Bentley 3300/50-01-01-01-01-00 Speed Monitoring Module Detailed Product Description

I. Product Overview

The Bentley 3300/50-01-01-01-01-00 is a rack-mounted speed monitoring module (Tachometer Monitor) of the 3300 series from Bently Nevada under Baker Hughes. It is specifically designed for continuous online monitoring of the rotational speed, acceleration, and zero-speed status of rotating machinery, following the API 670 standard. It is the core functional module of the state monitoring and protection system for large-scale units. This model is a single-channel dual-input configuration, equipped with built-in voting logic, capable of connecting two speed probe signals, used for speed over-limit alarms, zero-speed detection, and acceleration monitoring of key equipment such as steam turbines, gas turbines, compressors, and generators. It is widely used in the power, petrochemical, and metallurgical industries, providing real-time speed data, fault warnings, and safety interlock signals to ensure the speed safety of the units during start-up, shutdown, and operation.

II. Model Decoding (3300/50-01-01-01-01-00)

3300: Bentley 3300 modular monitoring system, supporting rack-mounted installation, integrated power supply, system monitoring, and various types of monitoring modules;

50: Function code, representing the speed monitoring module (Tachometer Monitor), core monitoring of speed, acceleration, and zero-speed;

The 1st bit 01: Input configuration, dual probe input (dual-channel voting), single module connects two speed probe signals, built-in logical voting, reducing the risk of false alarms due to single probe failure;

The 2nd bit 01: Output configuration, standard analog output + alarm relay, supports voltage/current signal output and alarm contact signal;

The 3rd bit 01: Display and operation, front-mounted analog meter head + LED status indicator, local real-time display of speed value, intuitive viewing of operation/alarm status;

The 4th bit 01: Certification level, basic industrial grade certification (CE), suitable for ordinary non-explosion-proof industrial areas;

The 5th bit 00: Special functions, no additional safety barrier, no explosion-proof, no customized functions, standard basic speed module.

III. Core Functions

Precise speed monitoring: Real-time measurement of the rotational speed of rotating machinery, wide measurement range, high accuracy, covering low-speed to high-speed unit monitoring requirements;

Dual input voting logic: Supports two independent speed probe inputs, built-in intelligent voting, automatic switching when a single probe fails, avoiding false alarms, improving monitoring reliability;

Acceleration and zero-speed detection: Can monitor the rotational acceleration of the shaft, identify speed changes; supports zero-speed detection, used for confirming the shutdown state of the unit and start-up interlock protection;

Local display and status indication: Front-mounted analog meter head displays the speed value in real time, combined with OK (normal), ALERT (warning), DANGER (danger), BYPASS (bypass) LED indicators, local status is clear at a glance;

Standard signal output: Backboard provides isolated analog output (voltage/current), can be connected to DCS, PLC, SCADA, etc.; equipped with alarm relay contacts, achieving over-limit alarm and safety interlock;

Parameters programmable: Measurement range, alarm threshold, zero-speed determination value, acceleration limit value, etc., parameters can be set through system configuration software or local buttons, suitable for different unit requirements.

IV. Technical Parameters

(1) Measurement Parameters

Speed measurement range: 0 - 200,000 RPM (programmable, suitable for high and low-speed units);

Measurement accuracy: ±0.02% reading ±2 counts, long-term stable without drift; Resolution: 0.1 RPM, precisely capturing minute speed variations;

Acceleration monitoring range: 0 - 10,000 RPM/s, capable of identifying sudden speed changes faults;

Zero-speed detection threshold: 0 - 5 RPM (programmable), used for determining the shutdown state.

(II) Electrical Parameters

Power supply: +24VDC (±10%), power consumption ≤ 10W, compatible with 3300 series rack power supply;

Probe input: compatible with Bently 3300 XL series eddy current speed probes (such as 330101, 330102), input signal is pulse/voltage signal;

Analog output: selectable 0 - 10VDC or 4 - 20mA, isolated output, load capacity ≤ 500Ω;

Relay output: ALERT (warning), DANGER (danger) each 1 channel, contact capacity 250VAC/3A, passive dry contact;

Signal isolation: electrical isolation between input/output/power supply, anti-electromagnetic interference, compatible with complex industrial electromagnetic environments.

(III) Environmental and Mechanical Parameters

Operating temperature: -40℃ - +70℃, compatible with high and low temperature industrial environments;

Storage temperature: -40℃ - +85℃;

Relative humidity: 0% - 95% (no condensation), moisture-proof and dew-proof;

Installation method: 3300 series standard rack slot installation, supports hot swapping, easy to install and disassemble;

Size: approximately 330mm × 203mm × 51mm (length × width × height);

Weight: approximately 1.5kg, compact structure, stable rack installation;

Protection level: IP20 (installed in the rack), dust-proof and foreign object prevention.

(IV) Certification and Compliance

Basic certification: CE certification, compliant with electromagnetic compatibility (EMC) standards;

Industry standards: fully compliant with API 670 rotating machinery monitoring standards, compatible with mainstream industrial monitoring scenarios worldwide;

No explosion-proof certification: only applicable to ordinary non-flammable and non-explosive industrial areas, prohibited from use in dangerous explosion-proof scenarios.

V. Structural Design

(1) Rack-based Modular Structure

Adopt 3300 series standard rack adaptation design, can be directly inserted into 3300 system rack slots, supports hot swapping, no need to stop the machine to replace modules, maintenance is convenient. The front panel of the module integrates analog speed indicator head, LED status indicator light and operation keys, the back panel is equipped with probe input terminals, analog output terminals, relay contact terminals and power interface, the layout is clear, wiring is standardized.

(2) Dual Input Voting Circuit

Built-in dual signal conditioning and voting logic circuit, two probe input signals are independently processed, when one signal is abnormal (such as break, out of tolerance), the module automatically identifies and switches to the normal signal, simultaneously triggering fault indication, avoiding false alarms or missed alarms caused by single probe failure.

(3) Isolation and Anti-interference Design

Electrical isolation design between input/output/power supply, built-in electromagnetic shielding layer, effectively resisting EMI/RFI interference generated by frequency converters and high-power motors, compatible with power plants, chemical plants and other strong electromagnetic interference environments, ensuring stable signals and accurate measurements.

VI. System Compatibility

(1) Hardware Compatibility

Compatible with Bently 3300 series system racks, power modules (3300/12, 3300/13) and system monitoring modules (3300/03), seamless integration;

Compatible with Bently 3300 XL series 8mm/11mm eddy current speed probes, no additional adaptation and calibration required;

Can be connected to mainstream industrial control systems such as DCS, PLC, SCADA, through 4 - 20mA or 0 - 10VDC analog signal transmission of speed data; Relay contacts can be directly connected to the safety interlock circuit of the unit to achieve overspeed shutdown protection.

(II) Software Compatibility

Support for Bently System 1 status monitoring software to realize speed data acquisition, trend analysis, fault diagnosis, and historical data storage;

The range, alarm threshold, and voting logic parameters can be configured through the 3300 system configuration software, and the operation is convenient.

VII. Typical Application Scenarios

Power industry: Speed monitoring, zero-speed detection, and start-stop interlock protection for steam turbines, gas turbines, generators, and feedwater pumps in thermal power plants and nuclear power plants;

Petrochemical industry: Overspeed alarm, acceleration sudden change monitoring for centrifugal compressors, process turbines, and large pump groups, suitable for non-explosion-proof production areas;

Metallurgical industry: Speed monitoring and safety protection for blast furnace fans, large drive motors, and rolling mill transmission systems;

General industry: High-speed rotating equipment in papermaking, cement, and other industries, used for confirming the start-stop status of the unit, monitoring speed stability, and fault warning.

VIII. Installation and Maintenance Specifications

(1) Installation Requirements

Frame installation: Insert the module into the vacant slot of the 3300 system frame and ensure a tight and secure connection, with good contact;

Probe wiring: Connect the two speed probes to the corresponding input terminals on the module backplane, ensuring a firm connection and avoiding loosening or short circuits;

Signal output wiring: Connect the analog output terminals to the DCS/PLC input, connect the relay contacts to the alarm/interlock circuit, distinguishing positive and negative poles and contact types;

Power supply connection: Ensure normal power supply for the frame, check the OK indicator light on the front panel after the module powers on, and there should be no fault alarms;

Configuration settings: Set the speed range, warning/danger threshold, and zero-speed determination value through System 1 or 3300 configuration software, and save and apply the settings.

(2) Daily Maintenance

Regular inspection: Check the status of the module panel indicator lights, whether the display is normal, and whether the backplane wiring is loose or oxidized;

Signal verification: Conduct an annual accuracy verification once, connect a standard speed signal, and check the display value against the output signal accuracy to ensure it meets the ±0.02% accuracy requirement;

Cleaning and maintenance: Regularly clean the module surface dust to maintain good ventilation and heat dissipation, avoiding overheating faults caused by dust accumulation;

Spare parts management: Use Bently original modules and probes; non-original components are prone to signal deviation or system failure.

IX. Usage Precautions

Prohibit over-temperature operation: The working temperature should be controlled within -40℃ to +70℃ to avoid aging due to high temperature or failure due to low temperature;

Do not use in explosion-proof areas: This model has no explosion-proof certification; it is strictly prohibited to use in flammable and explosive hazardous environments (such as oil areas, chemical explosion-proof workshops);

Standard wiring for dual probes: Two qualified speed probes must be connected; single connection may result in the failure of the voting logic and increase the risk of false alarms;

Do not modify without authorization: Do not privately change the module circuit, replace non-original components, or disassemble the equipment; otherwise, it will lead to measurement failure, equipment damage, and loss of warranty eligibility;

Power-off operation: When connecting, repairing, or replacing the module, cut off the power supply of the frame to prevent short circuits or electric shock accidents;

Careful parameter setting: The speed range, alarm threshold, etc. should be matched with the design requirements of the unit; setting them too high or too low will result in the failure of protection or false alarms.