Bentley 3300/55-03-01-05-05-00-00-01-00 Dual-channel Speed Vibration Monitoring Module Detailed Product Description

I. Product Overview

The Bentley 3300/55-03-01-05-05-00-00-01-00 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. It is compatible with seismic speed sensors (Velomitor) and can effectively detect low-frequency mechanical faults that the eddy current probe cannot cover, such as bearing wear, foundation loosening, structural resonance, etc. The module adopts a standard 19-inch rack-mounted modular design, supports hot swapping, and can be disassembled, replaced, and installed without power interruption in the system. It is 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. It has 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, with standard 19-inch rack installation, 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 (3300/55-03-01-05-05-00-00-01-00):

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

The 2nd digit (frequency response): 01 = 3Hz~300Hz (-3dB), optimized for low-frequency vibration monitoring.

The 3rd digit (range/channel 1): 05 = 0~5.0 mm/s pk (peak speed).

The 4th digit (range/channel 2): 05 = 0~5.0 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): 01 = 1 SPDT relay per channel (common alarm).

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/casing, electrical isolation between channels, single-point failure does not affect the other channel, ensuring continuous monitoring. Low-frequency dedicated programmable filtering: Built-in high-order low-pass/high-pass filters, standard frequency response 3Hz~300Hz, precisely focusing on the characteristic frequencies of low-frequency faults such as bearing wear, foundation loosening, and structural resonance, filtering out high-frequency noise, and suitable for the monitoring requirements of low-speed rotating machinery.

High-precision signal acquisition and processing: Using 24-bit high-speed ADC sampling, dynamic range > 80dB, measurement accuracy ≤ ±1% reading, resolution 0.1 mm/s, capable of stably capturing 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, abnormal sensitivity, etc., accurately distinguishing mechanical faults from sensor circuit faults, reducing the probability of false alarms/false interlocks; panel LED synchronous display of channel OK, fault, bypass status.

Programmable alarm and interlock: Each channel independently sets two levels of speed thresholds (Alert/Danger), alarm delay 0~10 seconds programmable, filtering out instantaneous fluctuations; the entire machine is equipped with 2 SPDT passive relay contacts (1 contact per channel), rated load 250V AC/3A, 30V DC/3A, directly connected to the sound and light alarm and unit safety interlock circuit.

Local status display and operation: Front panel integrates a high-contrast light column display, synchronously displaying real-time values of dual-channel vibration speed and alarm status; combined with operation keys, on-site complete parameter settings such as range, filtering, alarm threshold, delay, 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, anti-common-mode interference ≥ 2500V AC, resisting inverter, high-voltage equipment electromagnetic interference; supports 3300 internal bus communication, compatible with System 1 monitoring software, achieving remote configuration, data storage, trend analysis and fault traceability.

Four. Technical parameters

Measurement parameters

Channel quantity: 2 completely independent synchronous isolated channels.

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

Measurement range: 0~5.0 mm/s pk (speed peak, standard configuration).

Frequency response: 3Hz~300Hz (-3dB), programmable filtering.

Sampling rate: 256 samples/second per channel.

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

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

Alarm settings: Each channel two-level alarm (alert/danger), delay 0~10 seconds programmable.

Electrical parameters

Operating 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: 2 SPDT passive contacts, 250V AC/3A, 30V DC/3A.

Isolation performance: Input/output/power interconnection high-voltage electrical isolation, anti-common-mode interference ≥ 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, supporting hot swapping.

Shell material: Metal panel + flame-retardant engineering plastic, with抗震， corrosion resistance， and oil resistance properties.

Protection level： IP20 (for internal installation of control cabinet).

Dimensions: 254mm × 165mm × 63.5mm (standard 3300 module dimensions).

Weight： Approximately 1.2kg.

Certification and compliance

Industry standards： Compliant with API 670 Rotating Machinery Monitoring and Protection Standards.

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

Safety certification： UL， RoHS compliance.

Explosion-proof rating： Non-explosion-proof design， without built-in safety barrier， only applicable to non-flammable and non-explosive areas.

VII. Structural Design

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

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

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

Back terminal block： Partitioned layout， clearly dividing dual-channel sensor input terminals， 2-channel relay alarm terminals， power terminals， and system communication interfaces. The markings are clear， the wiring is neat， and it is convenient for wiring， inspection， and maintenance.

Hot-swappable design： The module and the backplane of the rack use gold-plated connectors， with reliable contact， supporting online insertion and removal. Replacing the module does not require shutting down the entire TSI system， reducing the impact of maintenance on the operation of the unit.

Six. System Compatibility

Hardware compatibility

Rack and power supply： Perfectly compatible with 3300 series standard 19-inch rack， system power module， and system monitoring module. Functional modules such as vibration， displacement， and speed for the same series can be mixed and installed to work collaboratively.

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 re-calibration.

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

Software compatibility

Configuration software： Compatible with 3300 series dedicated configuration software， supporting remote parameter configuration， alarm logic editing， filtering settings， and firmware upgrade.

Monitoring software： Compatible with System 1 equipment status monitoring software， enabling real-time vibration data collection， trend analysis， fault record storage， report generation， and remote access， supporting the full lifecycle management of equipment. General Industry: For low-speed large-scale rotating machinery (grinding mills, fans, pump sets) in industries such as cement, papermaking, and water treatment, implement online monitoring of the absolute vibration of the shell, low-frequency fault diagnosis, and safety interlock protection to extend equipment lifespan and reduce operation and maintenance costs.

VIII. Installation and Maintenance Specifications

Installation Requirements

Frame Installation: Insert the module smoothly into the vacant slot of the 3300 frame, ensure that the gold-plated connector at the rear is fully engaged, tighten the panel screws to prevent loosening.

Sensor Wiring: Connect the Velomitor sensor signal cables to the corresponding input terminals according to the channel number. Ensure the wiring is secure, single-ended grounding of the shielding layer to avoid interference.

Alarm Wiring: Connect the 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 the normal -24V DC power supply is available 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: Install Velomitor sensors vertically or horizontally on the rigid part of the bearing seat, ensuring a tight fit with the shell, cable fixation and protection to avoid vibration wear.

Daily Maintenance

Inspection and Check: Regularly observe the panel display 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 frame slots of dust to ensure good ventilation and cooling, preventing short circuits or poor cooling failures caused by dust accumulation.

Spare Parts Replacement: When replacing modules, sensors, or cables, must use the original Bentley product 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, or areas with combustible gases or dust.

It must be used in conjunction with the original Bentley Velomitor speed sensor (100 mV/in/s). Do not mix with other specifications of sensors; otherwise, it will result in sensitivity mismatch and measurement failure.

The sensor must be installed on the rigid part of the bearing seat, firmly attached, and avoid installation in thin-walled or non-rigid areas to prevent distortion of vibration transmission and increase measurement errors.

Do not privately disassemble the module, modify the internal circuitry, or change the factory-calibrated parameters of the sensor. Illegal operations will cause equipment damage and loss of product warranty rights.

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

Alarm thresholds, delay, etc. must be strictly set according to the unit's process requirements. Improper settings will cause protection failure or frequent false alarms.

The module installation location should be as far as possible from frequency converters, transformers, high-voltage distribution cabinets, etc., which are sources of strong electromagnetic interference, to reduce the impact of external interference on the measurement signal.