Bentley 3300/30-02-02-01-00-00 Six-Channel Temperature Monitoring Module Detailed Product Description

I. Product Overview

The Bentley 3300/30-02-02-01-00-00 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), specifically designed for online monitoring of critical parts of large rotating machinery (such as steam turbines, gas turbines, generators, compressors, fans, pump sets, etc.) in industries such as thermal power, nuclear power, petrochemicals, and metallurgy. The module is installed in a 19-inch standard rack and supports hot-swapping. It can be mixed with other modules of the 3300 series and shares the backplane - 24V DC power supply and system bus; it is compatible with PT100 platinum resistors, with a measurement range of -50℃ to +200℃, providing six independent temperature measurements, dual-level alarms, single-channel relay output, no analog output, and complete self-diagnosis functions, in accordance with API 670 standards. It is a core device for monitoring the low to medium temperature states of rotating machinery and providing fault early warning.

II. Model Coding Rules (3300/30-AA-BB-CC-DD-EE-FF)

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

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

02: Range code, corresponding to **-50℃ to +200℃** measurement range, suitable for PT100 platinum resistors for low to medium temperature sections, covering bearing, winding, lubricating oil, medium, shell, etc. low-temperature measurement points.

02: Sensor type code, suitable for PT100 platinum resistors (RTD), an industrial general-purpose low to medium temperature temperature measurement configuration.

01: Relay configuration code, single-channel alarm relay output, used for hazardous-level alarms or interlock protection.

00: Analog output configuration code, no analog output, simplifying the circuit to enhance stability.

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

III. Core Functions

1. Six-channel PT100 platinum resistance high-precision temperature measurement

Independent 6 RTD inputs, each adapted to PT100 platinum resistors, with a measurement range of **-50℃ to +200℃**, covering the normal operation and abnormal overheating intervals of rotating machinery at low to medium temperatures. Using high-precision constant current sources and signal conditioning technology, the measurement accuracy is ≤ ±0.2℃ (reference point at 25℃, typical value), resolution 0.1℃, response time ≤ 2 seconds (reaching 90% stable reading), capable of accurately capturing small temperature changes in the low to medium temperature range. Real-time monitoring of RTD circuit status, providing early warnings of broken wires, short circuits, incorrect wiring, cable damage, etc., suitable for industrial environments with strong electromagnetic interference, severe vibration, and humid dust.

2. Programmable dual-level alarms, single-channel relay output

Each channel is independently configured with warning (ALERT) and danger (DANGER) two-level alarm thresholds, which can be set locally on the panel or remotely, adapting to the low-temperature protection requirements of different equipment. Alarm delay 0–10 seconds adjustable, filtering instantaneous temperature fluctuations to avoid false alarms. This model is configured with a single sealed relay, corresponding only to the danger-level alarm output, contact capacity meeting industrial interlock requirements, directly accessible to DCS, PLC or shutdown protection circuits, achieving over-temperature interlock protection; no analog output, focusing on medium-low temperature monitoring + alarm interlock + data upload, simplifying circuit design, enhancing stability in harsh environments. Through the 3300 series system bus, 6 channels of real-time temperature data, alarm status, and fault information can be uploaded to the Bently System 1 platform, enabling remote monitoring and data management.

3. Local display and convenient configuration

The front panel is equipped with an LCD digital display window and multiple status LED indicators (OK, ALERT, DANGER, BYPASS), which can display the real-time temperature measurement values, RTD circuit resistance, alarm thresholds, and fault codes. The operating status is clearly visible. It supports on-site configuration via buttons, allowing for range calibration, RTD type matching, circuit resistance calibration, alarm threshold configuration, delay parameter adjustment, and loop diagnosis settings without the need for an upper computer. The debugging is efficient and convenient, reducing the difficulty of on-site maintenance.

4. Comprehensive self-diagnosis and fault identification

The 24-hour continuous monitoring module continuously monitors the hardware of the module, RTD circuits, power supply status, and signal integrity. It can accurately identify issues such as RTD open/closed circuit, wiring errors, abnormal circuit resistance, power fluctuations, module circuit faults, etc. The panel LED clearly indicates the type of fault, and in combination with the local display of the fault code, it facilitates quick troubleshooting and maintenance, reducing the risk of unplanned shutdowns caused by medium and low temperature faults.

5. System integration and strong anti-interference capability

The metal shielding shell design, multiple electrical isolation between input, output, and power supply circuits, with an insulation strength of ≥ 2500V AC, is suitable for industrial environments with strong electromagnetic interference, high vibration, and humid dusty conditions. It is compatible with the 3300 series system bus (type A), can be connected to the Bently System 1 equipment status monitoring platform, enabling remote configuration, real-time data transmission, historical trend query, fault warning analysis, data recording, and report generation. It supports interfacing with third-party systems such as DCS, PLC, and SCADA through the bus protocol, integrating into the enterprise equipment management system to ensure stable transmission of temperature monitoring data.

Four. Detailed technical parameters

Measurement parameters

Monitoring channels: 6 independent temperature measurements (compatible with PT100 platinum resistance)

Sensor type: PT100 platinum resistance (RTD, three-wire system)

Measurement range: -50℃ to +200℃

Measurement accuracy: ≤ ±0.2℃ (25℃ reference point, typical value)

Resolution: 0.1℃

Circuit excitation: Constant current excitation (0.5mA per channel)

Response time: ≤ 2 seconds (reaching 90% stable reading)

Input impedance: ≥ 10MΩ (per channel)

Electrical parameters

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

Power consumption: typical 3.5W, maximum ≤ 4.5W

Relay output: 1 SPDT sealed relay (danger alarm), contact capacity 2A/24V DC

Analog output: None

Isolation strength: Input / power supply ≥ 2500V AC; input / output ≥ 1500V AC

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

Environmental and mechanical parameters

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

Storage temperature: -40℃ to +85℃

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

Vibration tolerance: Compliant 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 0.85kg

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

Certification and compliance Industry standard: 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 turbine / generator): Multi-point monitoring of low-temperature bearing temperatures of turbines, low-temperature winding temperatures of generators' stators, low-temperature sections of lubricating oil, sealing oil temperatures, and auxiliary equipment shell temperatures, covering the low-temperature to medium-temperature range, monitoring throughout the start-up, operation, and shutdown stages, triggering alarms and interlocks for over-temperature conditions, ensuring safe and stable operation of the units.

Petrochemical industry (large compressors / pump sets / storage tanks): Synchronous monitoring of low-temperature bearing temperatures of compressors, low-temperature sections of process media, tank wall temperatures, and bearing temperatures of conveying pumps, suitable for harsh industrial environments such as low temperatures, humidity, and dust, preventing abnormal low temperatures or overheating that may cause equipment failures and production interruptions, ensuring continuous industrial production.

Metallurgical industry (large motors / fans / cooling equipment): Batch monitoring of low-temperature winding temperatures of motors, bearing temperatures of fans, cooling medium temperatures, and low-temperature measurement points of equipment shells, providing early warnings for abnormal low temperatures or overheating faults, reducing the risk of unplanned shutdowns, and ensuring stable and efficient operation of the metallurgical process.

Other industrial fields (large gas turbines / low-temperature pump sets / auxiliary equipment): Suitable for monitoring the low-temperature to medium-temperature temperature requirements of various large rotating machinery and key equipment, providing high-precision data acquisition, reliable alarm interlocks, and system integration capabilities, supporting equipment condition assessment, predictive maintenance, and safe production.

VI. Installation and Commissioning Specifications

Installation Requirements

Frame Installation: Push the frame smoothly into the vacant slot of the 3300 series frame, ensure that the rear connectors are fully engaged, tighten the panel fixing screws to avoid loosening and contact issues; reserve ventilation space at the installation location to avoid heat accumulation affecting module heat dissipation.

Sensor Wiring: PT100 platinum resistors use three-wire connection, distinguish the common terminal and resistance terminal, use dedicated RTD shielded cables, single-ended grounding of the shield layer (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: RTD probes are tightly attached to the surface of the measured equipment, fixed using a dedicated fixture to ensure accurate temperature measurement; the probe cables are securely fixed to avoid vibration wear or breakage, away from strong electromagnetic radiation sources; probes in low-temperature environments should be protected against moisture.

Relay Wiring: Distinguish the common terminal, normally open contacts, and normally closed contacts of the relay, connect according to the hazard alarm interlock logic, tighten the terminals to avoid false connections or short circuits.

Commissioning Steps

Power-on Self-Test: The module automatically performs self-checking after power-on, a normal OK light indicates normal hardware, when the fault light is on, troubleshoot the wiring, sensors, or hardware issues.

Sensor Calibration: Enter the calibration mode through the panel buttons, select PT100 RTD type, calibrate the circuit resistance to ensure temperature measurement accuracy.

Alarm Settings: Based on the equipment operation standards, set warning thresholds (such as 120°C) and danger thresholds (such as 180°C), adjust the alarm delay (such as 2 seconds), save parameters.

Signal Verification: During equipment operation, observe whether the 6-channel temperature values on the panel are stable, without jumps, drifts; check that the RTD circuit has no fault indications, test that the dangerous relay alarm actions are normal before putting 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, oxidized, or damp, and the frame has good ventilation and heat dissipation. Annual Calibration: Use a standard PT100 calibration device to calibrate the temperature measurement accuracy every year, verify the action values and delay accuracy of the hazardous relays, and ensure the reliability of monitoring and interlock functions.

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

Common Fault Troubleshooting

OK light goes out (module failure): Check the backplane - ensure the 24V DC power supply is normal, reinsert and re-execute the module, if still abnormal, replace the module.

Abnormal temperature display (jumping / drift): Check if the PT100 wiring is loose, wrongly connected, broken, or damp, and if the cables are damaged. Reconnect the wiring or replace the sensor; check if the environmental temperature is beyond the working range and if there is strong electromagnetic interference.

No temperature display: Check if the RTD is damaged, if the three-wire connection is incorrect, if the cables are broken, and if the fault components need to be replaced.

Alarm triggered wrongly: Re-calibrate the alarm threshold and delay parameters, check if the circuit resistance is abnormal, optimize the installation and wiring shielding, and moisture-proof measures of the sensor.

Hazardous relay does not act: Check if the relay wiring is correct, if the contacts are damaged, test if the coil power supply is normal, and check and replace the faulty relay.

VIII. Usage Precautions

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

It must be paired with **PT100 platinum resistance (three-wire system)** and dedicated RTD shielding cables. Mixing with thermocouples or other types of RTD is not allowed, otherwise it will cause measurement errors or equipment damage.

It is only applicable for temperature monitoring within -50℃ to +200℃. For over-temperature scenarios, select the corresponding range module.

Do not 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 cause safety hazards.

Before connecting or inspecting the module, cut off the main power supply of the frame to prevent short circuits and electric shock accidents; do not plug or unplug the module while it is powered on.

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