Bentley 3300/35-11-01-01-00-00 Six-Channel Temperature Monitoring Module Detailed Product Description

I. Product Overview

The Bentley 3300/35-11-01-01-00-00 is a six-channel 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 multi-point temperature monitoring. The module adopts a 19-inch standard rack structure, supports hot swapping, and can be mixed with other monitoring modules of the 3300 series, sharing the backplane - 24V DC power supply and system bus; it is compatible with 3-wire Pt100 platinum resistance, providing high-precision multi-channel temperature measurement, dual-level alarm, isolated analog output, and comprehensive self-diagnosis functions, in accordance with API 670 standards. It is the core equipment for multi-point thermal protection of rotating machinery. 

II. Model Coding Rules (3300/35 - AA - BB - CC - DD - EE)

3300: The 3300 series modular TSI system of Bently, featuring a unified rack, centralized power supply, and hot-swappable architecture.

35: Function code, representing a six-channel temperature monitoring module, independently monitoring 6 temperature signals.

11: Range code, corresponding to the measurement range of **-50~+200℃**, suitable for monitoring multiple measurement points at low and medium temperatures in scenarios such as bearings, stators, and sealing chambers.

01: Sensor type and wiring code, compatible with 3-wire Pt100 platinum resistance, an industrial standard high-precision low-temperature sensor configuration.

01: Relay configuration code, equipped with dual SPDT relays, corresponding to two levels of alarms (ALERT and DANGER) for early warning of faults (short circuits, poor contact, etc.).

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

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

III. Core Functions

1. Six-channel high-precision temperature measurement

Independent 6-channel temperature input, each channel compatible with 3-wire Pt100 platinum resistance, measurement range **-50~+200℃**, covering normal operation and abnormal temperature intervals of critical parts of rotating machinery; using high-precision signal conditioning circuits and constant current excitation technology, measurement accuracy ≤ ±0.1% full scale (25℃), resolution up to 0.1℃, capable of accurately capturing minute temperature changes; real-time monitoring of sensor circuit status, early warning of broken wires, short circuits, 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 6 temperature measurement values, sensor circuit resistance, alarm thresholds, and fault codes; 4 groups of LEDs, OK, ALERT, DANGER, BYPASS, corresponding to normal operation, warning alarm, danger alarm, and module bypass status, the operating status is clearly visible; supports key-based on-site configuration, without the need for an upper computer to complete range calibration, alarm threshold setting, delay parameter adjustment, sensor type matching, etc., debugging is efficient and convenient.

4. Isolated analog signal output

Provides 6 isolated buffered analog outputs (1 output per channel), configurable to select 4-20mA current signal or 0-10V voltage signal, output signal and power supply, input signal electrical isolation strength ≥ 2500V AC, effectively suppressing industrial site electromagnetic interference; output content is real-time temperature values, can be connected to recorders, DCS systems or data acquisition platforms, for temperature trend analysis, fault traceability, and data archiving, supporting equipment status assessment and preventive maintenance.

5. Comprehensive self-diagnosis and fault identification The 24-hour uninterrupted monitoring module continuously monitors its own hardware, sensor circuits, power supply status, and signal integrity, accurately identifying issues such as sensor breakage / short circuit, wiring errors, power fluctuations, and module circuit faults; distinguishing between real temperature anomalies and sensor/circuit faults. The panel LED clearly indicates the type of fault, along with on-site display of fault codes, facilitating rapid troubleshooting and maintenance, thereby reducing the risk of downtime due to faults.

6. System Integration and Anti-interference Capability

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

IV. Detailed Technical Parameters

Measurement Parameters

Monitoring Channels: 6 independent temperature measurements (compatible with 3-wire Pt100 platinum resistance)

Sensor Type: 3-wire Pt100 platinum resistance (resistance at 0°C is 100Ω)

Measurement Range: -50~+200°C

Measurement Accuracy: ≤±0.1% of full scale (25°C, typical value)

Resolution: 0.1°C

Input Impedance: ≥1MΩ (per channel)

Excitation Current: Constant 1mA per channel to ensure measurement stability

Electrical Parameters

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

Power Consumption: Typical 2W, maximum ≤4W

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

Analog Output: 6 isolated, 4–20mA or 0–10V selectable

Isolation Strength: ≥2500V AC between input/output/power

Sensor Power Supply: Internal constant current excitation of the module, no external power supply required

Environmental and Mechanical Parameters

Operating Temperature: 0°C~+65°C (standard industrial grade)

Storage Temperature: -40°C~+85°C

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

Installation Method: 19-inch standard rack slot, hot-swappable

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

Weight: Approximately 1.2kg

Protection Grade: IP20 (suitable for installation in control cabinets)

Certifications and Compliance

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

Electromagnetic Compatibility: CE Certification, compliant with EN 61000-6-2/4

Safety Certification: UL Certification

Environmental Compliance: RoHS Directive Compliance

V. Typical Application Scenarios

Power Industry (Thermal Power / Nuclear Power Turbines / Generators): Monitoring bearing temperatures, stator winding temperatures, core temperatures, and sealing oil temperatures at multiple measurement points to prevent overheating at multiple points leading to bearing burnout, insulation aging, and equipment damage; temperature protection during startup acceleration, normal operation, and shutdown rotation throughout the process, triggering alarms or interlock shutdown upon over-temperature.

Petrochemical Industry (Large-scale Process Compressors / Turbines): Synchronous monitoring of multiple sliding bearing temperatures, sealing chamber temperatures, and lubricating oil temperatures, suitable for high-temperature, high-pressure, and highly corrosive industrial environments to prevent overheating at multiple points causing bearing wear, seal failure, and medium leakage, ensuring continuous production. Metallurgical Industry (Large Turbomachinery / Generator Sets): Batch monitoring of critical bearings, equipment housings, and cooling medium temperatures. Dual-level alarm linkage with equipment operation interlocks to promptly warn of multi-point overheating faults, reducing unplanned downtime risks, and ensuring stable operation of the metallurgical process.

VI. 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 3-wire Pt100 platinum resistors according to the module terminal markings, select high-temperature-resistant shielded cables, single-ended grounding on the control cabinet side (for the control cabinet side), to avoid circulating interference; when wiring, distinguish the three wires to prevent incorrect connection causing measurement errors.

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

Sensor Installation: The platinum resistance probe should be closely attached to the surface of the measured equipment (bearing seat, stator core, etc.), use thermal conductive glue for fixation, ensure accurate temperature measurement; fix the probe cable firmly to avoid vibration wear or broken wires.

Commissioning Steps

Power-on Self-Test: After module power-on, it automatically performs self-check. The OK light is constantly on, indicating normal hardware; when the fault light is on, troubleshoot the wiring or hardware issues.

Sensor Calibration: Enter the calibration mode through the panel buttons, select 3-wire Pt100 type, calibrate the temperature-resistance relationship to ensure measurement accuracy.

Alarm Settings: According to the equipment operation standards, set the warning threshold (e.g., 120°C) and the danger threshold (e.g., 180°C), adjust the alarm delay (e.g., 2 seconds), and save the parameters.

Signal Verification: During equipment operation, observe whether the 6-channel temperature values on the panel are stable, without jumps, drifts; check that the sensor circuit has no fault indications, confirm the signal is correct, and then put it into operation.

VII. Maintenance and Fault Troubleshooting

Daily Maintenance

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

Annual Calibration: Use a standard temperature source to calibrate the temperature measurement accuracy every year, verify the alarm action values and delay accuracy of the relays, ensuring reliable monitoring and protection functions.

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 Pt100 wiring is loose, the wire connection is incorrect, or the shielded cable is damaged, rewire or replace the sensor; check if the environmental temperature is beyond the working range or if there is strong electromagnetic interference.

No Temperature Display: Check if the sensor is damaged, the wiring is incorrect, if the module constant current excitation is abnormal, and troubleshoot and replace the faulty components.

Alarm Mis-triggered: Re-calibrate the alarm threshold and delay parameters, check if the temperature signal is interfered with, optimize the sensor installation and wiring shielding measures.

VIII. Usage Precautions

This model is of non-explosion-proof design. It is strictly prohibited to install and use in flammable and explosive hazardous areas.

It must be equipped with 3-wire Pt100 platinum resistance temperature sensors, and other types of sensors (such as K-type thermocouple, Cu50) must not be mixed; otherwise, it will cause measurement errors or equipment damage.

It is only applicable for temperature monitoring in the range of -50 to +200°C. For over-temperature scenarios, select the corresponding range module. It is strictly prohibited to disassemble the module privately, modify the internal circuitry or replace non-original accessories. Any violation of this rule will result in the invalidation of the equipment warranty and may also cause safety hazards.

Before connecting the module 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 forbidden to plug or unplug the module while it is powered on.

When the equipment is to be shut down for a long time, it is recommended to remove the module from the frame and store it in a dry and cool environment to avoid moisture and dust accumulation that may affect performance.