Bentley 3300/36-02-02-01-00-00 Dual-Channel Temperature Monitoring Module Detailed Product Description

I. Product Overview

The Bentley 3300/36-02-02-01-00-00 is a dual-channel thermocouple temperature monitoring module within the 3300 series TSI (Turbo Generator Instrumentation) system of Baker Hughes (formerly GE Bentley Nevada). It is specifically designed for large-scale rotating machinery (such as steam turbines, generators, gas turbines, compressors, etc.) in industries like thermal power, nuclear power, petrochemicals, and metallurgy for monitoring the temperatures at critical parts. The module adopts a 19-inch standard rack structure, supports hot-swapping, and can be mixed with other monitoring modules of the 3300 series to share the backplane - 24V DC power supply and system bus; it is compatible with K-type thermocouples, providing high-precision temperature measurement, dual-level alarms, isolated analog output, and comprehensive self-diagnosis functions, in accordance with API 670 standards. It is the core equipment for thermal protection of rotating machinery.

II. Model Coding Rules (3300/36-AA-BB-CC-DD-EE)

3300: Bentley 3300 modular TSI system, unified rack, centralized power supply, hot-swappable architecture.

36: Function code, representing a dual-channel temperature monitoring module, independently monitoring 2 temperature signals.

02: Range code, corresponding to **0–100℃** measurement range, suitable for medium and low temperature monitoring scenarios of conventional bearings, stators, etc.

02: Sensor type and wiring code, compatible with K-type thermocouples, industrial standard high-temperature sensor configuration.

01: Relay configuration code, equipped with 2 SPDT relays, corresponding to the two-level alarms (ALERT and DANGER), for early warning of faults such as open circuit, short circuit, and poor contact.

00: Certification level code, representing general industrial grade certification, suitable for conventional industrial environments.

00: Safety barrier configuration code, representing no built-in safety barrier, only applicable to non-explosion-proof areas.

III. Core Functions

1. Dual-channel High-Precision Temperature Measurement

Independent 2-channel temperature input, each channel compatible with K-type thermocouples, measurement range 0–100℃, covering normal operation and abnormal temperature intervals of rotating machinery critical parts; using high-precision signal conditioning circuits and cold junction compensation technology, measurement accuracy ≤ ±0.5% full scale (25℃), resolution up to 0.1℃, capable of accurately capturing minor temperature changes; real-time monitoring of sensor circuit status, early warning of faults such as open circuit, short circuit, poor contact, etc., suitable for complex industrial site conditions.

2. Dual-Level Alarm and Relay Output

Each channel independently configured with **ALERT** (warning) and **DANGER** (danger) two-level alarm thresholds, configurable through panel local configuration or remote setting, suitable for different equipment temperature protection requirements; equipped with 2 epoxy resin sealed SPDT relays, contact specifications 250V AC/5A, 30V DC/5A, capable of directly driving audible and visual alarms, DCS/PLC interlock circuits, or shutdown protection devices; alarm delay adjustable from 0 to 10 seconds, filtering instantaneous temperature fluctuations, avoiding false alarms; relay status and module operation status are linked, automatically triggering alarms when faults occur, ensuring timely response to abnormalities.

3. On-site Display and Convenient Configuration

The front panel is equipped with an LCD digital display window and multiple status LED indicators, capable of real-time display of 2 temperature measurement values, sensor circuit resistance, alarm thresholds, and fault codes; OK, ALERT, DANGER, BYPASS four groups of LEDs, corresponding to normal operation, warning alarm, danger alarm, and module bypass status, the operating status is clearly visible; Supports button-based on-site configuration, allowing for range calibration, alarm threshold setting, delay parameter adjustment, sensor type matching, cold-end compensation configuration, etc. without the need for an upper computer. The operation is efficient and convenient for debugging.

4. Isolation of analog signal output

Provides 2 isolated buffered analog outputs (1 channel per output), configurable as 4-20mA current signal or 0-10V voltage signal. The output signal is electrically isolated from the power supply and input signal with an intensity of ≥2500V AC, effectively suppressing electromagnetic interference in industrial environments; the output content is the real-time temperature value, which can be connected to recorders, DCS systems or data acquisition platforms for temperature trend analysis, fault tracing and data archiving, supporting equipment status assessment and preventive maintenance.

5. Comprehensive self-diagnosis and fault identification

Continuous 24-hour monitoring of the module's own hardware, sensor circuit, power supply status and signal integrity. It can accurately identify sensor breakage / short circuit, wiring errors, cold-end compensation abnormalities, power fluctuations, module circuit faults, etc.; distinguishes between real temperature anomalies and sensor/circuit faults. The panel LED clearly indicates the fault type, combined with on-site display of fault codes, facilitating rapid troubleshooting and maintenance, reducing the risk of downtime due to faults.

6. System integration and anti-interference capability

Metal shielding shell design, multiple electrical isolation between input, output and power supply circuits, suitable for industrial environments with strong electromagnetic interference such as thermal power, nuclear power, petrochemicals; compatible with 3300 series system bus (Type A), can be connected to the Bentley System 1 equipment status monitoring platform to achieve remote configuration, real-time data transmission, historical trend query, fault warning analysis and other functions, integrating into the enterprise equipment management system; supports seamless connection with DCS, PLC and other third-party systems to meet factory automation integration requirements.

Four. Detailed technical parameters

Measurement parameters

Monitoring channels: 2 independent temperature measurements (compatible with K-type thermocouples)

Sensor type: K-type thermocouple (nickel-chromium - nickel-silicon)

Measurement range: 0–100℃

Measurement accuracy: ≤±0.5% full scale (25℃, typical value)

Resolution: 0.1℃

Input impedance: ≥1MΩ (per channel)

Cold-end compensation: Built-in automatic cold-end compensation, compensation accuracy ±0.5℃

Electrical parameters

Operating power supply: -24V DC (±10%), backplane power supply; supports short-circuit switching - 18V DC

Power consumption: typical 1.5W, maximum ≤3W

Relay output: 2 SPDT (ALERT+DANGER), 250V AC/5A, 30V DC/5A

Analog output: 2 isolated, 4-20mA or 0-10V selectable

Isolation strength: ≥2500V AC between input/output/power supply

Sensor power supply: No external power supply required, compatible with thermocouple passive measurement characteristics

Environmental and mechanical parameters

Operating temperature: 0℃~+65℃ (standard industrial grade)

Storage temperature: -40℃~+85℃

Relative humidity: 5%–95% (no condensation)

Installation method: 19-inch standard rack slot, supports hot swapping

Dimensions: 203mm (height) × 330mm (depth) × 51mm (width)

Weight: approximately 1kg

Protection level: IP20 (compatible with installation environment in control cabinets)

Certifications and compliance

Industry standards: Compliant with API 670 rotating machinery monitoring protection standards

Electromagnetic compatibility: CE certification, compliant with EN 61000-6-2/4

Safety certification: UL certification

Environmental compliance: RoHS directive compliance

Five. Typical application scenarios Electric power industry (thermal power / nuclear power turbine / generator): Monitor bearing temperature, stator winding temperature, core temperature, prevent overheating that leads to bearing burnout, insulation aging, and equipment damage; temperature protection throughout the stages of startup acceleration, normal operation, and shutdown rotation, trigger alarms or interlock shutdown upon exceeding temperature limits.

Petrochemical industry (large-scale process compressors / turbines): Monitor sliding bearing temperature, sealing chamber temperature, adapt to high-temperature, high-pressure, and highly corrosive industrial environments, prevent overheating from causing bearing wear, seal failure, and medium leakage accidents, ensure continuous production.

Metallurgical industry (large-scale transmission turbines / generator sets): Monitor the temperatures of key bearings and equipment shells, dual-level alarm linkage with equipment operation interlock, promptly warn of overheating faults, reduce unplanned shutdown risks, ensure stable operation of the metallurgical process.

Six. Installation and Commissioning Specifications

Installation Requirements

Frame Installation: Push the frame into the vacant slot of the 3300 series frame smoothly, ensure that the rear connectors are fully engaged, tighten the panel fixing screws to avoid loosening and contact failure.

Sensor Wiring: Connect K-type thermocouples according to the module terminal markings for positive and negative poles, select high-temperature-resistant, high-pressure-resistant, and corrosion-resistant industrial environment-resistant cables, single-ended grounding of the shielding layer (on the control cabinet side), avoid circulating interference; when wiring, distinguish positive and negative poles to prevent reverse connection causing measurement errors.

Alarm and Output Wiring: Distinguish ALERT and DANGER relay contacts, connect to the alarm / interlock circuit; connect analog output terminals according to the DCS / recorder interface requirements, confirm the correct signal polarity.

Sensor Installation: The thermocouple probe is tightly attached to the surface of the measured equipment (bearing seat, stator core, etc.), uses thermal conductive glue for fixation, ensures accurate temperature measurement; fix the probe cable firmly to avoid vibration wear or broken wire.

Commissioning Steps

Power-on Self-Test: After module power-on, automatically perform self-test, the OK light is constantly on indicating normal hardware, when the fault light is on, troubleshoot wiring or hardware issues.

Sensor Calibration: Enter calibration mode through the panel buttons, select K-type thermocouple type, enable automatic cold junction compensation, calibrate the temperature correspondence, ensure measurement accuracy.

Alarm Settings: According to the equipment operation standards, set warning thresholds (such as 80°C) and dangerous thresholds (such as 95°C), adjust alarm delay (such as 2 seconds), save parameters.

Signal Verification: During equipment operation, observe whether the 2-channel temperature values on the panel are stable, without jumps, drifts; check that the sensor circuit has no fault indication, confirm the signal is correct before putting it into operation.

Maintenance and Fault Troubleshooting

Daily Maintenance

Regular Inspection: Daily observation of panel temperature values, circuit status, and LED status, confirm no alarms or fault indications; check that module terminal connections are not loose or oxidized, the frame ventilation and heat dissipation are good.

Annual Calibration: Use a standard temperature source to calibrate temperature measurement accuracy, verify the accuracy of relay alarm action values and delay, ensure monitoring and protection functions are reliable.

Cleaning and Protection: Regularly clean the module surface dust with a dry soft cloth to avoid dust accumulation affecting heat dissipation; strictly prohibit liquids and metal debris from entering the module interior.

Common Fault Troubleshooting

OK Light Goes Out (Module Failure): Check if the backplane power supply is normal (-24V DC), reinsert and re-execute the module, still abnormal then replace the module.

Temperature Display Abnormal (Jumps / Drifts): Check if the K-type thermocouple wiring is loose, positive and negative pole connection is reversed, broken, the compensation wire is suitable, re-wire or replace the sensor; check if the environmental temperature is beyond the working range, if there is strong electromagnetic interference.

No Temperature Display: Check if the sensor is damaged, wiring is incorrect, the cold junction compensation of the module is abnormal, and troubleshoot and replace faulty components. Alarm Mis-triggered: Re-calibrate the alarm threshold and delay parameters, check if the temperature signal is interfered with, and optimize the sensor installation and wiring shielding measures.

VIII. Usage Notes

This model is of non-explosion-proof design. Installation and use are strictly prohibited in flammable and explosive hazardous areas.

It must be equipped with a K-type thermocouple temperature sensor. It is not allowed to use other types of sensors (such as Pt100, Cu50, other types of thermocouples) interchangeably. Otherwise, it will cause measurement errors or equipment damage.

It is only applicable for routine industrial environment temperature monitoring within 0–100℃. For over-temperature scenarios, corresponding range modules should be selected.

It is strictly forbidden to disassemble the module, modify the internal circuitry, or replace non-original accessories without authorization. Illegal operations will result in the invalidation of equipment warranty and may also cause safety hazards.

Before connecting the wiring or conducting maintenance, the main power supply of the frame must be cut off to prevent short circuits and electric shock accidents; it is strictly prohibited to plug or unplug the module while it is powered on.

When the module is in a long-term idle state, it is recommended to remove it from the frame and store it in a dry and cool environment to avoid moisture and dust affecting performance.