industry: Large rotating machinery (grinding mills, fans, pump groups) in industries such as cement, papermaking, and water treatment, conducting online monitoring of shell absolute vibration, low-frequency fault diagnosis, and safety interlock protection, extending equipment service life and reducing operation costs.

VIII. Installation and Maintenance Specifications

Installation Requirements

Rack Installation: Module smoothly inserted into an empty slot of the 3300 rack, ensuring that the gold-plated connectors at the rear are fully engaged, tightening the panel screws to prevent loosening.

Sensor Wiring: Connect Velomitor sensor signal cables to the corresponding input terminals according to channel numbers. Ensure the wiring is secure, with the shielding layer grounded at one end to avoid interference.

Alarm Wiring: Connect relay contacts to the audible and visual alarm circuit or the unit safety interlock circuit according to the design drawings. Distinguish between warning and dangerous contacts to ensure correct interlock logic.

Power On Configuration: Confirm normal -24V DC power supply before powering on. Through panel buttons or remote configuration software, set parameters such as range, filtering, alarm threshold, and delay, and save for effect.

Sensor Installation: Velomitor sensors are vertically or horizontally installed on the rigid part of the bearing seat to ensure close contact with the shell, cable fixation and protection, and to avoid vibration wear.

Daily Maintenance

Inspection and Check: Regularly observe the display on the panel and LED indicators to confirm normal dual-channel vibration data and no fault alarms; check for any looseness, oxidation, or overheating at the connection terminals, and promptly address potential hazards.

Precision Calibration: Calibrate the module's measurement accuracy annually using a standard vibration bench to ensure compliance with API 670 standards.

Clean Cooling: Regularly clean the module surface and rack slots of accumulated dust to ensure good ventilation and cooling, preventing short circuits or poor cooling faults caused by dust accumulation.

Spare Parts Replacement: When replacing modules, sensors, or cables, must use Bently original products of the same model. Do not use non-original components to avoid compatibility issues or measurement errors.

IX. Usage Precautions

This module is not explosion-proof and has no built-in safety barrier. It is strictly prohibited to install and use it in flammable and explosive, areas with combustible gases or dust. The original Velomitor speed sensor from Bently (100 mV/in/s) must be used in conjunction. Other specifications of sensors must not be mixed. Otherwise, it will lead to sensitivity mismatch and measurement failure.

The sensor should be installed on the rigid part of the bearing housing, firmly attached, and not placed in thin-walled or non-rigid areas to prevent distortion of vibration transmission and increase measurement errors.

It is prohibited to disassemble the module, modify the internal circuitry or change the factory-calibrated parameters of the sensor. Illegal operations will cause equipment damage and also result in loss of product warranty rights.

Before conducting wiring, maintenance or module replacement operations, the power supply of the frame must be cut off to prevent short circuits and electric shock accidents.

The alarm threshold, delay and other parameters must be strictly set according to the process requirements of the unit. Improper parameters will cause protection failure or frequent false alarms.

The installation position of the module should be as far away as possible from power frequency converters, transformers, high-voltage distribution cabinets and other strong electromagnetic interference sources to reduce the influence of external interference on the measurement signal.