Bentley 3300/35-02-01-00-00-00-00 Six-Channel RTD Temperature Monitoring Module Detailed Product Description

I. Product Overview

The Bentley 3300/35-02-01-00-00-00 is a six-channel RTD (platinum resistance) temperature monitoring module of the 3300 series TSI (turbo-generator monitoring instrument) system developed by Baker Hughes (formerly GE Bentley Nevada). It is specifically designed for large-scale rotating machinery (such as steam turbines, gas turbines, generators, compressors, etc.) in the power generation, nuclear power, petrochemical, and metallurgical industries for high-precision temperature monitoring at low-temperature measurement points. The module is installed in a 19-inch standard rack and supports hot-swapping. It can be mixed with other monitoring modules of the 3300 series and shares the backplane - 24V DC power supply and system bus; it is compatible with Pt100 RTD, with a measurement range of 0–600°C, providing six independent temperature measurements, no relay output, no analog output, and only data transmission through the system bus. It has a complete self-diagnosis function, complies with API 670 standards, and is the core equipment for basic temperature monitoring and data acquisition of rotating machinery.

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

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

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

02: Range code, corresponding to the measurement range of **0–600°C**, suitable for the high-temperature section of Pt100 RTD, covering bearing, winding, lubricating oil, sealing cavity, etc. as low-temperature measurement points.

01: Sensor type code, suitable for Pt100 RTD (platinum resistance), an industrial general-purpose low-temperature temperature measurement configuration.

00: Relay configuration code, no relay output, only retaining monitoring and bus communication functions.

00: Output configuration code, no analog output, data only transmitted through the system bus.

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

III. Core Functions

1. Six-channel high-precision Pt100 RTD temperature measurement

Independent 6 RTD inputs, each adapted to Pt100 platinum resistance (three-wire system, IEC 751 standard), measurement range 0–600°C, covering normal operation and abnormal overheating intervals of rotating machinery bearings, windings, lubricating oil, sealing cavities, etc. High-precision constant current source excitation and signal conditioning technology is adopted, measurement accuracy ≤ ±0.1°C (25°C reference point), resolution up to 0.1°C, capable of accurately capturing small temperature changes in the low-temperature range. Real-time monitoring of RTD circuit status, early warning of broken wires, short circuits, incorrect wiring, cable damage, etc., suitable for complex industrial environments with strong electromagnetic interference and severe vibration.

2. No relay output and analog output, focused on pure data acquisition

This model has no relay output, no analog output, the core focuses on six high-precision temperature monitoring + bus data upload, simplifying the hardware circuit, improving operational stability, suitable for scenarios that only require temperature data acquisition and do not need local alarm and signal remote transmission. Through the 3300 series system bus, 6 temperature real-time data, circuit status, fault information can be uploaded to the Bentley System 1 platform, enabling remote monitoring, data recording and trend analysis, meeting basic monitoring and data management requirements.

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, RTD circuit resistance and fault codes. OK, BYPASS two groups of LED, respectively corresponding to normal operation and module bypass states, the operating status can be clearly seen. It supports on-site configuration via buttons, without the need for an upper computer to complete range calibration, RTD type matching, loop resistance calibration, loop diagnosis settings, etc. The debugging is efficient and convenient, reducing the difficulty of on-site maintenance.

4. Comprehensive self-diagnosis and fault identification

24-hour continuous monitoring of the module's own hardware, RTD circuit, power supply status and signal integrity. It can accurately identify RTD open circuit / short circuit, wiring errors, power fluctuations, module circuit faults, etc. It distinguishes between real temperature anomalies and sensor / circuit faults. The panel LED clearly indicates the fault type, and in combination with on-site display of fault codes, it facilitates rapid troubleshooting and maintenance, reducing the risk of monitoring failure due to sensor faults.

5. System integration and strong anti-interference capability

Metal shielding shell design, multiple electrical isolation between input and power supply circuits. Suitable for industrial environments with strong electromagnetic interference and high vibration 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, etc., integrating into the enterprise equipment management system. Supports connection to third-party systems such as DCS, PLC through bus protocol, meeting factory automation integration requirements, ensuring stable transmission of temperature monitoring data.

Four. Detailed technical parameters

Measurement parameters

Monitoring channels: 6 independent temperature measurement (compatible with Pt100 RTD)

Sensor type: Pt100 platinum resistance (three-wire system, IEC 751 standard)

Measurement range: 0–600℃

Measurement accuracy: ≤±0.1℃ (25℃ reference point, typical value)

Resolution: 0.1℃

Excitation current: 1mA (constant current source, independent for each channel)

Response time: ≤3 seconds (reaching stable reading 90%)

Input impedance: ≥10MΩ (each channel)

Electrical parameters

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

Power consumption: typical 2.8W, maximum ≤4.5W

Relay output: None

Analog output: None

Isolation strength: Input / power supply ≥2500V AC

Sensor power supply: Module internal constant current source excitation, no external power supply required

Environmental and mechanical parameters

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

Storage temperature: -40℃~+85℃

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

Vibration tolerance: Complies with IEC 60068-2 standard, anti-vibration, anti-shock

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

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

Weight: approximately 1.3kg

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

Certification and compliance

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

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

Safety certification: UL certification

Environmental compliance: RoHS directive compliance

Five. Typical application scenarios

Power industry (thermal power / nuclear power turbine / generator): Multi-measurement point monitoring of turbine bearing temperature, generator winding temperature, lubricating oil temperature, sealing oil temperature, etc., real-time collection of temperature data uploaded to System 1 platform, used for equipment status analysis and predictive maintenance, ensuring safe and stable operation of the unit. Petrochemical Industry (Large Compressors / Pump Sets): Simultaneously monitor the bearing temperatures of compressors, the winding temperatures of pump sets, and the temperatures of equipment shells. Suitable for medium and low-temperature, high-vibration industrial environments, providing data support for equipment health assessment to prevent overheating-induced equipment failures and production disruptions.

Metallurgical Industry (Large Motors / Fans): Batch monitor the winding temperatures of motors, the bearing temperatures of fans, and the temperatures of key components. Upload data to the enterprise management system to achieve centralized management and trend analysis of temperature data, reducing the risk of unplanned downtime and ensuring stable and efficient operation of metallurgical processes.

VII. 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; reserve ventilation space at the installation location to avoid heat accumulation affecting module heat dissipation.

Sensor Wiring: Pt100 RTD uses three-wire connection (red, white, black), equipped with a dedicated RTD shielded cable, with the shielded layer grounded at one end (on the control cabinet side), to avoid circulating interference; during wiring, avoid bending or pulling the cables to prevent breakage or signal attenuation.

Sensor Installation: The RTD probe is tightly attached to the surface of the measured equipment, fixed with thermal conductive silicone and a heat-resistant fixture to ensure accurate temperature measurement; the probe cable is firmly fixed to avoid vibration wear or breakage, and keep away from strong electromagnetic radiation sources.

Commissioning Steps

Power-on Self-Test: The module automatically performs self-checking after power-on, with the OK light constantly on indicating normal hardware, and the fault light on when troubleshooting wiring, sensors, or hardware issues.

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

Signal Verification: During equipment operation, observe whether the 6-channel temperature values on the panel are stable without jumps or drifts; check that there are no fault prompts in the RTD circuit, confirm that data upload is normal, and then put it into operation.

VIII. Maintenance and Fault Troubleshooting

Daily Maintenance

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

Annual Calibration: Use standard RTD to calibrate the temperature measurement accuracy every year to ensure accurate and reliable monitoring data.

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

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 RTD wiring is loose, wrongly connected, or broken, and re-wire 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 RTD is damaged, if the three-wire connection is incorrect, if the cable is broken, and troubleshoot and replace the faulty components.

IX. Safety Precautions

This model is not explosion-proof. Do not install or use in flammable and explosive hazardous areas.

Must be equipped with **Pt100 platinum resistance (three-wire, IEC 751 standard)** temperature sensors and dedicated RTD shielded cables. Do not mix with thermocouples (such as K type) or two-wire / four-wire RTD. Otherwise, it will cause measurement errors or equipment damage.

Only applicable for temperature monitoring within 0–600℃. For over-temperature scenarios, select corresponding range modules.

Do not disassemble the module, modify the internal circuitry, or replace non-original accessories. Illegal operations will result in the invalidation of equipment warranty and may cause safety hazards. Before connecting or maintaining the module, 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 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 being affected by moisture and dust and thus losing performance.