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

I. Product Overview

The Bentley 3300/30-01-02-02-00-00 is a six-channel RTD (platinum resistance) temperature monitoring module of the 3300 series TSI (turbo-generator monitoring instrument) system from Baker Hughes (formerly GE Bentley Nevada). It is designed for online monitoring and protection of the critical low-temperature sections 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 +100℃**, providing six independent temperature measurements, dual-level alarms, dual-channel relay outputs, no analog output, and complete self-diagnosis functions, in accordance with API 670 standards. It is the core equipment for monitoring the state of the low-temperature section of rotating machinery, fault warning, and interlock protection.

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

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.

01: Range code, corresponding to **-50℃ to +100℃** measurement range, suitable for PT100 platinum resistors in the low-temperature section, covering bearing, winding, lubricating oil, sealing oil, shell, etc. low-temperature measurement points.

02: Sensor type code, suitable for PT100 platinum resistors (RTD, three-wire system), an industrial general low-temperature temperature measurement configuration.

02: Relay configuration code, dual-channel sealed alarm relay output, corresponding to warning and danger levels of two alarms, suitable for harsh working conditions.

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 conventional indoor control cabinets environments.

III. Core Functions

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

Independent 6 RTD inputs, each adapted to PT100 platinum resistors (three-wire system), with a measurement range of **-50℃ to +100℃**, accurately covering the normal operation and abnormal overheating intervals of rotating machinery. 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 capturing small temperature fluctuations in the low-temperature section. Real-time monitoring of RTD circuit status, early warning of wire breakage, short circuit, wiring errors, cable damage, etc., suitable for complex working conditions with strong electromagnetic interference, severe vibration, and damp dust.

2. Programmable dual-level alarms, dual-channel sealed relay outputs

Each channel independently configured with warning (ALERT) and danger (DANGER) two-level alarm thresholds, which can be set on-site via panel or remotely, suitable for different 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 dual-channel sealed relays, corresponding to warning and danger two-level alarm outputs, contact capacity meeting industrial interlock requirements, directly accessible to DCS, PLC or shutdown protection circuits, achieving hierarchical alarm and over-temperature interlock protection; Without analog output, the core features include low-temperature monitoring, dual-level alarm, interlock protection, and data upload. The circuit design is simplified, enhancing the operational stability in harsh environments. Through the 3300 series system bus, 6 real-time temperature data, alarm status, and fault information can be uploaded to the BTL System 1 platform for 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 key operation, 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 monitors its own hardware, RTD circuit, power supply status, and signal integrity. It can accurately identify RTD open circuit / short circuit, wiring errors, abnormal circuit resistance, power fluctuations, module circuit faults, etc. The panel LED clearly indicates the fault type, and the fault code is displayed locally for quick troubleshooting and maintenance, reducing the risk of unplanned shutdown due to 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, insulation strength ≥ 2500V AC, is suitable for industrial environments with strong electromagnetic interference, high vibration, and humid dust. It is compatible with the 3300 series system bus (type A), can be connected to the BTL 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 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 +100℃

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: 2 SPDT sealed relays (warning + 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 (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 turbine / generator): Monitor low-temperature bearings of steam turbines, stator low-temperature windings of generators, low-temperature sections of lubricating oil, sealing oil temperature, and auxiliary equipment shell temperatures at multiple measurement points, covering the low-temperature range, monitoring during startup, operation, and shutdown stages, triggering graded alarms and interlocks for over-temperature conditions, ensuring safe and stable operation of the unit.

Petrochemical industry (large compressors / pump sets / storage tanks): Simultaneously monitor low-temperature bearings 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 from causing equipment failures and production interruptions, ensuring continuous industrial production.

Metallurgical industry (large motors / fans / cooling equipment): Batch monitor low-temperature windings of motors, bearings 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): Adapt to the low-temperature section temperature monitoring requirements of various large rotating machinery and key equipment, providing high-precision data acquisition, reliable dual-level 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 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 failure; 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,配套专用 RTD shielding cables， single-ended grounding of the shielding 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 cable is firmly 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 logic of warning， danger alarm， and interlock， tighten the terminals， and eliminate false connections and short circuits.

Commissioning Steps

Power-on self-check： The module automatically performs self-check after power-on， the OK light is constantly on indicating 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： According to the equipment operation standards， set warning thresholds (such as 80°C) and danger thresholds (such as 95°C)， adjust the alarm delay (such as 2 seconds)， 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 RTD circuit has no fault indication， test the action of the warning and danger relays normally， and then put it into operation. Regular inspection: Daily observation of panel temperature values, circuit status and LED status, confirming no alarms or fault indications; checking that module terminal connections are not loose, oxidized or damp, and that the rack ventilation and cooling are adequate.

Annual calibration: Using a standard PT100 calibration device to calibrate temperature measurement accuracy, verifying the accuracy of warning and danger relay action values and delay, ensuring reliable monitoring and interlock functions.

Cleaning and protection: Regularly cleaning module surface dust with a dry soft cloth to avoid dust accumulation affecting heat dissipation; strictly prohibiting liquids, metal debris from entering the module interior to prevent short-circuit faults; regularly checking shielding performance in harsh environments.

Common fault troubleshooting

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

Abnormal temperature display (jumps / drifts): Check if the PT100 wiring is loose, wrongly connected, broken, or damp, and if the cables are damaged. Reconnect 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 check and replace the faulty components.

Alarm mis-triggering: 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.

Relay does not actuate: 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 cable. 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 in the range of -50℃ to +100℃. For over-temperature scenarios, select the corresponding range module.

It is strictly prohibited to 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 inspecting the module, the main power supply of the rack must be cut off 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 rack, store it in a dry and cool environment to avoid moisture and dust affecting performance.